Natural selection of Charles Darwin
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This document provides an overview of evolution and Charles Darwin's theory of natural selection. It discusses how evolution is both a fact, as organisms have changed over time as seen in the fossil record, and a theory explaining the mechanism of change. Darwin's observations of finches and tortoises on the Galapagos Islands led him to understand that organisms adapt to their environments over generations through natural selection, in which heritable traits that increase survival are passed on. His theory was supported by examples like the adaptation of peppered moths during the Industrial Revolution.
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Genetic variations are passed on through reproduction. Natural selection leads to evolution as organisms best adapted to their environment have a better chance of surviving and reproducing. Our understanding of evolution has changed over time from pre-Darwin beliefs that species did not change to Darwin's theory that organisms evolve from common ancestors through natural selection and adaptation to their environment. Evidence for evolution includes homologous structures between species, vestigial organs, embryonic development, and the fossil record.
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Charles Darwin developed his theory of evolution by natural selection based on observations and evidence collected during his voyage on the HMS Beagle from 1831-1836. His theory proposed that (1) organisms vary between individuals, (2) favorable variations enable individuals to better survive and reproduce, and (3) over generations this process leads to the formation of new species. The document outlines Darwin's journey, the evidence and influences that led him to develop this revolutionary scientific theory of evolution.
darwin evolution ppt.pptx
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- Darwin observed related but distinct finch species in the Galapagos Islands, supporting the idea that isolated populations can evolve into new species over time through natural selection.
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Charles Darwin developed the theory of evolution by natural selection based on observations and evidence collected during his five-year voyage on the HMS Beagle. During the voyage, Darwin noticed variations in species between different geographic locations and discovered fossils that resembled modern species. Upon returning home, Darwin hypothesized that all life on Earth descended from common ancestors and that natural selection leads to gradual changes in species over many generations as individuals better suited for their environment are more likely to survive and reproduce.
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Charles Darwin developed the theory of evolution by natural selection based on observations and evidence collected during his voyage on the HMS Beagle. He noticed that species on different islands were well-adapted to their local environments, and that fossils resembled modern species, suggesting life had changed over time. Darwin proposed that individuals vary within a population, and that natural selection leads to the survival of individuals best suited for their environment, causing species to change gradually over many generations through descent with modification.
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Charles Darwin developed the theory of evolution by natural selection based on observations and evidence collected during his voyage on the HMS Beagle from 1831-1836. He noticed that species varied between geographic locations and that fossils showed extinct species similar to modern ones. Upon returning home, Darwin hypothesized that species evolve over generations through natural selection of inheritable traits that aid survival and reproduction in the local environment. He published his theory in On the Origin of Species in 1859.
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- Charles Darwin developed the theory of evolution by natural selection based on observations he made during his voyage on the HMS Beagle from 1831 to 1836.
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Natural selection of Charles Darwin
- 2. Let us Pray…
- 3. What is Evolution? Is a slow process of change by which organisms have acquired their distinguishing characteristics; it has been going on since the Earth was formed billions of
- 4. “Evolve” Means to Change Over Time • The notion that life on Earth has changed over time is quite old • To be considered science, this notion requires
- 5. Is evolution a fact or a theory? We could say that it is both. It is a fact, for example, that living organisms have changed over time. These changes, which include the evolution of major groups of plants and animals, are documented in fossil records and were recognized by the
- 6. Charles Darwin’s On The Origin of Species provided a convincing theory as to how these changes occurred. In this respect, evolution is indeed a theory, a collection of carefully reasoned and tested hypothesis about how evolutionary change
- 7. How about Natural Selection? The theory that states that those organisms best adapted to their environment have a better chance of surviving and reproducing.
- 8. Okay!!! Let’s have a Sojourn to Galapagos Islands with Darwin… Hooray!!!
- 9. THEORY OF NATURAL SELECTION Charles Robert Darwin (1809 - 1882) proposed and formulated the process of evolution in his book, On The Origin of Species by Means of Natural Selection published in 1859 after taking trip around the
- 10. His theories stated that common descent does occur and that natural selection results in adaptation to the environment. Natural Selection is the mechanism he proposed for how adaptation comes about. It is caused by environmental selection of
- 11. The Voyage of the Beagle: Ports of Call Noted that populations of organisms were slightly different from place to place Each group was modified to their specific environment
- 13. What did Darwin find at the Beagle? The finches on each island in the Galapagos had different types of beaks.
- 15. What did Darwin find at the Beagle? The tortoises on each island in the Galapagos had different types of shells.
- 16. With those observations Darwin found out that: 1.Organisms had a common ancestor, but had adapted to their particular environments and changed over time. 2. Darwin published his
- 17. Natural Selection • For natural selection to occur, there must be at least two varieties of a species. • For example: the peppered moth
- 18. Peppered Moths • At the beginning of the Industrial Revolution in England, coal burning produced soot that covered the countryside in many areas
- 19. What do you think happened?
- 20. Evolution/Natural Selection • White moths became easier to see, while the black moths became harder to see. The black moths were more likely to survive and pass on the gene for dark color to their offspring. • Over time, the black
- 21. Development of Evolutionary Theory Darwin Concluded: • Physical traits and behaviors enable organisms to survive and reproduce (called Fitness ) • Fitness results from adaptations –Structural (body structures) –Behavioral (protection, predation, mating) –Functional (chemicals produced by
- 22. Let’s have a Review with Haik!!!
- 23. Group Activity Directions: Divide the class into two. Each group will formulate a summary of Darwin’s Natural Selection in a form of news story and present it to the class thru News Casting, Each group will select at least 2 reporters to do the news casting.
- 24. WILDCATS NEWS HEADLINES Charles Darwin’s Natural Selection!