The Descent of Man
Charles Darwin's The Descent of Man, and Selection in Relation to Sex (1871) extends the argument of On the Origin of Species to humanity itself. In its first part Darwin marshals evidence that man is descended from earlier animal forms; in the larger remainder he develops the theory of sexual selection—competition for mates and mate choice—as a force shaping the differences between the sexes throughout the animal kingdom and in the human races. Controversial and far-reaching, it placed human beings squarely within the evolutionary story and grounded the study of human origins, emotion, and morality in natural science.
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