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Evolution of tetrapods

Evolution of tetrapods. Amphibia through reptiles. The Crossopterygian fish, Eusthenopteron. Origin of lungs. A gill pouch that fails to open to the outside Carries vagus nerve into the chest Requires a major change in circulation.

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1.42k views • 58 slides

Adaptation

Adaptation. Natural Selection v Evolution. Evolution = observed change in organisms over historic and geologic time Natural selection = one hypothesized mechanism for change Has enormous body of supporting evidence. What is natural selection?.

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482 views • 19 slides

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