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The bones of forelimbs of whale, bat, ch...

The bones of forelimbs of whale, bat, cheetah and man are similar in structure, because

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one organism has given rise to another
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What is common in whale, bat and rat ?

The forelimbs of a frog, a bird and a man show the same basic design (or basic structure) of bones. What name is given to such organs ?

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