NEET BIOLOGY

Detailed explanation-1: -The amnion is filled with amniotic fluid that provides the growing embryo with a stable fluid-filled environment. This enables amniotes to lay eggs on land, without the risk of the eggs getting dried up. Reptiles, birds and mammals are amniotes.

Detailed explanation-2: -The fluid in the sac keeps the embryo moist. 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. The larvae of most amphibians have gills and look like fish when they are born.

Detailed explanation-3: -Unlike amphibians, reptiles produce amniotic eggs (see Figure below). The shell, membranes, and other structures of an amniotic egg protect and nourish the embryo. They keep the embryo moist and safe while it grows and develops.

Detailed explanation-4: -Amniota, a group of limbed vertebrates that includes all living reptiles (class Reptilia), birds (class Aves), mammals (class Mammalia), and their extinct relatives and ancestors.

Detailed explanation-5: -The amniotes-reptiles, birds, and mammals-are distinguished from amphibians by their terrestrially adapted egg, which is protected by amniotic membranes.