The document discusses classification systems used to organize living things into taxonomic groups based on similarities and evolutionary relationships. It describes the five-kingdom system and binomial naming convention. Key groups covered include animals, plants, fungi, bacteria, protoctists, and viruses. Characteristics used to classify vertebrates like fish, amphibians, reptiles, birds and mammals are also outlined.
Simply put, the living world can be described as the world around us. It comprises all living creatures, plants and microorganisms that we cannot see. It has changed over the course of billions of years but the general composition has remained the same. The main components are still organic and inorganic matter. Living things are divided into five kingdoms: animal, plant, fungi, protist and monera. Living things are divided into five kingdoms: animal, plant, fungi, protist and monera. Living things are divided into five kingdoms: animal, plant, fungi, protist and monera.
IGCSE Biology 0610 - Introduction to Biology - Characteristics of living orga...Vasiliki Makrygianni
IGCSE Biology 0610/ Syllabus 2020-2022/
Coursebook: Cambridge IGCSE Biology Coursebook (third edition), Mary Jones and Geoff Jones, Cambridge University Press.
note: free to share and use ...is designed for level B1-B2. cheers,...
The Living World Biology Class notes for NEET preparationMiso Study
Class 11th Biology important topic for preparation of NEET 2019 exam by expert faculty. These is sample class notes on The Living World. You can download free from https://bit.ly/2L0hQnr
Simply put, the living world can be described as the world around us. It comprises all living creatures, plants and microorganisms that we cannot see. It has changed over the course of billions of years but the general composition has remained the same. The main components are still organic and inorganic matter. Living things are divided into five kingdoms: animal, plant, fungi, protist and monera. Living things are divided into five kingdoms: animal, plant, fungi, protist and monera. Living things are divided into five kingdoms: animal, plant, fungi, protist and monera.
IGCSE Biology 0610 - Introduction to Biology - Characteristics of living orga...Vasiliki Makrygianni
IGCSE Biology 0610/ Syllabus 2020-2022/
Coursebook: Cambridge IGCSE Biology Coursebook (third edition), Mary Jones and Geoff Jones, Cambridge University Press.
note: free to share and use ...is designed for level B1-B2. cheers,...
The Living World Biology Class notes for NEET preparationMiso Study
Class 11th Biology important topic for preparation of NEET 2019 exam by expert faculty. These is sample class notes on The Living World. You can download free from https://bit.ly/2L0hQnr
These resources below are not mine so all credits go to Zubair Junjunia. I am sharing this as it covers the whole content of CIE IGCSE Biology and it is very helpful but can be useful for other boards. Thanks for viewing !!!
Biological Classification
This ppt shows the details of biological classification. it gives a brief idea about the five kingdom classification with a detailed description of kingdoms monera, protista and fungi. a detailed description of viruses, viroids, prions and lichens have also been given....
For more details visit my youtube channel: (VIHIRA ACADEMY)
https://www.youtube.com/channel/UCxo06Nj-QWo_7SNvMyDnJCQ?view_as=subscriber
There are various online networking sites such as Facebook, twitter where students casually discuss their educational
experiences, their opinions, emotions, and concerns about the learning process. Information from such open environment can
give valuable knowledge for opinions, emotions and help the educational organizations to get insight into students’ educational
life. Analysing down such data, on the other hand, can be challenging therefore a qualitative research and significant data
mining process needs to be done. Sentiment classification can be done using NLP (Natural Language Processing). For a social
network that provides micro blogging services such as twitter, the incoming tweets can be classified into News, Opinions,
Events, Deals and private Messages based on authors information available in the tweets. This approach is similar to
Tweetstand, which classifies the tweets into news and non-news. Even for e-commerce applications virtual customer
environments can be created using social networking sites. Since the data is ever growing, using data mining techniques can get
difficult, hence we can use data analysis tools
These resources below are not mine so all credits go to Zubair Junjunia. I am sharing this as it covers the whole content of CIE IGCSE Biology and it is very helpful but can be useful for other boards. Thanks for viewing !!!
