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Evolution
Reptile Amniotic Eggs
318 Million BCE
After about 320 million years, the next significant leap in egg evolution came with reptiles, which developed amniotic eggs. These eggs have a protective shell and specialized membranes to support development outside of water, enabling reptiles to lay eggs in terrestrial environments.
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(Plants | Animals > Cephlapods | Insects | Fish > Amphibians > Reptiles > Dinosaurs & Birds | Synapsids & Mammals)