The most important adaptation that enabled the uncoupling of reproduction and the need for an aquatic habitat ---- amniotic eggs
The amniotic egg:
An air-breathing egg characterized by a shell and extraembryonic membranes. These enclosed the amniote embryo in a private pond during its development and mediated gas-exchange with the external environment.
What organisms have amniotic eggs?
Birds, reptiles, and mammals have amniotic eggs. Because amphibian eggs don't have an amnion, the eggs would dry out if they were laid on the land, so amphibians lay their eggs in water.
Do humans have an amniotic egg?
Amniote embryos, whether laid as eggs or carried by the female, are protected and aided by several extensive membranes. In eutherian mammals (such as humans), these membranes include the amniotic sac that surrounds the fetus.
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