Similarity of bone structure in the forelimbs of many vertebrates is an example of __________.

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Similarity of bone structure in the forelimbs of many vertebrates, such as whales, bats, cheetahs, and humans, is a classic example of homologous organs. These organs share a common anatomical plan and embryonic origin but have been modified to perform different functions in different animals, such as swimming, flying, running, and grasping. This phenomenon indicates divergent evolution, where a common ancestral structure has evolved in different directions to adapt to various environmental needs. Answer: homologou