amniotic eggs was the most important adaptation that enabled the uncoupling of reproduction and the need for an aquatic habitat
an air-breathing egg with extraembryonic membranes and a shell. During development, they kept the amniote embryo in a private pond and facilitated gas exchange with the environment.
The chicken egg seen above is an amniotic egg because the embryo develops inside the shell while the egg develops and hatches after amniotic egg development. the kind of egg laid by prototherian (egg-laying) mammals (amniotes), birds, and reptiles in which the embryo develops inside an amnion. The egg's shell is either made of calcium or is made of leather.
Amniotic eggs are found in mammals, reptiles, and birds. Since amphibian eggs lack an amnion, laying them on land would cause them to dry out, thus instead, amphibians lay their eggs in water.
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