Darwin's Theory of EvolutionEvolution, as understood by biologists, is the change through time that occurs in populations of organisms in response to changing environments. The changes, coded in the molecules of DNA, are transmitted from generation to generation and over the history of the Earth have resulted in progressively more complex life forms. The name of Charles Darwin and his theory of natural selection are inexorably attached to evolution and, together with the mechanisms of genetics, form the basis of the modern theory of evolution. Simplifying and paraphrasing from Darwin's book, On the Origin of Species by Means of Natural Selection, and adding current interpretations, the main points of his theory are: all life came from one or a few kinds of simple organisms; new species arise gradually from preexisting species; the result
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