what are Mammals?

Q)What are mammals?
A) Mammals are vertebrate animals constituting the class Mammals and characterized by the presence of mammary glands which in females (and sometimes males produce milk for feeding (nursing) their young, a neocortex (a region of the brain ) , fir or hair, and three middle ear bones.These characteristics distinguish them from reptiles and bird, from which they diverged in the late Triassic, 201-227 million years ago . There are around 5,450 species of mammals.

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