The document discusses the classification and evolution of life on Earth, including the origins of different domains and kingdoms, such as Archaea, Eubacteria, Protists, Fungi, Plants, and Animals. It examines theories of evolution like gradualism, catastrophism, and punctuated equilibrium. It also covers classification systems, levels of taxonomy, phylogenetic trees, homologous and analogous structures, inherited traits, and dating methods for fossils.
Classification is the grouping of organisms according to their characteristics. Early systems were developed by Aristotle and John Ray. Linnaeus developed the binomial nomenclature system using genus and species names. Organisms are classified into a hierarchy of taxonomic ranks including kingdom, phylum, class, order, family, genus and species. Dichotomous keys use yes/no questions to identify organisms based on observable traits. The document provides examples of classification systems and guides the reader through creating a simple dichotomous key.
The document discusses the classification and development of plants and animals. It begins by outlining the five kingdoms - Monera, Protist, Fungi, Plant, and Animal. It then describes the hierarchical levels of classification within the kingdoms, from phylum down to species. For plants, it focuses on the development of angiosperm plants, including the seed and growth/differentiation of plants. Primary topics covered are plant classification, seed development, and plant growth through cell division, expansion and differentiation.
The document provides an overview of classification and taxonomy learning objectives, including:
1) Defining the binomial system of naming species and classifying organisms.
2) Describing the five main classes of organisms and their key features.
3) Using dichotomous keys to classify organisms based on observable features.
The document discusses taxonomy, which is the classifying and organizing of living things. It covers the early work of Carl Linnaeus, considered the father of modern taxonomy, including his development of the hierarchical classification system and binomial nomenclature. It also outlines the six kingdoms of life - Archaebacteria, Eubacteria, Protista, Fungi, Plantae, and Animalia - describing key characteristics of each.
Animal Morphology : Animal Classification, Phylogeny and OrganizationTrixie Piloton
This document discusses animal morphology and classification. It covers topics like taxonomy, nomenclature, evolutionary systematics, and levels of biological organization. Key points include:
1) Taxonomy is the study of classifying organisms based on evolutionary relationships and shared characteristics. Nomenclature assigns scientific names.
2) Organisms can be grouped into domains, kingdoms, phyla, classes, orders, families, and species based on evolutionary relationships.
3) Animals display different levels of organization from unicellular to diploblastic to triploblastic structures with tissue and organ systems.
- The document discusses the evolution of biological classification systems from Linnaeus's two-kingdom system to the modern three-domain system. It describes the levels of taxonomy from smallest to largest and characteristics used to classify organisms, including evolutionary relationships revealed by DNA evidence. The three domains are Bacteria, Archaea, and Eukarya, with Eukarya containing the kingdoms Protista, Fungi, Plantae, and Animalia. Classification systems continue adapting to new genetic and molecular evidence.
The document provides an overview of biodiversity and biology concepts including:
1) Biodiversity refers to the variety of life on Earth.
2) Organisms are classified into 3 domains, 6 kingdoms, and further into phyla, classes etc. based on their characteristics and relationships.
3) The domains are Bacteria, Archaea, and Eukarya. Eukarya includes protists, fungi, plants, and animals.
4) Key characteristics distinguish prokaryotic and eukaryotic cells, as well as the domains and kingdoms.
Classification is the grouping of organisms according to their characteristics. Early systems were developed by Aristotle and John Ray. Linnaeus developed the binomial nomenclature system using genus and species names. Organisms are classified into a hierarchy of taxonomic ranks including kingdom, phylum, class, order, family, genus and species. Dichotomous keys use yes/no questions to identify organisms based on observable traits. The document provides examples of classification systems and guides the reader through creating a simple dichotomous key.
The document discusses the classification and development of plants and animals. It begins by outlining the five kingdoms - Monera, Protist, Fungi, Plant, and Animal. It then describes the hierarchical levels of classification within the kingdoms, from phylum down to species. For plants, it focuses on the development of angiosperm plants, including the seed and growth/differentiation of plants. Primary topics covered are plant classification, seed development, and plant growth through cell division, expansion and differentiation.
The document provides an overview of classification and taxonomy learning objectives, including:
1) Defining the binomial system of naming species and classifying organisms.
2) Describing the five main classes of organisms and their key features.
3) Using dichotomous keys to classify organisms based on observable features.
The document discusses taxonomy, which is the classifying and organizing of living things. It covers the early work of Carl Linnaeus, considered the father of modern taxonomy, including his development of the hierarchical classification system and binomial nomenclature. It also outlines the six kingdoms of life - Archaebacteria, Eubacteria, Protista, Fungi, Plantae, and Animalia - describing key characteristics of each.
Animal Morphology : Animal Classification, Phylogeny and OrganizationTrixie Piloton
This document discusses animal morphology and classification. It covers topics like taxonomy, nomenclature, evolutionary systematics, and levels of biological organization. Key points include:
1) Taxonomy is the study of classifying organisms based on evolutionary relationships and shared characteristics. Nomenclature assigns scientific names.
2) Organisms can be grouped into domains, kingdoms, phyla, classes, orders, families, and species based on evolutionary relationships.
3) Animals display different levels of organization from unicellular to diploblastic to triploblastic structures with tissue and organ systems.
- The document discusses the evolution of biological classification systems from Linnaeus's two-kingdom system to the modern three-domain system. It describes the levels of taxonomy from smallest to largest and characteristics used to classify organisms, including evolutionary relationships revealed by DNA evidence. The three domains are Bacteria, Archaea, and Eukarya, with Eukarya containing the kingdoms Protista, Fungi, Plantae, and Animalia. Classification systems continue adapting to new genetic and molecular evidence.
The document provides an overview of biodiversity and biology concepts including:
1) Biodiversity refers to the variety of life on Earth.
2) Organisms are classified into 3 domains, 6 kingdoms, and further into phyla, classes etc. based on their characteristics and relationships.
3) The domains are Bacteria, Archaea, and Eukarya. Eukarya includes protists, fungi, plants, and animals.
4) Key characteristics distinguish prokaryotic and eukaryotic cells, as well as the domains and kingdoms.
IB Biology Option D.2: Species and speciationJason de Nys
1. Speciation occurs through changes in allele frequencies in a population's gene pool over many generations, driven by factors like natural selection, genetic drift, and geographic isolation of populations.
2. Reproductive isolating mechanisms like temporal, ecological, behavioral, and mechanical barriers prevent interbreeding between species and maintain genetic integrity of gene pools.
3. Adaptive radiation and divergent evolution describe how a single ancestral species can evolve into many new species adapted to different ecological niches or environments through natural selection.
1. Species are the fundamental units of biodiversity and are considered natural individuals, not classes.
2. There are many concepts of what constitutes a species, and defining and recognizing species is contentious due to their dynamic evolutionary nature.
3. Species are important units of study as they represent independently evolving lineages and are the primary units of evolution, adaptation, and other biological processes.
This document provides an overview of biological classification and taxonomy. It begins by defining key terms like biosphere, ecosystem, and biodiversity. It then outlines the major kingdoms of life - Archaebacteria, Eubacteria, Protista, Fungi, Plantae, and Animalia. For each kingdom, it describes the cell type, number of cells, nutrition, examples of organisms, and their roles in ecosystems. It also discusses the hierarchical levels of classification from domain to species. The document provides a comprehensive introduction to classifying and organizing life on Earth.
