Which of the following can explain the diversity of beak shapes in the finches Darwin observed in the Galapagos islands?
a. Different finch species settled on each island separately.
b. The finches likely descended from a common South American ancestor.
c. The finches purposefully evolved to better suit their environment, specifically their food supplies.
d. Finches migrated to the islands to which they would be better suited.
b. The finches likely descended from a common South American ancestor.
The different beak shapes in the Galapagos island finches is best explained by the idea that they descended from a common South American ancestor. Those who had beaks best suited for their unique environments were more likely to pass on their advantageous traits to their offspring, which over time, created a wide variety of beaks suited for different food sources.
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