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During Charles Darwin’s journey on the HMS Beagle from 1831 to 1836, he spent five weeks on the Galapagos Islands off the coast of Ecuador, South America. On the Galapagos Islands, Darwin encountered thirteen new species of finches that had never been identified. From his observations of these new species of finches, he conceived a new theory of evolution.

What evidence did Darwin use to explain the differences in appearance between all thirteen species of finches that lead to speciation?

A

Beak size and shape of each different finch species.

B

Food consumed by different species of finches was based on geographic location (which island the finch lived on).

C

Wing span of finches determined if they could move to a different island to search for food.

D

Camouflage rates were determined by feather color.

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