Due to a extended 5 year drought the seeds became much harder than they were previously which graph would represent how the bird population would change over these years

Graph A

Explanation:

With harder seeds, birds will need larger beaks in order to crack the seeds. The birds with smaller beaks won't be able to crack the seeds and will die because they can't eat anything. Graph A is the only one that shows a distinct increase in bird beak size.

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