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T-cell have a life of

A mammal with social life having different castes is

Assertion :- The rate of appearance of new forms is liked to the life cycle or the life span of organisms. Reason :- The organism with short life span have ability to produce more progenies in shorter time and that have chance to more expsure with nature.

In an open circuit and in a short circuit we have

In cold climate, the animals have short tail, shorter limbs and ears, this is called :