Distinguish between homologous and analogous organs, with one example of each.

Homologous organs have the same basic structure and embryonic origin but may serve different functions, as the forelimbs of a whale, a bat and a human do; they indicate divergent evolution from a common ancestor. Analogous organs differ in structure and origin but serve the same function, as the wings of a bird and of an insect do; they indicate convergent evolution.

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Explanation

Homology is the evidence for common ancestry; analogy is not.