amniotic eggs were the most important adaptation that enabled the uncoupling of reproduction and the need for an aquatic habitat.
What is an amniotic egg?
- An air-breathing egg with extraembryonic membranes and a shell.
- These allowed for gas interaction with the surrounding environment while keeping the amniotic embryo in a private pond during development.
- 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.
- 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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