Charles Darwin (sep 18, 1787 – jan 1, 1882)

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Charles Darwin(1809-1882): His most famous work, On the Origin of Species, explains the theory of evolution by natural selection, providing numerous supporting examples. Darwin believed that all of life on earth had descended from a common ancestor, whose offspring could vary slightly from the previous generation. Successive generations of life took part in a struggle for existence in which the best adapted variations survived to seed new generations. Less well adapted variations became extinct. He also discovered adaptive radiation, which is the diversification of a group of organisms into forms filling different ecological niches when he observed the different kinds of finches and tortoises on the Galapagos Islands.

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