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Whales retain a vestigal pelvis and femur disconnected from the spine--a remnant of their time on land.
Whales retain a vestigal pelvis and femur disconnected from the spine--a remnant of their time on land.

Natural Selections: Convergent Evolution

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We think of evolution as moving in a linear progression from the sea to the land. But some creatures, such as whales and dolphins, clearly adapted to the land, then returned to the sea. Dr. Curt Stager and Martha Foley talk about convergent evolution.

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