Explain how the amniotic egg is an adaptation that helps reptiles live on land.

Question

Explain how the amniotic egg is an adaptation that helps reptiles live on land.

Answer 1

Sorry, I not quite sure what you mean. The egg is laid on land because it is too heavy and wouldn't survive in water.

Answer 2

"Evolution of eggs with a water-impermeable amniotic membrane surrounding a fluid-filled amniotic cavity permits embryonic development on land without danger of dessication."

http://www.mun.ca/biology/scarr/Amniotic...

Basically the hard shell around protects the eggs of land animals from drying up, while amniotic sac cushions the embryo and acts like a shock absorber. Together it keeps the nutrients inside the egg and protects the baby. By contrast, you see amphibians and fish laying eggs without a hard shell because they are laid in WATER, so they will not dry up. Other defenses such as a foamy top layer, or sheer number of eggs increases chances of survival.