The leg bones of the first tetrapod (shown in the diagram below)are hypothesized to have evolved from bones in the

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The leg bones of the first tetrapod are hypothesized to have evolved from the fins of a fish. This is because such fins have certain bones that are similar in structure to the leg bones of tetrapods. Additionally, there is fossil evidence that supports the hypothesis that the first tetrapods evolved from fish.

The Leg Bones of the First Tetrapod (Shown in the Diagram