Organisms occupying similar ecological niche but different geographical areas of distribution are called as

In summer,when the outside temperature is higher than our body temperature,we sweat profusely. The resulting evaporative cooling,similar to what happens with a desert cooler in operation,brings down the body temperature. In winter,when the temperature is much lower than $37^{\circ}C$,we start to shiver,a kind of exercise which produces heat and raises the body temperature. These organisms are called:

Life history traits of organisms have evolved in relation to the constraints imposed by which of the following?

Given below are two statements.
Statement $I$: Habitat consists of numerous niches.
Statement $II$: Niche is an area where a species lives and prospers.
In the light of the above statements,choose the correct option.

The genus $Quercus$ is a dominant component in:

Give the differences between Hibernation and Aestivation.