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Dangerous Idea?

Origin of Species, by Charles Darwin

Chapter IV:
Natural Selection; or
The Survival of the Fittest

Natural Selection — its power compared with man's selection — its power on characters of trifling importance — its power at all ages and on both sexes — Sexual Selection — On the generality of intercrosses between individuals of the same species — Circumstances favourable and unfavourable to Natural Selection, namely, intercrossing, isolation, number of individuals — Slow action — Extinction caused by Natural Selection — Divergence of Character, related to the diversity of inhabitants of any small area, and to naturalisation — Action of Natural Selection, through Divergence of Character and Extinction, on the descendants from a common parent — Explains the Grouping of all organic beings — Advance in organization — Low forms preserved — Convergence of character — Indefinite multiplication of species — Summary.

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