Question

what is class mammalia

Answer 1

Mammals (formally Mammalia /məˈmeɪli.ə/) are members of a class of air-breathing vertebrate animals characterized by the possession of hair, three middle ear bones, and mammary glands functional in mothers with young. Most mammals also possess sweat glands and specialized teeth, and the largest group of mammals, the placentals, have a placenta which feeds the offspring during gestation.

- Just copied it from wikipedia " http://en.wikipedia.org/wiki/Mammal " but if you want more info feel free to ask :)