Human, dog, bird, and whale arm structures.

By Волков Владислав Петрович CC BY-SA 4.0, from Wikimedia Commons

The picture above shows the similarities between a few animals' forelimb structures. Each animal uses their forelimbs differently, yet they all have the same basic structure. Why could this be?

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Type a concept, like “slope” or “photosynthesis”.

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