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A medium ground finch's ability to survive often depends on its beak size primarily because:

A. Birds with bigger beaks are socially dominant and therefore get the best nest sites.
B. Beak size determines which seeds a finch can eat and how efficiently it can eat them.
C. Longer beaks make better weapons, which the birds use to defend themselves against predators.
D. Larger-beaked finches experience higher mating success.

Answer :

The beak size of a medium ground finch depends mostly on how it feeds and what it likes to eat. Therefore, the correct option is B.

The finch's ability to access and eat accessible food sources is essential to its survival. The broad bill gives the finch a considerable advantage in areas where these seeds are the main food source, enabling it to open and swallow a wide variety of seeds. The finches' ability to survive and reproduce depends on this adaptation.

The overall fitness of the bird may also be influenced by social dominance (option A), self-defense (option C), and mating success (option D), although these are not the main variables influencing beak shape in this context.

Therefore, the correct option is B.

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