Which adaptations allowed reptiles to complete their life cycles on land?

Question

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An amniotic egg contains protective layers that prevent water loss and allow the embryo to develop on land. This adaptation allowed reptiles to complete their life cycle on land rather than returning to water for reproduction. Lungs, ectothermic metabolism, and four legs are also adaptations of reptiles, but they do not directly enable completion of their life cycle on land.

Which Adaptations Allowed Reptiles to Complete Their Life Cycles on Land