Which one of the following is one of the characteristics of a biological community?

Penguins are found in:

Give scientific reasons: Thermoregulation is more effectively achieved in larger animals than in smaller ones.

Given below are two statements:
Statement $I$: Stenohaline animals tolerate a wide range of salt concentration.
Statement $II$: Euryhaline animals are capable of handling a narrow range of salt concentration.
In the light of the above statements,choose the most appropriate answer from the options given below:

Tiny free-living animals on the surface of water constitute:

In plants,which of the following explains their functions and characteristics?