Great transformations

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This video focuses on some of evolution's most important changes--among them the development of the four-limbed body plan, the journey of animal life from water to land, the return of mammals to th...

This video focuses on some of evolution's most important changes--among them the development of the four-limbed body plan, the journey of animal life from water to land, the return of mammals to the sea, and the emergence of humans. Driven by a combination of opportunism and a genetic "toolkit," these great transformations define the arc of evolution and triggered the earth's incredible diversity.

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