Suppose That Several Flies of a Population That Previously Fed

question 56

Multiple Choice

Suppose that several flies of a population that previously fed on blueberries start to feed on honeysuckle. Due to genetic differences that accumulate as the flies adapt to feeding on honeysuckle, these "honeysuckle" flies eventually breed earlier than the ancestral flies. This change most likely represents an early stage of speciation brought about by

• A) a geographical barrier.
• B) an ecological barrier.
• C) genetic drift.
• D) adaptive radiations.

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