- There are three domains of life: Archaea, Bacteria, and Eukarya. Archaea and bacteria are prokaryotes lacking nuclei and organelles, while eukaryotes have nuclei and membrane-bound organelles.
- Eukaryotes are divided into four kingdoms: Protista, Plantae, Fungi, and Animalia. Protists are microscopic eukaryotes that may be photosynthetic or heterotrophic. Plants are photosynthetic and multicellular. Fungi are heterotrophic and absorb nutrients. Animals are mobile and ingest food.
- Classification systems have evolved over time based on new discoveries. Early systems grouped by visible characteristics,
The document discusses taxonomy and systematics. It defines taxonomy as the original description and naming of species, while systematics is the arrangement of species into evolutionary groups. It describes the historical development of classification systems from Linnaeus' focus on morphology to the modern three domain system based on molecular evidence. The key approaches of evolutionary systematics, numerical taxonomy, and phylogenetic systematics are also summarized.
The document provides information about Earth's spheres, biomes, ecosystems, and natural resources. It discusses the following:
- Earth has four spheres - the geosphere (rocks), hydrosphere (water), atmosphere (air), and biosphere (life).
- Major biomes include aquatic, desert, tundra, grassland, forest (taiga, temperate deciduous, tropical rainforest), and their characteristic climates, soils, plants and animals.
- Ecosystems involve interactions between biotic factors like producers, consumers, decomposers and abiotic factors like the environment. Species interact through food chains, webs and pyramids.
- Natural resources can be
This document provides information on biological classification systems. It discusses taxonomy, systematics, and classification. It describes Turril's three types of taxonomy (alpha, beta, omega). It also summarizes classical and new systematics. The key classification systems discussed are the artificial, natural, and phylogenetic systems. It provides details on Linnaeus' artificial system and Bentham and Hooker's natural system. It concludes with descriptions of the two, three, four, five, and six kingdom classification systems.
Classifiction and Nomenclature of Kingdoms of LifeCyra Mae Soreda
This document discusses the history and principles of taxonomy and biological classification. It begins with definitions of taxonomy, classification, and nomenclature. It then covers the historical development of classification systems from Aristotle to the modern five-kingdom and three-domain systems. Key figures discussed include Linnaeus, Haeckel, Copeland, and Whittaker. The document also outlines taxonomic ranks, important classification features like embryology and body plans, and rules of scientific nomenclature.
This document discusses various topics related to taxonomy and classification of living organisms. It begins by providing examples of common names for plants in different languages that can be confusing. It then introduces binomial nomenclature developed by Carolus Linnaeus to systematically name organisms using genus and species. Rules for naming organisms developed by the International Code of Nomenclature are outlined. The concepts of classification, taxonomy, and systematic are defined and their objectives and components are described. The taxonomic hierarchy from species to kingdom is explained along with examples. Identification aids used in classification are also briefly mentioned.
Principle of classification of living thingsmnyaongo
The document discusses the principles of classification of living things according to Carolus Linnaeus. It provides background on classification systems, including that classification involves grouping organisms based on similarities. It describes Linnaeus' contributions, including establishing a hierarchical classification system with seven main categories (kingdom to species) and developing binomial nomenclature using two-word scientific names. The document also discusses concepts like homology, analogy, taxonomy and challenges in classifying organisms.
This document discusses different types of taxonomic characters that can be used to distinguish between taxa. There are 5 main kinds of characters: morphological, physiological, ecological, ethological, and geographical. Morphological characters include external features, internal structures, larval stages, and karyology. Physiological characters include growth rates and temperature tolerances. Ecological characters include habitat preferences, food sources, and host specificity. Ethological characters include behavioral traits like mating calls. Geographical characters include biogeographic patterns and whether populations are allopatric or sympatric. These various character types provide taxonomic information to differentiate between taxa.
The document discusses the basics of biological classification including:
1) The hierarchical system used to classify organisms from broad domains to specific species. This includes kingdoms being divided into phyla, classes, orders, families, genera and species.
2) Key concepts in classification like taxonomy, phylogeny, and binomial nomenclature which assigns each species a unique two-part scientific name.
3) Methods used to determine evolutionary relationships between organisms like fossils, DNA, morphology and embryology which are represented in phylogenetic trees.
Evolution and Biodiversity,Genetics,Digestive System,EcosystemJenevive Oloroso
This document contains a prayer asking for help with work, concentration, understanding, learning, and a peaceful mind, as well as remembering Jesus. It is a short prayer requesting guidance.
This document provides an overview of taxonomy and the characteristics of living organisms. It discusses the levels of biological organization from atomic to biosphere levels. Key topics covered include the characteristics of living things, metabolic reactions, diversity in the living world, classification systems, and the various taxonomic categories such as species, genus, family, order, class, phylum, and kingdom. The document also examines modern taxonomy approaches and the importance and scope of taxonomy.
Evolution is the study of changes in life forms over generations. The theory of evolution proposes that all species are related and gradually change over time through a process called natural selection. Evidence for evolution comes from fossils showing changes in ancient life forms, comparisons of anatomy and genes between current and extinct species indicating common ancestry, and observations of natural selection leading to new species. Charles Darwin's theory of evolution by natural selection established evolution as the underlying mechanism for the diversity of life.
This document discusses the taxonomy, collection, labeling, identification, and preservation of spider specimens. It provides information on:
1. The definition and significance of taxonomy as it relates to classifying and understanding organisms like spiders.
2. Recommended habitats and techniques for collecting spider specimens, including visual searches, sweep nets, beating vegetation, pitfall traps, and litter sampling.
3. Proper preservation of spider specimens requires storing them in 70-80% alcohol mixed with glycerol to prevent drying.
4. Specimens should be labeled with information like name, location, habitat, date, and collector for identification purposes.
This document provides information about biology and the classification of living organisms. It discusses the following key points:
- Biology is the science of living organisms and life processes. Modern biology integrates with other fields like chemistry and physics.
- Characteristics of living things include growth, reproduction, metabolism, response to stimuli, homeostasis, and evolution.
- Organisms are classified and grouped into a hierarchy of taxa including species, genus, family, order, class, phylum, and kingdom.
- The five kingdom system classifies organisms into Monera, Protista, Fungi, Plantae, and Animalia based on characteristics like cell structure, nutrition, and lifestyle. Examples of groups within each
Cell Structures, Functions And TransportJoshua Grasso
This document summarizes key structures and functions of eukaryotic cells. It describes organelles common to both plant and animal cells like the nucleus, ribosomes, endoplasmic reticulum, Golgi bodies, mitochondria, and cell membrane. It also highlights structures unique to plant cells, including vacuoles for storage, chloroplasts for photosynthesis, and a cell wall for support and protection. The document provides details on the location, appearance and functions of these various organelles to give an overview of eukaryotic cell structures.
Classification of Plants and Animals By SYED AASIM HAQSYED ASSIM HAQ
This document provides an overview of the classification of plants and animals. It discusses the three domain system of classifying all living things and provides details on the classification of major kingdoms of plants and animals. The key plant groups discussed include algae, bryophytes, pteridophytes, gymnosperms and angiosperms. The major animal phyla described are porifera, coelentrata, ctenophora, platyhelminthes, aschelminths, annelids, arthropoda, mollusca, echinodermata, hemichordata, chordata and the classes under chordata.
