Biology

The correct answer is: B.Galápagos finches.

Explanation:

Darwin observed the Galápagos finches during his voyage on the HMS Beagle. He noted that different species of finches on different islands had distinct beak shapes that were adapted to their specific environments, which supported his theory of gradualism. Over time, these finches gradually evolved from a common ancestor, with small, incremental changes leading to adaptations suited to their environment.

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