Biological Classification
This ppt shows the details of biological classification. it gives a brief idea about the five kingdom classification with a detailed description of kingdoms monera, protista and fungi. a detailed description of viruses, viroids, prions and lichens have also been given....
For more details visit my youtube channel: (VIHIRA ACADEMY)
https://www.youtube.com/channel/UCxo06Nj-QWo_7SNvMyDnJCQ?view_as=subscriber
There are various online networking sites such as Facebook, twitter where students casually discuss their educational
experiences, their opinions, emotions, and concerns about the learning process. Information from such open environment can
give valuable knowledge for opinions, emotions and help the educational organizations to get insight into students’ educational
life. Analysing down such data, on the other hand, can be challenging therefore a qualitative research and significant data
mining process needs to be done. Sentiment classification can be done using NLP (Natural Language Processing). For a social
network that provides micro blogging services such as twitter, the incoming tweets can be classified into News, Opinions,
Events, Deals and private Messages based on authors information available in the tweets. This approach is similar to
Tweetstand, which classifies the tweets into news and non-news. Even for e-commerce applications virtual customer
environments can be created using social networking sites. Since the data is ever growing, using data mining techniques can get
difficult, hence we can use data analysis tools
The planning processes of most best practice organizations not only define what will be accomplished within a
given time-frame, but also the numbers and types of human resources that will be needed to achieve the defined
business goals (e.g., number of human resources; the required competencies; when the resources will be needed; etc.).
The human resources department is a critical component for employees in any business, regardless of its size. This
support system is responsible for everything from payroll to hiring a new employee. Human resource planning is an
extended part of this system, and is used to ultimately structure and meet organizational goals. While a traditional
human resource role serves as an administrative control function, human resource planning develops strategies for
matching the skills and size of the workforce to organizational needs. In other words, the planning system specifically
recruits, trains and restructures the staff/personnel needed to meet business objectives and any changes within the
external environment. Three main responsibilities are important to complete in order to prepare for the planning
process. These responsibilities include forecasting the demand for labor, performing a supply analysis, and balancing
supply and demand considerations.
This paper presents machine translation based on machine learning, which learns the semantically
correct corpus. The machine learning process based on Quantum Neural Network (QNN) is used to
recognizing the corpus pattern in realistic way. It translates on the basis of knowledge gained during
learning by entering pair of sentences from source to target language. By taking help of this training data
it translates the given text. own text.The paper consist study of a machine translation system which
converts source language to target language using quantum neural network. Rather than comparing
words semantically QNN compares numerical tags which is faster and accurate. In this tagger tags the
part of sentences discretely which helps to map bilingual sentences.
Arrivano da tutta Europa le storie di cittadinanza attiva contenute nella pubblicazione “My e-Participation Story”. Il volume, scaricabile online, raccoglie i casi vincitori dell'omonima competizione promossa da Telecentre Europe e cofinanziata dall'Unione europea nel 2015.
C'è chi, in Albania, ha contribuito al decision making del governo sullo smaltimento delle armi chimiche siriane, grazie alla mobilitazione di studenti e ambientalisti, uniti sui social media nel promuovere una petizione online. O anche i pensionati di una residenza di edilizia pubblica, in Germania, che hanno sensibilizzato l'opinione pubblica, grazie ad un sito e a Change.org, contro la privatizzazione delle loro case e conseguente aumento degli affitti dell'80%. A Taranto un gruppo di studenti e insegnanti ha sollevato il problema dell'inquinamento della loro città, grave al punto da pregiudicare il turismo; perciò ha promosso un dialogo con le istituzioni a livello europeo tramite Twitter.
Tutte le storie raccolte nel volume sono casi esemplari di cittadini che hanno utilizzato i diversi strumenti offerti dalle tecnologie digitali come cassa di risonanza per dare rilievo alle cause che stavano loro a cuore, diventando cittadini consapevoli e partecipi nella gestione delle politiche più rilevanti per la comunità. I protagonisti di queste storie sono ragazzi, adulti giovani e meno giovani, ma anche persone anziane di tutta l'Europa accomunati dalla convinzione di poter contare davvero, grazie a Facebook, Twitter, app, petizioni online o siti dedicati.
