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Which of the following scenarios exemplifies genetic drift?


An unusually cool spring causes a species of firefly to begin reproducing in July rather than the normal mating period of June.


An earthquake kills 90% of all the long-flashing fireflies in a population of long-, medium-, and short-flashing fireflies.


A long-flashing firefly migrates from its original population to a new population comprised entirely of medium- and short-flashing fireflies.


Short-flashing fireflies are more difficult to hunt and are eaten less often by predators than medium- and long-flashing fireflies.

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