Darwin's revolutionary offering of the theory of evolution is captured here, in one of the most important (and, to some, controversial) biological texts of all time. His theory can be distilled to two simple points: that diverse groups of animals evolve from one or a few common ancestors, and the mechanism by which this evolution takes place is natural selection. From the Galapagos Islands to Ancient Egypt to one's own back yard, Darwin points to case after case of evolutionary theory in action.

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