NEET BIOLOGY

Detailed explanation-1: -Reptiles. Reptiles were the first amniotes and the first organisms to develop internal fertilization.

Detailed explanation-2: -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.

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. They also provide it with a rich, fatty food source (the yolk).

Detailed explanation-4: -The amniotes-reptiles, birds, and mammals-are distinguished from amphibians by their terrestrially adapted egg, which is protected by amniotic membranes.