IB Biology Option D.2: Species and speciationJason de Nys
1. Speciation occurs through changes in allele frequencies in a population's gene pool over many generations, driven by factors like natural selection, genetic drift, and geographic isolation of populations.
2. Reproductive isolating mechanisms like temporal, ecological, behavioral, and mechanical barriers prevent interbreeding between species and maintain genetic integrity of gene pools.
3. Adaptive radiation and divergent evolution describe how a single ancestral species can evolve into many new species adapted to different ecological niches or environments through natural selection.
1. Species are the fundamental units of biodiversity and are considered natural individuals, not classes.
2. There are many concepts of what constitutes a species, and defining and recognizing species is contentious due to their dynamic evolutionary nature.
3. Species are important units of study as they represent independently evolving lineages and are the primary units of evolution, adaptation, and other biological processes.
This document provides an overview of biological classification and taxonomy. It begins by defining key terms like biosphere, ecosystem, and biodiversity. It then outlines the major kingdoms of life - Archaebacteria, Eubacteria, Protista, Fungi, Plantae, and Animalia. For each kingdom, it describes the cell type, number of cells, nutrition, examples of organisms, and their roles in ecosystems. It also discusses the hierarchical levels of classification from domain to species. The document provides a comprehensive introduction to classifying and organizing life on Earth.
- There are three domains of life: Archaea, Bacteria, and Eukarya. Archaea and bacteria are prokaryotes lacking nuclei and organelles, while eukaryotes have nuclei and membrane-bound organelles.
- Eukaryotes are divided into four kingdoms: Protista, Plantae, Fungi, and Animalia. Protists are microscopic eukaryotes that may be photosynthetic or heterotrophic. Plants are photosynthetic and multicellular. Fungi are heterotrophic and absorb nutrients. Animals are mobile and ingest food.
- Classification systems have evolved over time based on new discoveries. Early systems grouped by visible characteristics,
The document discusses taxonomy and systematics. It defines taxonomy as the original description and naming of species, while systematics is the arrangement of species into evolutionary groups. It describes the historical development of classification systems from Linnaeus' focus on morphology to the modern three domain system based on molecular evidence. The key approaches of evolutionary systematics, numerical taxonomy, and phylogenetic systematics are also summarized.
The document provides information about Earth's spheres, biomes, ecosystems, and natural resources. It discusses the following:
- Earth has four spheres - the geosphere (rocks), hydrosphere (water), atmosphere (air), and biosphere (life).
- Major biomes include aquatic, desert, tundra, grassland, forest (taiga, temperate deciduous, tropical rainforest), and their characteristic climates, soils, plants and animals.
- Ecosystems involve interactions between biotic factors like producers, consumers, decomposers and abiotic factors like the environment. Species interact through food chains, webs and pyramids.
- Natural resources can be
This document provides information on biological classification systems. It discusses taxonomy, systematics, and classification. It describes Turril's three types of taxonomy (alpha, beta, omega). It also summarizes classical and new systematics. The key classification systems discussed are the artificial, natural, and phylogenetic systems. It provides details on Linnaeus' artificial system and Bentham and Hooker's natural system. It concludes with descriptions of the two, three, four, five, and six kingdom classification systems.
Classifiction and Nomenclature of Kingdoms of LifeCyra Mae Soreda
This document discusses the history and principles of taxonomy and biological classification. It begins with definitions of taxonomy, classification, and nomenclature. It then covers the historical development of classification systems from Aristotle to the modern five-kingdom and three-domain systems. Key figures discussed include Linnaeus, Haeckel, Copeland, and Whittaker. The document also outlines taxonomic ranks, important classification features like embryology and body plans, and rules of scientific nomenclature.
This document discusses various topics related to taxonomy and classification of living organisms. It begins by providing examples of common names for plants in different languages that can be confusing. It then introduces binomial nomenclature developed by Carolus Linnaeus to systematically name organisms using genus and species. Rules for naming organisms developed by the International Code of Nomenclature are outlined. The concepts of classification, taxonomy, and systematic are defined and their objectives and components are described. The taxonomic hierarchy from species to kingdom is explained along with examples. Identification aids used in classification are also briefly mentioned.
Principle of classification of living thingsmnyaongo
The document discusses the principles of classification of living things according to Carolus Linnaeus. It provides background on classification systems, including that classification involves grouping organisms based on similarities. It describes Linnaeus' contributions, including establishing a hierarchical classification system with seven main categories (kingdom to species) and developing binomial nomenclature using two-word scientific names. The document also discusses concepts like homology, analogy, taxonomy and challenges in classifying organisms.
This document discusses different types of taxonomic characters that can be used to distinguish between taxa. There are 5 main kinds of characters: morphological, physiological, ecological, ethological, and geographical. Morphological characters include external features, internal structures, larval stages, and karyology. Physiological characters include growth rates and temperature tolerances. Ecological characters include habitat preferences, food sources, and host specificity. Ethological characters include behavioral traits like mating calls. Geographical characters include biogeographic patterns and whether populations are allopatric or sympatric. These various character types provide taxonomic information to differentiate between taxa.
The document discusses the basics of biological classification including:
1) The hierarchical system used to classify organisms from broad domains to specific species. This includes kingdoms being divided into phyla, classes, orders, families, genera and species.
2) Key concepts in classification like taxonomy, phylogeny, and binomial nomenclature which assigns each species a unique two-part scientific name.
3) Methods used to determine evolutionary relationships between organisms like fossils, DNA, morphology and embryology which are represented in phylogenetic trees.
Evolution and Biodiversity,Genetics,Digestive System,EcosystemJenevive Oloroso
This document contains a prayer asking for help with work, concentration, understanding, learning, and a peaceful mind, as well as remembering Jesus. It is a short prayer requesting guidance.
This document provides an overview of taxonomy and the characteristics of living organisms. It discusses the levels of biological organization from atomic to biosphere levels. Key topics covered include the characteristics of living things, metabolic reactions, diversity in the living world, classification systems, and the various taxonomic categories such as species, genus, family, order, class, phylum, and kingdom. The document also examines modern taxonomy approaches and the importance and scope of taxonomy.
Evolution is the study of changes in life forms over generations. The theory of evolution proposes that all species are related and gradually change over time through a process called natural selection. Evidence for evolution comes from fossils showing changes in ancient life forms, comparisons of anatomy and genes between current and extinct species indicating common ancestry, and observations of natural selection leading to new species. Charles Darwin's theory of evolution by natural selection established evolution as the underlying mechanism for the diversity of life.
This document discusses the taxonomy, collection, labeling, identification, and preservation of spider specimens. It provides information on:
1. The definition and significance of taxonomy as it relates to classifying and understanding organisms like spiders.
2. Recommended habitats and techniques for collecting spider specimens, including visual searches, sweep nets, beating vegetation, pitfall traps, and litter sampling.
3. Proper preservation of spider specimens requires storing them in 70-80% alcohol mixed with glycerol to prevent drying.
4. Specimens should be labeled with information like name, location, habitat, date, and collector for identification purposes.
This document provides information about biology and the classification of living organisms. It discusses the following key points:
- Biology is the science of living organisms and life processes. Modern biology integrates with other fields like chemistry and physics.
- Characteristics of living things include growth, reproduction, metabolism, response to stimuli, homeostasis, and evolution.
- Organisms are classified and grouped into a hierarchy of taxa including species, genus, family, order, class, phylum, and kingdom.
