Being cowards, we defeat natural selection under cover of philanthropy: being sluggards, we neglect artificial selection under cover of delicacy and morality.
There are no more uses of "natural selection" in the book.
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She argues that dreaming must serve a purpose or natural selection would have eliminated such a vulnerable state.
I was slightly stunned by this story, for I was not prepared to have an unlettered and untutored Eskimo give me a lecture, even in parable form, illustrating the theory of survival of the fittest through the agency of natural selection.