The first group to exhibit an amniotic egg was the

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The reptiles were the first group of animals to exhibit an amniotic egg, which allowed them to reproduce on land and avoid the need to return to water to lay eggs. Birds (Aves) evolved from reptilian ancestors and also lay amniotic eggs, but they came after the reptiles. Amphibians (B) do not lay amniotic eggs and instead lay their eggs in water. Osteichthyes (D) are fish and also do not lay amniotic eggs. Mammals (E) do not lay eggs at all and instead give birth to live young.

The First Group to Exhibit an Amniotic Egg Was the