In some instances, environmental change causes a situation where one phenotype is favored for a period of time and then a different phenotype is favored for a period of time. This oscillating selection is most likely to lead to
A. a population with decreasing levels of genetic variation.
B. an increasing population to maintain genetic variation.
C. an increase in point mutations.
D. the maintenance of genetic variation in the population.
E. the elimination of rarer genotypes because of directional selection.
Answer: D
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