Assertion. Most mammals are viviparous.
Reason. They feed their young ones on their own milk.

A: Most mammals are viviparous R : They feed their young ones with their milk (A) A and R both are correct and R is correct explanation of A. (B) A and R are correct but R is not explanation of A. (C) A is correct and R is false. (D) A and R are false

Assertion :- Mostly mammals are viviparous. Reason :- Mammals having milk producing glands.

Assertion : The skull of baby chimpanzee is more like adult human skull than adult chimpanzee skull. Reason : Mammals are viviparous protected their unborn young inside the mother's body.

Assertion. Birds and mammals are endothermic. Reason. They generate heat by metabolism to keep warm.

Assertion : The first mammals were like shrews. Reason : When reptiles came down mammals took over this earth.

Assertion : Parasites produce fewer young ones . Reason : They have an easy life in their hosts .