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Simply put he went on a long sea voyage and, though not at first, took his observations to explain descent with modification by the theory of evolution by natural selection. He preformed many experiments once home, frequented artificial selective breeders of animals for ideas on directed change in domestic animals and wrote " one long argument ' after 20 years of study and experimentation and thought on the species that accumulated into his book On The Origin of Species.

Google talkorigins.org for much about Charles Darwin. Wiki has much info also.

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13y ago

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