The organisms examined by Darwin on the Galápagos Islands that were most important in his development of the theory of natural selection were

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Darwin's observation of the variations in beak size and shape among the finches he observed on different islands of the Galápagos was a key factor in his development of the theory of natural selection. The differences in beak morphology allowed the finches to specialize in feeding on different types of food, which Darwin theorized was the result of adaptation to the available resources on each island.

The Organisms Examined by Darwin on the Galápagos Islands That