Edexcell Biology;
Most year 10 & 11 syllabus points by ppt.
Used in lessons to scaffold class teaching and as a revision resource for students
These resources are from many sources
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
Multi-source connectivity as the driver of solar wind variability in the heli...Sérgio Sacani
The ambient solar wind that flls the heliosphere originates from multiple
sources in the solar corona and is highly structured. It is often described
as high-speed, relatively homogeneous, plasma streams from coronal
holes and slow-speed, highly variable, streams whose source regions are
under debate. A key goal of ESA/NASA’s Solar Orbiter mission is to identify
solar wind sources and understand what drives the complexity seen in the
heliosphere. By combining magnetic feld modelling and spectroscopic
techniques with high-resolution observations and measurements, we show
that the solar wind variability detected in situ by Solar Orbiter in March
2022 is driven by spatio-temporal changes in the magnetic connectivity to
multiple sources in the solar atmosphere. The magnetic feld footpoints
connected to the spacecraft moved from the boundaries of a coronal hole
to one active region (12961) and then across to another region (12957). This
is refected in the in situ measurements, which show the transition from fast
to highly Alfvénic then to slow solar wind that is disrupted by the arrival of
a coronal mass ejection. Our results describe solar wind variability at 0.5 au
but are applicable to near-Earth observatories.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...Scintica Instrumentation
Intravital microscopy (IVM) is a powerful tool utilized to study cellular behavior over time and space in vivo. Much of our understanding of cell biology has been accomplished using various in vitro and ex vivo methods; however, these studies do not necessarily reflect the natural dynamics of biological processes. Unlike traditional cell culture or fixed tissue imaging, IVM allows for the ultra-fast high-resolution imaging of cellular processes over time and space and were studied in its natural environment. Real-time visualization of biological processes in the context of an intact organism helps maintain physiological relevance and provide insights into the progression of disease, response to treatments or developmental processes.
In this webinar we give an overview of advanced applications of the IVM system in preclinical research. IVIM technology is a provider of all-in-one intravital microscopy systems and solutions optimized for in vivo imaging of live animal models at sub-micron resolution. The system’s unique features and user-friendly software enables researchers to probe fast dynamic biological processes such as immune cell tracking, cell-cell interaction as well as vascularization and tumor metastasis with exceptional detail. This webinar will also give an overview of IVM being utilized in drug development, offering a view into the intricate interaction between drugs/nanoparticles and tissues in vivo and allows for the evaluation of therapeutic intervention in a variety of tissues and organs. This interdisciplinary collaboration continues to drive the advancements of novel therapeutic strategies.
Introduction:
RNA interference (RNAi) or Post-Transcriptional Gene Silencing (PTGS) is an important biological process for modulating eukaryotic gene expression.
It is highly conserved process of posttranscriptional gene silencing by which double stranded RNA (dsRNA) causes sequence-specific degradation of mRNA sequences.
dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
This process mediates resistance to both endogenous parasitic and exogenous pathogenic nucleic acids, and regulates the expression of protein-coding genes.
What are small ncRNAs?
micro RNA (miRNA)
short interfering RNA (siRNA)
Properties of small non-coding RNA:
Involved in silencing mRNA transcripts.
Called “small” because they are usually only about 21-24 nucleotides long.
Synthesized by first cutting up longer precursor sequences (like the 61nt one that Lee discovered).
Silence an mRNA by base pairing with some sequence on the mRNA.
Discovery of siRNA?
The first small RNA:
In 1993 Rosalind Lee (Victor Ambros lab) was studying a non- coding gene in C. elegans, lin-4, that was involved in silencing of another gene, lin-14, at the appropriate time in the
development of the worm C. elegans.
