Need A Full Stated Answer.

Part A: Explain why the average beak thickness changed between wet and dry years.

Part B: Explain how beak thickness would have changed during the next ten years (1986 to 1996, if those years were wet years.

Answer part A)

During the wet years, small seeds are produced which are easy for the birds to breakdown. However, in the dry years, large and tough seeds are produced which cannot be broken down by small beaks of the birds.

The graph illustrates that during the wet years, the thickness of the beaks of the birds reduced as there were more, small seeds to feed on. During the dry years, the thickness of the beaks increased as the seeds became tough.

Answer part B)

If the next ten years turns out to be wet years, then through evolution the thickness of the beaks will continue to reduce as these years will support the birds which have small beaks.

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