- The five kingdom system classifies organisms into Monera, Protista, Fungi, Plantae, and Animalia based on characteristics like cell structure, nutrition, and lifestyle. Examples of groups within each
Cell Structures, Functions And TransportJoshua Grasso
This document summarizes key structures and functions of eukaryotic cells. It describes organelles common to both plant and animal cells like the nucleus, ribosomes, endoplasmic reticulum, Golgi bodies, mitochondria, and cell membrane. It also highlights structures unique to plant cells, including vacuoles for storage, chloroplasts for photosynthesis, and a cell wall for support and protection. The document provides details on the location, appearance and functions of these various organelles to give an overview of eukaryotic cell structures.
Classification of Plants and Animals By SYED AASIM HAQSYED ASSIM HAQ
This document provides an overview of the classification of plants and animals. It discusses the three domain system of classifying all living things and provides details on the classification of major kingdoms of plants and animals. The key plant groups discussed include algae, bryophytes, pteridophytes, gymnosperms and angiosperms. The major animal phyla described are porifera, coelentrata, ctenophora, platyhelminthes, aschelminths, annelids, arthropoda, mollusca, echinodermata, hemichordata, chordata and the classes under chordata.
The document classifies plants into two main categories: non-flowering plants and flowering plants. Non-flowering plants include mosses, ferns, and gymnosperms. Mosses are the simplest plants and have no roots or vascular tissue, ferns have roots and vascular tissue with spores produced on leaves, and gymnosperms are tall trees with needle-shaped leaves and cones containing naked seeds. Flowering plants are divided into monocots and dicots; monocots have one seed leaf and parallel veins while dicots have two seed leaves and a network of veins.
The document outlines the key characteristics of living things according to biologists. It states that all living things share the characteristics of being cellular, able to reproduce, able to metabolize or obtain and use energy, able to maintain homeostasis, able to pass on hereditary traits, able to respond to their environments, able to grow and develop, and able to adapt and evolve over time. It provides examples for each characteristic and distinguishes between unicellular and multicellular organisms as well as asexual and sexual reproduction.
This document outlines the key characteristics of living things:
1) All living things are made of cells and use the same basic elements of carbon, hydrogen, nitrogen, and oxygen.
2) Living things are organized in complex hierarchies from molecules to cells to tissues and organs.
3) Common characteristics include the ability to reproduce, grow, develop and change over time, respond to their environment, maintain homeostasis, obtain and use energy, and pass genetic information between generations.
This document outlines the six main characteristics of living things: 1) composed of cells, 2) organized structure, 3) use energy, 4) homeostasis, 5) growth, and 6) reproduction. It explains each characteristic and provides examples. The objectives are to determine if something is living or non-living and understand these six traits. As homework, students are asked to find pictures of living and non-living things and be prepared to share them in class.
Classifying Plants According to Different KindsBryan Palavino
This document defines and provides examples of different types of plants. It discusses trees, which have a trunk and apical dominance, and can live for thousands of years. It also covers shrubs, herbs, vines, grasses, desert plants, carnivorous plants, epiphytes, and aquatic plants, noting their key characteristics and providing examples of each type.
The document summarizes the key parts and functions of animal and plant cells. For animal cells, the main parts are the cell membrane, cytoplasm, and nucleus. The cell membrane controls what enters and exits the cell. The cytoplasm is the jelly-like interior where cell activities occur. The nucleus acts as the control center storing DNA. For plant cells, the main parts are the cell wall, cell membrane, cytoplasm, chloroplasts, and nucleus. The cell wall provides structure, while chloroplasts facilitate photosynthesis to produce food. Both cell types share a nucleus that controls the cell and cytoplasm for internal processes.
Living things and non living things (with license)margamargs
This document provides information to help students in grades 1-3 classify living and non-living things. It defines living things as those that need food, water, air, can reproduce, grow and change, and respond to their environment. Non-living things do not need to eat or breathe and cannot reproduce or change. Examples of living things include animals and plants. Examples of non-living things include man-made objects. The document includes an interactive test for students to classify examples as living or non-living.
The document discusses the seven characteristics of living things: movement, respiration, sensitivity, growth, reproduction, excretion, and nutrition. It provides examples for each characteristic, noting that all living things move, respire, are sensitive to their environments, grow over time, reproduce, excrete waste, and require nutrition to live.
This powerpoint can be used in 3rd grade to introduce the features of living and nonliving things. It meets the ELA CCR Standard 2 - Integrate and evaluate information presented in diverse media and formats, including visually, quantitatively, and orally. It also meets the 3rd grade Science Essential Standard 3.L.2 Understand how plants survive and grow.
Plants are divided into two main categories: vascular and non-vascular plants. Vascular plants are further divided into seedless plants like ferns and seed plants like gymnosperms and angiosperms. Gymnosperms produce seeds in cones, while angiosperms produce seeds within fruits. Non-vascular plants like mosses and liverworts have no vascular tissue and reproduce via spores. They alternate between generations that are genetically identical.
This document summarizes plant classification and the life cycle of flowering plants. It discusses that plants are classified into non-flowering plants, which reproduce with spores, and flowering plants, which reproduce with flowers and seeds. Flowering plants are further divided into gymnosperms, which have cones and seeds but no fruit, and angiosperms, which produce fruits containing seeds. The document then outlines the process of photosynthesis, pollination leading to fertilization and seed production, and how seeds germinate into new plants. It concludes with describing asexual reproduction methods of tubers, bulbs, and stolons.
1. A stimulus is any change in an organism's environment that causes it to react, while a response is how the organism reacts to the stimulus through a change in behavior.
2. There are two types of stimuli: external stimuli that come from outside an organism like feeling cold, and internal stimuli that come from inside an organism like feeling hungry.
3. Animals can respond to stimuli through learned behaviors that are taught, like a mother bear teaching her cubs to fish, or through instincts that are inborn reactions like an animal's natural instinct to run from danger.
This document classifies animals according to their structure, diet, and reproduction. It divides animals into invertebrates without backbones and vertebrates with backbones. Invertebrates include arthropods, worms, mollusks, sponges, and echinoderms. Vertebrates include mammals, birds, fish, reptiles, and amphibians. Mammals are viviparous and nourish their young with milk. Birds lay eggs but are otherwise diverse. Fish primarily reproduce through laying eggs while reptiles can be either viviparous or oviparous. Amphibians undergo metamorphosis from aquatic young to terrestrial adults.
All living things are made up of cells, the basic unit of structure and function. Robert Hooke first observed cells in 1655 using a microscope to view cork. Cells contain various organelles that carry out essential functions - the cell membrane contains and protects the cell, the nucleus controls cell processes, mitochondria produce energy, and plant cells also have a cell wall and chloroplasts. While animal and plant cells share many organelles, plant cells have a cell wall and larger vacuoles. Microorganisms like bacteria can be single-celled, while large organisms have many specialized cells.
Natural selection is the process by which evolution occurs according to Darwin's theory of evolution. It involves overproduction of offspring, variation between individuals, competition for limited resources, and the survival and reproduction of individuals with favorable variations best suited to the environment, leading to the passing on of these favorable traits and descent with modification from ancestral forms over many generations.
