The different beak shapes of Darwin's finches on the Galapagos Islands reflect
- A. adaptation to different food sources
- B. random accidents with no cause
- C. differences in the age of the birds
- D. infection by different parasites
Explanation
Seed crackers, insect pickers and cactus feeders each carry a beak matched to their food, descendants of one ancestor that radiated into vacant niches. The pattern shows natural selection shaping a structure to its use.
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