Which organisms on the Galápagos Islands were most important in the development of Darwin's theory of evolution by natural selection?

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The finches on the Galápagos Islands were the most important organisms in the development of Darwin's theory of evolution by natural selection. These finches showed significant variation in beak size and shape, which Darwin perceived as adaptations to different types of food. This observation led Darwin to propose that natural selection drives evolution by favoring individuals with characteristics that are best suited to their environment.

Which Organisms on the Galápagos Islands Were Most Important in the Development