This document provides an overview of biology and biological classification. It discusses how organisms are classified and named according to their evolutionary relationships. The key domains of life are Bacteria, Archaea, and Eukarya, with Eukarya further divided into protists, fungi, plants, and animals. Modern classification is based on evolutionary history and considers morphological and genetic similarities between organisms.
1. Taxonomy is the science of classifying organisms based on similarities. It involves assigning organisms unique scientific names and grouping them in a hierarchical system from the most general domains to the most specific species level.
2. Phylogeny refers to the evolutionary history and relationships between organisms as depicted in phylogenetic trees, which are hypotheses based on evidence from fossils, morphology, DNA, and other sources.
3. Organisms are classified into taxonomic ranks including domains, kingdoms, phyla, classes, orders, families, genera, and species to reflect their evolutionary relationships.
I tried to integrate basic and important concepts of evolution from different ppt that can be downloaded here in slideshare to have a consolidated theme about evolution.
Evolution is the process of change over generations in a population of organisms. Popular belief prior to Darwin was that species were fixed, but some scientists proposed gradual change to fit environments. Darwin's theory of evolution by natural selection proposed that variation within populations and inheritance of traits with differential survival and reproduction could result in evolution of species over time. Modern synthesis combined Darwin's natural selection with genetics and population thinking.
The document discusses biodiversity and classification of organisms. It describes the 7 characteristics of living organisms, the 2 types of cells (prokaryotic and eukaryotic), and the 3 domains and 6 kingdoms used to classify all organisms. The 6 kingdoms are: Bacteria, Archaea, Protista, Fungi, Plantae, and Animalia. Key differences between domains and kingdoms are summarized.
- Taxonomy is the science of classifying organisms based on similarities. It involves grouping organisms and assigning them both common names and unique scientific names.
- Scientific names use binomial nomenclature, consisting of the genus and species written in italics. The authority is also included for formal names.
- Phylogeny studies evolutionary relationships through traits like morphology, fossils, DNA and more. Phylogenetic trees show hypothesized relationships and can be based on shared derived characters in cladistics.
- Taxonomy is the science of classifying organisms based on similarities. A key principle is binomial nomenclature, which assigns each species a unique two-part scientific name. Phylogeny studies evolutionary relationships between organisms based on evidence like fossils, DNA, and morphology. Cladistics uses shared derived traits to construct phylogenetic trees called cladograms. Major domains include Archaea, Bacteria, and Eukarya, with kingdoms further dividing taxa.
1. 1st lec. introd; classification, phylogeny, tree diagrams and pattrenswaqasAhmadshams
This document provides an introduction to animal diversity and classification. It discusses that zoology is the study of animals, which display immense diversity in forms and complexity. It then covers key concepts in animal classification including the six kingdom system, binomial nomenclature, biological species, taxa, phylogeny, and patterns of animal organization like symmetry, unicellular vs multicellular, and diploblastic vs triploblastic organization. The document provides foundational information on classifying and understanding the relationships between diverse animal forms.
This document provides an overview of evolution and related topics. It defines evolution as any change in allele frequencies in a gene pool over time. The ancient Earth had an atmosphere without oxygen which allowed for the formation of complex organic molecules like amino acids. The first cells were anaerobic and prokaryotic around 3.5 billion years ago. Evidence for evolution includes the fossil record, similarities in living organisms, and DNA/biochemical evidence. Theories of evolution include Lamarck's theory of acquired characteristics and natural selection proposed by Darwin involving variation and the survival of the fittest. Evolution can occur through microevolution within a species or macroevolution leading to new species through gradualism, divergence, or convergent evolution.
This document provides an overview of evolution and related concepts. It begins by outlining the key objectives to be covered, which include understanding natural selection, mutation and gene recombination in evolution, the role of natural selection, types of isolation and speciation. It then defines evolution and discusses early theories of evolution. Key concepts like variation, natural selection, isolation and speciation are explained. Evidence for evolution such as paleontology, biogeography, anatomy and molecular biology is summarized. It concludes with classifications of living things and the general process of biological evolution.
The document discusses several key concepts relating to evolution and the fossil record, including:
- Microevolution involves small changes within a species over short time periods, while macroevolution describes large changes over millions of years that result in new species through speciation events.
- The geologic column provides evidence of evolution through its layered fossil and rock formations arranged from oldest to youngest, though it has gaps and inconsistencies that are puzzling.
- The Cambrian explosion saw a sudden appearance of many animal phyla without clear precursor fossils, challenging gradual evolution theories.
- Comparative anatomy and embryology provide evidence of common ancestry through homologous structures, though their interpretation differs between evolutionary and creationist viewpoints.
Evolution is the process by which organisms acquire adaptations over time. There are several lines of evidence that support the theory of evolution, including:
- Comparative anatomy, which looks at anatomical similarities between species and finds homologous structures that suggest a common ancestor.
- DNA analysis, where closer genetic relationships are found between species that share more similarities in their DNA sequences.
- The fossil record, where fossils in older rock layers tend to resemble more ancient organisms, while fossils in newer layers more closely resemble present-day species.
The document provides evidence for organic evolution from various areas:
1. Homologous organs show divergent evolution from a common ancestor into different species over time. Analogous organs show convergent evolution of similar functions but different origins.
2. Fossils like Archaeopteryx provide direct evidence as a connecting link between reptiles and birds. A series of horse fossils show evolution of the species over time.
3. Similarities in early embryo development and similarities between species in biochemistry and genetics provide further evidence for evolution from common ancestors.
Evolution is the change in genetic makeup of a population over generations through processes like natural selection and genetic drift. The document provides evidence for evolution from fossils showing successive changes in ancient organisms, homologous and vestigial anatomical structures, similarities in DNA and proteins between species, and developmental similarities between embryos of different species. Examples are given of observable evolution like industrial melanism and antibiotic resistance in bacteria.
This document provides an overview of microbiology and the classification of microorganisms. It discusses how Carolus Linnaeus established the scientific naming system using genus and species names. Microorganisms are classified into three domains - Archaea, Bacteria, and Eukarya - based on characteristics like cell structure and nucleic acid. Within these domains, microbes are further classified into six kingdoms and grouped according to their features. The document also describes key characteristics of bacteria, archaea, fungi, protozoa, algae, viruses, and multicellular parasites.
This document provides evidence in support of evolution by natural selection from multiple sources. It discusses the fossil record showing transitions between species over time. It also describes homologous and vestigial structures as well as similarities in embryology as evidence from the anatomical record. Furthermore, it notes molecular evidence from similarities in protein and DNA sequences. The document also gives examples of both natural and artificial selection influencing evolution.
The document provides evidence from multiple sources supporting the theory of evolution by natural selection, including the fossil record, anatomical record, molecular record, and artificial selection. It describes how each line of evidence, such as homologous and vestigial structures, comparative embryology, DNA and protein comparisons, and examples of selective breeding, provides independent lines of confirmation that organisms are descended from common ancestors and have evolved over time.
Classification groups organisms based on similarities and arranges them in a logical, hierarchical order. The fundamental unit of classification is the taxon, with species being the lowest taxon and kingdom being the highest. Organisms are identified using their binomial scientific name, consisting of the genus and specific epithet. Phylogenetic trees show hypothesized evolutionary relationships between taxa based on evidence from fossils, morphology, embryology, and DNA. Dichotomous keys use a series of choices to identify organisms based on distinguishing characteristics.
