evoluton
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| Evolution | the process by which modern organisms have descended from ancient organisms
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| Charles Darwin | contributed lots to understanding of evolution.
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| Natural variation | differences among individuals of a species
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| Artificial selection | also called selective breeding. It occurs when humans select useful natural variations and produces organisms that look very different from their ancestors.
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| Adaptation | any inherited characteristic that increases an organism's chance of survival
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| Natural selection | survival of the fittest
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| Evidence for evolution | Found in the fossil record, geographic distribution of living species, homologous structures of organisms, and similarities in early development.
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| Fiches on Galapagos | descended w/ modification from a common ancestor
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| How are there similar but unrelated species? | They came from different ancestors but adapted similarly to their similar conditions.
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| Homologous structures | structures that have different mature froms but develop from the same ebryonic tissues
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| Vestigal organs | so reduced in size they are just vestiges, or traces, of homologous organs in other species
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| Darwin's Theory | Still upheld by research. There is variation in nature, more organisms are produced than can survive, there is a struggle for existance, species change over time.
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