Question

Write a note on mammals.

Answer 1

1. Mammals are -warm-blooded animals.
2. The skin is covered with hair. It also bears sweat and sebaceous (oil) glands.
3. The body is divisible into head, neck, trunk and tail.
4. Females have mammary glands, which secrete milk for feeding the young ones.
5. The external ear or pinnae is present.
6. Heart is four-chambered and they breathe through lungs.
7. Except egg-laying mammals (Platypus, and Spiny anteater), all other mammals give birth to their young ones (viviparous).
8. The placenta is the unique characteristic feature of mammals, e.g Rat, Rabbit, Man.