Question

on his visit to the galapagos islands, darwin observed a variety of similar birds that lived either on the ground or in trees. later, experts classified these birds as finches. darwin had identified 14 distinct finch species, each different from one another and different from finch species that lived on the mainland.
the diagram shows four of the galapagos finches, each of which has a different type of beak. the insets compare the beaks to a type of tool.
according to darwins theory of evolution, each beak shape is the result of the process of natural selection. which statement is most useful for explaining why different beak shapes evolved in each of the four finch species?
a. each finch species evolved from a different ancestor, each with a unique beak shape.
b. ancestors of the finch species mated with other bird species that had variable beak shape.
c. the common ancestor of the finch species displayed the same four beak shapes of its descendants.
d. the food supply selected for beak shape as the finch species descended from a common ancestor.

Explanation:

Answer:

D. The food supply selected for beak shape as the finch species descended from a common ancestor.