Two small transcripts of lin-4 (22nt and 61nt) were found to be complementary to a sequence in the 3' UTR of lin-14.
Because lin-4 encoded no protein, she deduced that it must be these transcripts that are causing the silencing by RNA-RNA interactions.
Types of RNAi ( non coding RNA)
MiRNA
Length (23-25 nt)
Trans acting
Binds with target MRNA in mismatch
Translation inhibition
Si RNA
Length 21 nt.
Cis acting
Bind with target Mrna in perfect complementary sequence
Piwi-RNA
Length ; 25 to 36 nt.
Expressed in Germ Cells
Regulates trnasposomes activity
MECHANISM OF RNAI:
First the double-stranded RNA teams up with a protein complex named Dicer, which cuts the long RNA into short pieces.
Then another protein complex called RISC (RNA-induced silencing complex) discards one of the two RNA strands.
The RISC-docked, single-stranded RNA then pairs with the homologous mRNA and destroys it.
THE RISC COMPLEX:
RISC is large(>500kD) RNA multi- protein Binding complex which triggers MRNA degradation in response to MRNA
Unwinding of double stranded Si RNA by ATP independent Helicase
Active component of RISC is Ago proteins( ENDONUCLEASE) which cleave target MRNA.
DICER: endonuclease (RNase Family III)
Argonaute: Central Component of the RNA-Induced Silencing Complex (RISC)
One strand of the dsRNA produced by Dicer is retained in the RISC complex in association with Argonaute
ARGONAUTE PROTEIN :
1.PAZ(PIWI/Argonaute/ Zwille)- Recognition of target MRNA
2.PIWI (p-element induced wimpy Testis)- breaks Phosphodiester bond of mRNA.)RNAse H activity.
MiRNA:
The Double-stranded RNAs are naturally produced in eukaryotic cells during development, and they have a key role in regulating gene expression .
1. Topicone
The binomialsystem
There are millions of species on our planet. Although
species can be very different from each other, many have
similar features that allow us to put them into groups. This
is called classification.
Kingdoms
The first big division of living things in the classification
system is to put them into one of five kingdoms. These
are based on what an organism's cells are like.
The five kingdoms are:
. animals (all multicellular animals)
. plants (all green plants)
. fungi (moulds, mushrooms, yeast)
. prokaryotes (bacteria, blue-green algae)
. protoctists (Amoeba, Chlorella and Plasmodium)
Furtherdivisions
Living things can then be ranked according to:
phylum
class
order
family
2. genus
species
The binomial system of naming species uses Latin
words. Each name has two parts, the genus and the
species. For example, human beings belong to the genus
Homo, and our species is sapiens - so the scientific name
is Homo sapiens.
Erithacus rubecula, the European Robin
The binomial system is important because it allows
scientists to accurately identify individual species. For
example, the European robin is Erithacus rubecula. It is
much smaller than the American robin, Turdus migratorius,
which belongs to a different genus.
Other classificationsystems
Cladistics is another way to classify organisms. It can use
data from DNA or RNA sequences, rather than just
physical characteristics. It emphasises the evolutionary
relationships between different species.
Vertebrates
3. Vertebrates are animals with backbones. They can be
classified according to their features, and include bony
fish, amphibians, reptiles, birds and mammals.
Bony fish
Bony fish absorb oxygen through their
gills and they have wet scales. Their body
temperature varies according to their
surroundings (organisms that do this are
called poikilotherms). Bony fish
reproduce by external fertilisation and lay
eggs (they are oviparous).
Amphibians
Amphibians usually have lungs but they
can also absorb oxygen through their
moist skin. Their body temperature also
varies according to their surroundings.
Amphibians also reproduce by external
fertilisation and lay eggs.
Reptiles
Reptiles have lungs and dry scales. As
with bony fish and amphibians, their body
temperature varies according to their
surroundings. However, reptiles reproduce
by internal fertilisation and lay eggs.
4. Birds
Birds have lungs, feathers and beaks.
