Tetrapod Fossil Discovery: Fins to Limbs

Fossil Discovery Picture: Fins to Limbs (National Geographic News)
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The arm bone of the new creature is shown alongside the bone's equivalent in a fish and in a human. By 365 million years ago, this bone had evolved to support an amphibian limb instead of a fish fin, according to scientists.

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Image courtesy Kalliopi Monoyios/Science
 
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