A series of forest fires burned through the valleys and most of the established population of butterflies were destroyed. The butterflies had been mostly cream colored with black spots. Some members of the population were cream colored with brown spots. After a few years the population had returned to its previous level but now most of the butterflies are cream with brown spots. Which mechanism of evolution is described in the scenario above?
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A series of forest fires burned through the valleys and most of the established population of butter...
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