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Which of the following will lead to a change in the allele frequencies of a population?
Members of a population of honeycreepers (birds) are localized to one particular island in Hawaii.
Fruit flies in a population mate at random.
A population of chipmunks in a forest is separated from other populations of chipmunks by a large grove of trees.
A population of rats numbers in the hundreds of millions.
A population of squirrels is sharply reduced in size by a parasite.