Question

What two features do mammals have that other vertebrates do not have

Answer 1

Among the features that distinguish them from the other amniotes, the reptiles and the birds, are hair, three middle ear bones, mammary glands in females, and a neocortex (a region of the brain). ... All female mammals nurse their young with milk, which is secreted from special glands, the mammary glands.

Answer 2

Among the features that distinguish them from the other amniotes, the reptiles and the birds, are hair, three middle ear bones, mammary glands in females, and a neocortex (a region of the brain). ... All female mammals nurse their young with milk, which is secreted from special glands, the mammary glands.