Sir Andrew Huxley—grandson of Darwin’s great defender, Thomas Huxley—describes Darwin’s motivations, discoveries, and search for a logical theory to explain his observations of both geological and biological evidence in South America, focusing on Darwin’s importance as the first to present strong, scientific evidence for descent with modification and to posit a plausible mechanism for its occurrence, namely natural selection. (26 minutes)

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Part of the Series : The Evolution of Darwin

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