They can maintain their body temperature
(organisms that do this are called
homeotherms). Like reptiles, birds
reproduce by internal fertilisation and lay
eggs.
Mammals
Mammals have lungs and fur. Like birds,
they can maintain their body temperature.
Mammals reproduce by internal
fertilisation and they give birth to live
young (they are viviparous).
Invertebrates– arthropods
Invertebrates are animals without backbones. They
include annelids, nematodes, molluscs and arthropods.
Arthropods are an important phylum of invertebrates.
They have:
. a hard exoskeleton (their skeleton is on the outside
rather than on the inside)
. a segmented body (their body has different sections)
jointed legs
Other invertebrates
5. Other invertebrate groups include:
annelids
nematodes
molluscs
Unlike arthropods, these invertebrates do not have
jointed legs.
Annelids
Annelids are segmented worms with soft
bodies. Most of the worm’s body consists
of identical segments, giving it a ‘ringed’
appearance.
Nematodes
Nematodes are tiny, thin worms without
segments. Many species are free-living
but others are parasites that cause
disease. For example, hookworms can
infect humans.
Molluscs
Molluscs usually have a broad muscular foot and may also have a shell.
Examples of molluscs include snails, slugs, squids and octopuses.
6. Floweringplants
Flowering plants can be classified according to the nature of their seeds,
seedlings and leaves. The two largest groups of flowering plants are:
Monocotyledons ,eudicotyledons (also called dicotyledons)
Monocotyledons
Wheat plants are monocotyledons
The seeds of monocotyledons each contain one embryonic leaf (the
‘cotyledon’). Many monocotyledons have leaves with parallel veins and
the parts of their flowers come in threes. Examples of monocotyledons
include:
palms
orchids
grasses
Eudicotyledons
Sunflower plants are eudicotyledonsThe seeds of eudicotyledons each
contain two embryonic leaves. Eudicotyledons have leaves with
branching veins, and the parts of their flowers come in fours or fives.
Examples of eudicotyledons include: oak trees, dandelions.
Keysandidentification
Keys are used to identify different species. A key will usually ask
questions based on easily identifiable features of an organism.
Dichotomous keys use questions to which there are only two answers.
They can be presented as a table of questions, or as a branching tree of
questions.
7. Characteristicsoflivingorganisms
Living organisms have the following characteristics in common:
. Movement - they can move and change their position.
. Reproduction – they can make more of the same kind of organism as
themselves.
. Sensitivity – they can detect or sense stimuli and respond to them.
. Growth - they can permanently increase their size or dry mass by
increasing the number or size of their cells.
. Respiration – they can create chemical reactions that break down
nutrient molecules in living cells to release energy.
. Excretion – they can excrete toxic materials, waste products of
metabolism, and excess substances (note that excretion is not the
same as egestion).
. Nutrition - they can take in and absorb nutrients such as organic
substances and mineral ions. These nutrients contain the raw
materials or energy needed for growth and tissue repair.
The first letter of each of these characteristics makes up the
acronym ‘MRS GREN’. This is a good way of remembering them.
Living organisms can reproduce
8. Living organisms can also control their internal conditions, such as their
temperature or water content.
Animals
Animals are multicellular organisms – they consist of many cells that
work together. Examples of animals include mammals (such as humans)
and insects (such as houseflies and mosquitoes).
Animalcellstructure
The main parts of an animal cell are the nucleus, cell membrane and
cytoplasm.
Animal cells:
. do not have cell walls
. do not contain chloroplasts, so animals cannot carry out
photosynthesis
. may store carbohydrate as glycogen
9. Animals usually have nerves or nervous systems for coordination, and
they are able to move from place to place.
Plants
Plants are also multicellular organisms – they consist of many cells
that work together. Examples include cereals (such as maize), and peas
and beans.
Plantcellstructure
Plant cells contain the same parts as animal cells. They also have some
additional ones:
. chloroplasts
. cell wall made of cellulose
. permanent vacuole
Otherfeaturesofplants
Plant cells contain chloroplasts so plants can carry out
10. photosynthesis. They store carbohydrates as starch or sucrose.
