Which of the following was critical for the adaptation of reptiles to terrestrial ecosystems?

Name: Which of the following was critical for the adaptation of reptiles to terrestrial ecosystems?
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Question

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The amniote egg allowed reptiles to lay eggs on land, which protected the developing embryo from drying out and allowed for the colonization of terrestrial ecosystems. Four legs, exoskeletons, and endoskeletons are not unique to reptiles and were not critical for their adaptation to terrestrial environments.

Which of the Following Was Critical for the Adaptation of Reptiles