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<li>Biologists have noticed that most human beings enjoy sex. How would they explain this in evolutionary terms? (p. 435)
A. If sex were not enjoyable, the human species would have died out.
B. Early humans who enjoyed sex most had the most babies.
C. Only body structures evolve, not behavior, so enjoyment cannot evolve.
D. This was due to a random mutation, so it did not affect evolution.
E. Biologists are baffled by the phenomenon of sex.
–from Campbell’s Online Chapter 22 Quiz</li>
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