Savannahs are:

$A$ physical place or set of environmental conditions around the organism to which it must adapt to survive and prosper is . . . . . . .

Which of the following are the dominant plants of the cold desert?

Assertion : Biotic community has higher position than population in ecological hierarchy.
Reason : Population of similar individuals remains isolated in the community.

Some animals can change their body temperature according to the ambient temperature,then they are simply . . . . . . .

$A$ kind of similarity found in polar regions and high altitudes is