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20. Artificial selection was used on corn to produce a single strain of corn with increased growth rates and greaterresistance to a fungus. Although farmers have continued to select for these traits, the productivity of this strain is nolonger increasing. This suggests that:A) the population size has been decreasing.B) artificial selection is not as strong as natural selection.C) the corn population has been weakened by artificial selection.D) all or most of the natural variation for these traits has been eliminated.E) long-term disruptive selection may lead to speciation.
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