This document provides information about fossils and methods used to date the age of fossils. It discusses the different types of fossils that can form like molds, casts, carbon films, and trace fossils. Living fossils are described as organisms that have survived relatively unchanged for millions of years. Transitional fossils are discussed as evidence of evolution but are noted to be rare. Methods for dating fossils include relative dating based on positioning in rock layers and absolute dating techniques like radiometric dating which provide numeric ages but have assumptions and margins of error.
This document discusses simple machines and how they make work easier. It defines work as a force moving an object over a distance. The six basic simple machines that reduce the force needed for work are the inclined plane, wedge, screw, lever, wheel and axle, and pulley. Each machine works by either changing the size or direction of the applied force. Compound machines combine two or more simple machines to accomplish work.
This document discusses key aspects of scientific inquiry including conclusions and presentations. It provides examples of scientific facts, theories, and laws. Facts are objective observations that can be verified, theories are explanations for how natural phenomena work that can be observed and tested, and laws are descriptions of observable phenomena that always apply under the same conditions. The document also addresses forming hypotheses, collecting and analyzing data, drawing conclusions, and sharing findings.
This document provides instructions for an experiment to test whether eggs can float in water with added salt. The scientific method is followed, beginning with making observations and forming a hypothesis that eggs will float if enough salt is dissolved in water. Materials are listed and procedures described for conducting trials adding increasing amounts of salt to water and recording if the egg sinks or floats. Data is organized in a table and graph showing that eggs begin to float when salt reaches 25-30 ml added to 300 ml water. The conclusion supports the hypothesis and results are shared with the class.
This document provides information about science experiments, including the scientific method, variables, controls, hypotheses, procedures, data collection, analysis, and conclusions. It discusses key parts of an experiment like the independent and dependent variables, controls, developing hypotheses, designing procedures, collecting objective versus subjective data, analyzing results, and drawing conclusions. Examples are provided to illustrate these scientific experiment concepts.
This document provides an overview of the scientific method process, including:
1) Observation and forming a testable question, which should have one variable and measurable outcomes.
2) Developing a hypothesis in an "if...then...because" format to make an educated guess about what will happen during the experiment.
3) Designing and performing an experiment to test the hypothesis by manipulating the variable and collecting objective data.
4) Analyzing the results to determine if the hypothesis was supported or needs revising, and drawing a conclusion.
The document summarizes several key human body systems and the five senses. It includes review questions about the nervous system and its major divisions of the central nervous system and peripheral nervous system. Experiments are described to test sight, smell, taste, touch and reflexes. Step-by-step instructions for a bovine eye dissection are provided to examine the anatomy of vision.
This document provides information about the human nervous system, including:
- The central nervous system (CNS) which includes the brain and spinal cord.
- The peripheral nervous system (PNS) which includes nerves that connect all body parts to the spinal cord, including somatic nerves (voluntary movement and senses) and autonomic nerves (involuntary functions).
- Key parts of the brain like the cerebrum, cerebellum, and brain stem and their functions.
- How the nervous system uses neurons, synapses, and neural pathways to collect sensory input, integrate it in the brain, and result in motor outputs to the body's muscles and glands.
Here are the major human body systems and some of their key organs:
- Digestive system: mouth, esophagus, stomach, small intestine, large intestine, liver, pancreas, gallbladder
- Circulatory/Cardiovascular system: heart, blood vessels (arteries, veins, capillaries)
- Respiratory system: nose, pharynx, larynx, trachea, lungs, diaphragm
- Urinary system: kidneys, ureters, bladder, urethra
- Integumentary system: skin, hair, nails
- Skeletal system: bones, cartilage, ligaments, tendons
- Muscular system:
This document summarizes key aspects of the respiratory system and the effects of smoking. It describes the major parts of the respiratory system including the nose, larynx, trachea, lungs, bronchi, and alveoli. It explains how gas exchange occurs in the alveoli and the composition of inhaled and exhaled air. It also details the mucus elevator defense system and effects of smoking such as increased risk of various diseases, cancer, and overall shortened lifespan.
The cardiovascular system circulates blood throughout the body via the heart and blood vessels. The heart has four chambers and pumps around 4,000 gallons of blood per day through arteries, veins, and capillaries to deliver oxygen and nutrients to cells and remove carbon dioxide and waste. Blood contains plasma, red blood cells to carry oxygen and carbon dioxide, white blood cells to fight infection, and platelets to help clotting.
This document provides information about the human digestive system and nutrition. It defines the major parts of the digestive system and their functions. It also explains the three main types of nutrients - carbohydrates, lipids (fats), and proteins. For each nutrient, it identifies food sources and describes the digestion process. Additionally, it distinguishes between good and bad types of each nutrient and provides examples. The document aims to educate about nutrition and how the body breaks down and uses different foods.
This document provides information about the human digestive and excretory systems. It describes the major organs involved in digestion, including the mouth, esophagus, stomach, small intestine, large intestine, liver, and pancreas. It explains the physical and chemical processes of digestion that break down food into smaller molecules that can be absorbed and used by the body. These include mechanical and chemical digestion in the mouth, stomach acid and enzymes, and nutrient absorption in the small intestine. The document also covers the role of the kidneys and urinary system in filtering waste from the blood and excreting it from the body as urine.
This document provides information about the human body systems, specifically bones and muscles. It begins with a review quiz about the skin and its layers (epidermis, dermis, hypodermis). It then discusses the chicken wing dissection and homologous features in the human body. The document lists and describes various bones and their functions. It also covers bone cells, tissues, and shapes. Finally, it discusses the three types of muscle tissues and their roles in voluntary and involuntary movement.
The document summarizes the human body systems, beginning from the cellular level up to full organ systems. It describes that cells make up tissues, tissues make up organs, and organs work together in organ systems to carry out functions. As an example, it focuses on the integumentary system and skin, describing the three layers of the skin (epidermis, dermis, hypodermis), their components and functions, as well as common skin problems like acne, dermatitis, skin cancer and burns.
This document discusses the classification of living things. It begins by explaining that Carolus Linnaeus developed the first scientific classification system in the 1700s, grouping organisms into three kingdoms: Animal, Vegetable, and Mineral. It then discusses how modern taxonomy further classifies organisms using a hierarchical system of domains, kingdoms, phyla, classes, orders, families, genera, and species. The rest of the document provides details on the six kingdoms of life - Archaea, Bacteria, Protista, Fungi, Plantae, and Animalia - and examples of major groups within each kingdom.
This document discusses basic concepts of genetics and inheritance, including:
- Germ cells undergo meiosis to form gametes like eggs and sperm, which are haploid.
- Gregor Mendel conducted experiments on pea plants in the 1800s and discovered dominant and recessive traits are inherited based on predictable ratios.
- Traits are determined by alleles, or variations of genes. Dominant alleles are expressed over recessive alleles in heterozygotes based on genotypes.
- Meiosis and fertilization allow for genetic variation through independent assortment and recombination of parental chromosomes.
This document discusses key concepts about the water cycle and glaciers. It begins with a review of where glaciers form and icebergs come from. It then covers the water cycle in more detail, explaining processes like precipitation, infiltration, evaporation, transpiration, runoff, and aquifer storage. Glacial movement and erosion are described. The document concludes with a review quiz testing understanding of these hydrologic and glacial concepts.
