Natural selection has favored the dark form of the peppered moth in areas subject to severe air pollution, perhaps because on darkened trees, moth-eating birds see them less easily. As pollution abated, the light forms increased in the population because
A. birds ate more light moths.
B. light moths had lower fitness than dark moths.
C. light moths were more genetically variable than dark moths.
D. light moths were able to produce more offspring than dark moths.
Answer: D
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