Cellstructure
Animal cells and plant cells have certain structures in common.
Structure Function
Cytoplasm Where most of the chemical
reactions happen
Nucleus Contains genetic material
which controls the cell’s
activities
Cell
membrane
Controls the movementof
substances in and out of the
cell
Mitochond
ria
Where most energy is
released in respiration
Ribosome
s
Where protein synthesis
happens
Plant cells have additional structures.
Structure Function
Chloroplast Absorb light energy for
photosynthesis
Cell wall Strengthens the cell and
supports the plant
Permanent
vacuole
Filled with cell sap to help
keep the cell turgid
Animal cells may also have vacuoles, but these are small and
temporary.
11. Fungi
Mushrooms, toadstools and moulds (such as Mucor) are multicellular
fungi. Yeast is an example of a single-celled fungus.
Fungalcellstructure
Fungal cells have a cell wall made of chitin (remember that plant cell
walls are made of cellulose).
12. A yeast cell
Athlete’s foot, caused by a fungus
Some fungi are pathogens, for example the fungal infection which
causes athlete’s foot.
Fungalstructure
13. A multicellular fungus showing rounded spore cases and spores and
thread-like hyphae
Multicellular fungi, such as Mucor, are organised into a mycelium -
which is made from thread-like structures called hyphae.
The hyphae contain many nuclei.
Fungalnutrition
Fungi cannot carry out photosynthesis. Instead they use saprotrophic
nutrition. They secrete enzymes onto their food so that digestion
happens outside the fungal cells. They then absorb the digested organic
products.
Fungal cells may store carbohydrate as glycogen (remember that plant
cells store carbohydrate as starch).
Bacteria
Rod-shaped Escherichia coli (E.coli) bacteria,commonly found in the
intestines of animals
Bacteria are microscopic single-celled organisms. Examples of
14. bacteria include:
. Lactobacillus bulgaricus (a rod-shaped bacterium used to
make yoghurt from milk)
. Pneumococcus (a spherical bacterium that acts as the
pathogen that causes pneumonia)
Bacterialcellstructure
Bacterial cells have a cell wall made of polysaccharides and proteins.
They do not have a nucleus, but instead they have a circular
chromosome of DNA. They may also have small extra circles of DNA
called plasmids.
Otherfeaturesofbacteria
Some bacteria can carry out photosynthesis, but most bacteria feed
from other organisms (living or dead).
Some bacteria are pathogens, for example Pneumococcus (which
15. causes pneumonia).
Protoctists
Protoctists are microscopic single-celled organisms.
Some protoctists, such as Amoeba, have features like an animal cell.
Others, such as Chlorella, have chloroplasts and are more like plants.
Some protoctists are pathogens. For example, Plasmodiumis, the
pathogen that causes malaria.
Viruses
Viruses are very small particles capable of infecting every type of living
organism. They are parasitic and can only reproduce inside living cells.
For example:
. the tobacco mosaic virus – this stops chloroplasts forming
in tobacco plants and causes the tobacco leaves to become
discoloured
. the influenza virus – this causes flu
. HIV (human immunodeficiency virus) – this causes AIDS
Virusstructure
Virus particles have a variety of shapes. They do not have a cellular
structure. Instead, they have a core of genetic material surrounded by a
protein coat. Their genetic material can be DNA or RNA, but not both.
16. The structure of a hepatitis virus
Cells,tissuesandorgans
In order of increasing complexity, multicellular organisms consist of:
organelles → cells → tissues → organs → organ systems
Structure Description
Organelle Cell structure that is specialised to carry out a particular functi
Job
Cell Basic structural and functional unit of a living organism
Tissue Group of cells with similar structures, working together to perfo
shared function
Organ Structure made up of a group of tissues, working together to
perform specific functions
Organ system Group of organs with related functions, working together to pe
body functions