The document discusses managing natural resources and preserving Earth's cycles. It covers renewable and nonrenewable resources, describing examples of each type. Renewable resources include air, water, living things, land, sun, wind and geothermal energy. Nonrenewable resources are being used faster than they can be replenished, such as fossil fuels like coal and natural gas, minerals, and land. Air and soil pollution from human activities are also discussed.
Earth provides many natural resources that are necessary or useful to humans. Resources can be classified as renewable or nonrenewable. Renewable resources, like sunlight, wind, water, and plants, can replenish themselves within our lifetime or within a human timescale. Nonrenewable resources, like fossil fuels and minerals, cannot replenish themselves within our lifetime or within a human timescale. It is important that humans use all resources sustainably so they will be available for future generations.
2. Phyletic Gradualism (Uniformitarianism)
Sedimentation rates we commonly see today are very
slow (centimeters/year)
• Assuming those rates have been constant throughout Earth’s
history, it would take millions of years for the sedimentary
layers we see at locations such as the Grand Canyon to form
3. Phyletic Discontinuity
(Catastrophism)
Catastrophic events (volcanoes, floods, etc.) cause
rapid, widespread sedimentation and dramatic changes
to the geologic record
• Mt. St. Helens displaced huge amounts of dirt, rock and snow,
carving a mini grand canyon and leaving over 50 feet of
sediment deposited across the valley within a matter of
minutes
4. Punctuated
Equilibrium
Slow sedimentation rates and
evolutionary changes
"punctuated" (interrupted) by
events that facilitate rapid
bursts of evolution
• Mass extinctions
• Explains "Cambrian Explosion"
Sudden appearance of new
species (fossils)
• Explains lack of transitional fossils
5. Fossil Dating Methods
Stratigraphy
• Age of rock layers and the fossils within are
interpreted with the belief that younger fossils are
deposited on top of older fossils (superposition)
Radioisotope Dating
• Decay of unstable elements used to measure
elapsed time (assumes known original amount,
constant rate of decay, and lack of contamination)
Molecular Clocks
• Measurable rates of mutation used
to compare DNA of organisms and
estimate time between evolved
ancestors
6. Classification & Phylogeny
Classification
• the process of describing,
naming, and grouping things
based on their similarities
• grouped organisms are easier
to study
Taxonomy
• scientific study of how living
things are classified
Phylogeny
• the evolutionary history of a
organisms as depicted in a
"family tree"
7. Systems of Classification
Carolus Linnaeus (1750s)
• grouped organisms based on observable features (long
before evolution was proposed)
• system used for over 250 years
• devised naming system for organisms
Binomial Nomenclature
2 part naming system using Latin words
Genus species (i.e. Felis concolor)
Phylogenetic Classification 1707-1778
• Retains Linnaean system for the most part
• Species with similar hypothesized evolutionary histories
are grouped more closely together
• Based on DNA similarities more than physical appearance
• Evolution of species is presupposed
8. Levels of Classification
There are 7 levels of
classification.
Remember: King Philip Came Over
For Good Soup
Kingdom broadest level
Phylum
Class
Order
Family
Genus
Species most specific
9.
10. Binomial Nomenclature
two-name system of naming
• Genus is 1st name (upper case); species is 2nd name (lower case
11. Phylogenetic Tree
Classification
based on :
• Morphology (similar
physical structures)
• Fossil record
• Embryological
patterns of
development
• Genetic similarities
(DNA)
12. Cladograms
A phylogenetic tree is based on a grouping/sorting similar organisms
into groups called clades.
This is a relatively new system of grouping incorporating the same
derived characteristics to represent evolutionary relationships.
• Organisms within
a group are
descended from a
common ancestor
• There is a
branching pattern
(splits in two where
changes occur)
• Change in
characteristics
occur in lineages
over time
13.
14. Homologous Characteristics
A structure found in different species, but derived from a
common ancestral structure.
• The structure may or may not be used for the same function in the
species in which it occurs.
Examples:
• skeletal
structure of
vertebrate
limbs
• embryonic
similarities
• similarities in
DNA, RNA, &
their proteins
15. Embryonic
Homologues Turtle
Structures that have different
mature forms but develop
from the same embryonic Primitive
Fish
tissues
Alligator
Limbs are structurally similar
but have different functions
Recent developments in
biochemistry show "similarity
does not imply a genetic
relationship"
Mammal
18. Analogous Structures
Similar in function, but NOT derived from a common ancestral
structure
Examples:
• wings of birds
& bats
• walking limbs
of insects &
vertebrates
• eyes of a horse
and an octopus
• human skull
and beetle's
head shield
exoskeleton
Bones are homologous structures, but wings are
only analogous.
19. Inherited Traits
Neo-Darwinism incorporates the
similarities of genetics between
species as evidence of evolution
Other scientists look at genetic
code and see the complexity and
efficiency of information transfer
as evidence for an intelligent
“designer”
20. Six
Kingdoms
Archaebacteria
Eubacteria
Protists
Fungi
Plants
Animals
First true cells are thought to have
arisen from aquatic, anaerobic,
"protocells"
EUBACTERIA
ARCHAEBACTERIA
6
22. Domain (or Kingdom) Archaea
Formerly part of the
Monera kingdom
Bacteria that live in
extreme conditions:
• hot
• acidic
• sulfuric
• deep
• cold
23. Domain (or Kingdom) Eubacteria
Formerly part of the Monera
kingdom
"True Bacteria"
• make us sick
• live in our intestines
• make cheese
Different shapes
• Bacilli (rod-shape)
• Strep/Staphylococcus (round
chains/clusters)
• Spirilla (stringy spirals)
24. Domain Eukaryota
Includes all eukaryotic
organisms
Includes 4 kingdoms:
• Protista
• Fungi
• Plants
• Animals
25. ke
Kingdom Protista
a l-Li s)
A nim zoan
to
(pro
Eukaryotic (have
nucleus)
Paramecium Giardia
Amoeba Single-celled
Fungus- P
l
Like a
n
Water Mold Slime Mold t
-
L
i
Euglena Dinoflagellates Green Algae Brown Algae Diatom k
e
31. Dichotomous Keys
1a. Organism has 4 legs Go to # 2
1b. Organism has more than 4 legs Go to # 20
2a. Organism has a tail Go to # 3
2b. Organism has no tail Go to # 35
3a. Organism has stripes Bengal Tiger
3b. Organism has no stripes African Lion
Editor's Notes
“The Present is key to the Past”
What affect do you think a global flood could have on sedimentation rates?
