Which observation(s) of the medium ground finch (Geospiza fortis) by Peter and Rosemary Grant verify Darwin's selection hypothesis? Check all that apply.
A. Offspring were similar to parents in beak size and shape.
B. Considerable variation existed in the beak size and shape of this finch.
C. Beak shape (depth) varied with the dryness of the year.
D. The medium ground finch showed assortative mating according to beak size and shape.
Answer: C
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