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Those organs which have the same basic structure (or same basic design) but Different functions are called homologous organs. The homologous organs of Different animals provide evidence for evolution.
For example: the forelimbs of a man, a lizard (reptile), a frog (amphibian), a bird and a bat (mammal) seem to be built from the same basic design of bones but they perform different functions. The forelimbs of a Human (man) are used for grasping, the forelimbs of a lizard are used for running.