A long-term study on guppies illustrates the effect of predation on life history traits. In this study, what occurred when guppies from streams with cichlids (which prey on larger guppies) were moved to streams with killifish (which prey on smaller guppies) ?
A) Guppies became larger in one generation.
B) Guppies became smaller in one generation.
C) Guppies became larger over several generations.
D) Guppies became smaller over several generations.
E) Guppies did not change size.
Correct Answer:
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