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Reptiles evolved from an ancestor of amphibians that developed a(n) ____.

Reptiles evolved from an ancestor of amphibians that developed a(n) ____.

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T.C. S. | Graduated with Bachelor of Science Degree in Biology from JMU in 2012Graduated with Bachelor of Science Degre...
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There may be multiple characters that can distinguish amphibians from reptiles.  Most cladograms show that reptiles, birds, and mammals (going up the tree) possess amniotic eggs whereas amphibians do not.  Therefore, reptiles evolved from an ancestor of amphibians that developed amniotic eggs.