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

Assertion: Birds and mammals are warm-blooded (homoiothermous) animals. Reason: Aves and mammals are able to maintain a constant body temperature.

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

Assertion.Birds are uricotelic. Reason. Birds lack urinary bladder.

Assertion : Birds have no mammary gland. Reason : Pigeonds secrets 'pigeon's millk'

Aves and mammals are warms blooded animals. Give reason.

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

Assertion : Vitamins are essential for healthyl life. Reason : Vitamins regulate metabolism

Assertion: Interphase is resting stage. Reason: The interphase cell is metabolically inactive.