A tree typically grows one ring each year. Thus, if you cut a tree down and count the tree rings, you can determine how old the tree is. If there are 123 rings, the tree is, most likely, 123 years old. Counting tree rings is a good method for determining the age of a tree, but how does that help determine the age of artifacts in archaeology? Well, the first thing that you have to realize is that the appearance of a tree ring depends on several environmental factors for the year in which the ring was formed. The length of the growing season, the amount of rain, the average temperature, and several other factors all play a role in determining how wide and dark the ring being grown that year will be. As you look at a tree's rings, then, you will see patterns of wide rings, thin rings, dark rings and light rings. Those patterns are a result of the weather patterns that occurred in the tree's environment over its lifetime. Okay, fine, but how does that help an archaeologist? Well, since the weather in a given region affects the appearance of tree rings, archaeologists studying a certain region can cut down an old tree that is still alive. They can then look for distinct patterns of tree rings that correspond to several years of a given weather pattern for that region. Counting from the outside of the tree to the start of this special pattern will then tell archaeologists how many years ago that weather pattern occurred. Archaeologists find several such patterns and catalog them as master tree ring patterns for that region of the world. So, when an archaeologist discovers a log that was once used to build a home or something like that, he or she can look at the rings in the log and try to find one of those master tree ring patterns. If the archaeologist finds one, then he or she knows how many years ago the ring patterned formed, because that has already been determined. Since the archaeologist knows when that ring pattern was formed, he or she can then count the remaining rings on the tree that was discovered and determine when that tree was cut down. That will tell the archaeologist how long ago the people who cut down the tree were alive, and that will determine the age of the artifacts left by those people. Archaeologists have cataloged master tree rings patterns which have allowed them to date certain artifacts to as far back as 6600 B.C. Now before I go any further, I have to point out something that is very important. You must pay close attention here:
Before 1970 , taxonomists classified all forms of life into two kingdoms: Animalia and Plantae (based on Linneaus ). Bacteria, fungi, and photosynthetic protists (as they were discovered) were considered plants, and the protozoa were classified as animals. In 1969, Robort H. Whittaker proposed a five-kingdom classification scheme. Whittaker identified two kingdoms of primarily unicellular microorganisms based on whether they showed prokaryotic or eukaryotic cellular organization. The kingdom Monera consists of generally single prokaryotic cells, whereas the kingdom Protista consists of generally single eukaryotic cells. All of the organisms in the remaining three kingdoms (Plantae, Fungi and Animalia) are eukaryotic, and most of them are multicellular. Carl Woese introduced a sixth kingdom in 1990 , and a restructuring called the "Tree of Life" consisting of three domains. The cell structure of "extremophiles" (Archaea) is so different from that of prokaryotic and eukaryotic cells, he argued, that they should occupy their own kingdom.
Can we figure out the blanks? The American Kestrel (Falco sparverius) Turdus migratorius (common robin)
Could be evidence for descent with modification Could be evidence for a single intelligent “creator”
Do similar embryological forms show common ancestry or a common designer? Ludwig Rutimeyer, a professor of zoology and comparative anatomy, at the University of Basel, reviewed Haeckel's work and Haeckel's mistakes were brought to the attention of the professors at Jena (Rutimeyer 1868). Charged with fraud by five professors and convicted by a university court at Jena, he agreed that a small percentage of his embryonic drawings were forgeries. Haeckel alleged he was merely filling in and reconstructing the missing links when the evidence was thin. During the trial, Haeckel confessed that he had altered his drawings, but excused himself by saying: “I should feel utterly condemned and annihilated by the admission, were it not that hundreds of the best observers and biologists lie under the same charge. The great majority of all morphological, anatomical, histological, and embryological diagrams are not true to nature, but are more or less doctored, schematized and reconstructed”.
Case Study: Developmental Homologies In 1868, a scientist named Ernst Haeckel published drawings of early vertebrate embryos which he manipulated to look more similar than they actually were. This was because he held preconceived views about evolution. Haeckel’s drawings were eventually recognized as fraudulent, but they are still found in some biology textbooks as good evidence for common ancestry. Haeckel’s ideas continue to spread misconceptions today. In humans at one month, there are throat pouches in the skin near the neck. These are sometimes labeled as ‘gillslits’, suggestive of a fish ancestry. In fish, these pouches do develop into gills. But in humans and other organisms, the middle ear canals develop from the second pouch, and the parathyroid and thymus glands come from the third and fourth. These labels are therefore quite biased. Other common misconceptions include the idea that a human embryo has a ‘yolk sac’ like a chicken and a ‘tail’ like a primate. These parts have now been identified as the blood-forming sac and the coccyx : an important point of muscle attachment necessary for our upright posture.
Other examples: camera eye of the vertebrate and the cephalopod (squid & octopus): walking limbs of insects and vertebrates cranium of vertebrates and exoskeletal head shield of insects fusiform shape of fish and cetaceans (whales & dolphins)
Darwin didn’t know about DNA – it hadn’t been invented yet. Most people of his time believed that things you learned and experienced during your lifetime could be inherited by your offspring. Darwin believed there had to be a system to pass down physical traits and he was right. Since Watson & Crick discovered how nucleic acids transfer genetic material in 1953, a whole new field of genetics has exploded into the realm of science .
Before 1970, taxonomists classified all forms of life into two kingdoms: Animalia and Plantae. Bacteria, fungi, and photosynthetic protists were considered plants, and the protozoa were classified as animals. In 1969, Robort H. Whittaker proposed a five-kingdom classification scheme that is widely used today, and which we follow in this text. Whittaker identified two kingdoms of primarily unicellular microorganisms based on whether they showed prokaryotic or eukaryotic cellular organization. The kingdom Monera consists of generally single prokaryotic cells, whereas the kingdom Protista consists of generally single eukaryotic cells. All of the organisms in the remaining three kingdoms (Plantae, Fungi and Animalia) are eukaryotic, and most of them are multicellular. They may be classified further on the basis of their way of acquiring nutrients. Members of the kingdom Plantae photosynthesize, and members of the kingdom Fungi secrete enzymes outside their bodies and then absorb the externally digested nutrients. In contrast, members of the kingdom Animalia ingest their food and then digest it, either within an internal cavity or within individual cells. Recently, a sixth kingdom has been proposed. Many microbiologists argue that the cell structure of the Archaea is so different from that of prokaryotic and eukaryotic cells that they should occupy their own kingdom. Following the fashion, this text adopts the updated six-kingdom classification system (Fig. 1.1). 6 Kingdom Classification System Kingdom Eubacteria: true bacteria (formerly in kingdom monera) Kingdom Archebacteria: extremophiles (formerly in kingdom monera) Kingdom Protista (same)
Formerly part of the kingdom monera Microbiologists who study bacteria determined that the DNA of these are much different from other, true bacteria Most Archaea live in extreme conditions (very hot, acidic/basic, sulfurous, etc)
Formerly a part of the kingdom monera Name means “true bacteria” These are the kind of bacteria likely to make us sick, live in our gut to help us digest food, or be used in the making of cheese Bacilli Streptococcus Staphylococcus Dicoccus Spirilla
Contains all of the eukaryotes (organisms with a nucleus in their cells) Protista Fungi Plantae Animalia
Includes All Protists: Eukaryotic Unicellular Animal-Like Protists (protozoans) Pseudopods, Ciliates, Flagellates Examples: Amoeba, Paramecia, Giardia Plant-Like Protists (autotrophic) Euglenoids, Dinoflagellates, Diatoms, Green/Red/Brown Algae Fungus-Like Protists Examples: Water molds, slime molds
All eukaryotic, multicellular, heterotrophic, sessile organisms Includes: molds, mushrooms, rusts, lichens Mycorrhizal associations allow plants to absorb more water and nutrients from the soil
All eukaryotic, multicellular, autotrophic, sessile organisms Produce their own food from sunlight and carbon dioxide Common Phyla: Bryophyta (mosses) Pteridophyta (ferns) Coniferophyta (conifers, like pine trees) Angiospermophyta (angiosperms, like flowering plants
All eukaryotic, multicellular, heterotrophic, motile (most) organisms Common Phyla: Porifera (sponges, corral) Cnidaria & Ctenophora (jellyfish and similar animals) Platyhelmenthes (flat worms, tapeworms) Nematoda (small unsegmented worms)