Species that can tolerate a wide range of salinity are called $............$.

Two or more species occupying identical or overlapping areas are known as

Populations of different species living together in a common habitat form which of the following?

Below is the diagrammatic representation of the response of organisms against temperature. Find out the correct match.

How many of the following statements are correct about niche?
$i$. It denotes the functional role played by an organism.
$ii$. It deals with the flow of energy from one organism to another.
$iii$. As soon as a niche is left vacant,other organisms fill that position.
$iv$. The same niche is shared by two or more species.
$v$. Organisms living in the same habitat differ in their niches.

The biome characterized by a layer of permafrost is known as: