During normal climatic conditions with regular rainfall, the average beak depth for a population of finches was 6.8mm. Researchers found that after a drought, average beak depth increased to 8.8mm. Birds with deep beaks (>9mm)  were better able to eat large, hard seeds. Small hard seeds were also available after the drought, but could only be eaten by birds with shallow beaks (<7mm). Choose the graphical representation and term that best represents what would happen in the post-drought finch population if both types of seeds continue to be available.

A.
balancing selection.

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B.
stabilizing selection.

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C.
negative frequency-dependent selection.

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D.
disruptive (diversifying) selection.

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E.
directional selection.

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Answer: D

Biology & Microbiology

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