List the characteristic features of class Mammalian.
The characteristic features of class Mammalian are: - (i) These animals are warm-blooded (homeotherms), hairy, and have mammary glands, which produce milk. (ii) Oil glands and sweat glands are present in their skin. (iii) The skull is dicondylic, i.e., it has two occipital condyles. (iv) The lungs are responsible for respiration. (v) The heart has four chambers.
