Both droughts resulted in strong natural selection on medium ground finch populations and both droughts resulted in alteration to available food, which favored the survival of some medium ground finches over others. Thus, the correct option is A and B.
Natural selection is a natural process in which organisms that are more adapted to their environment survive and reproduce more than those that are not.
Darwin's Finches' beaks were picked for their beneficial adaptations over generations until they all branched off to become new species. These birds have distinct beaks than mainland finches, although being almost identical in every other way.
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