Question 20 (5 points) A major contributing factor for the reduction in the numb

Question

Question 20 (5 points)

A major contributing factor for the reduction in the number of medium ground finches on Daphne Major Island was attributed to __________________.

Question 20 options:

reduction in the availability of safe drinking water

inability of many medium ground finches to feed on small seeds

inability of many medium ground finches to feed on large, hard seeds

predation by other animals on the island

reduction in the availability of safe drinking water

inability of many medium ground finches to feed on small seeds

inability of many medium ground finches to feed on large, hard seeds

predation by other animals on the island

Explanation / Answer

A major contributing factor for the reduction in the number of medium ground finches on Daphne Major Island was attributed to the inability of the many medium ground finches to feed on large, hear seeds. The medium ground finches feed on small seed. However, after a drought in 1977 destroyed all majority of small seeds in that area, the survival of medium ground finches came to a risk. As can be seen in the graph above, the beak size of surving finches had increased after the period of drought. This is because larger beak favoured feeding of hard and large seeds.This is a clear evidence for the natural selection of bill size being caused by the availability of seeds.  

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