Vertebrates, Fishes, Amphibians and Reptiles
Science

An egg with a shell and membrane to protect the embryo, like an egg laid by birds, reptiles, and mammals
Amniotic egg
An egg with a shell and membrane to protect the embryo, like an egg laid by birds, reptiles, and mammals. Amniotic egg. An amniotic egg is a type of egg that provides a protective environment for the developing embryo, allowing animals to live and reproduce on land.

A flexible, rod-like structure that runs along the upper part of a chordate’s body
Notochord
A flexible, rod-like structure that runs along the upper part of a chordates body. Notochord. The notochord is a supportive structure that helps define the body axis in developing animals like fish and amphibians.