Animals floating or swimming in the surface film of water are called:

Which of the following organisms can ensure constant body temperature and osmotic concentration by physiological and behavioural changes?

The physical space occupied by the organism is called its . . . . . . niche.

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

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

Identify the organism based on the following characteristics:
- It has the ability to concentrate its urine.
- It meets its water requirements from internal fat oxidation.
- It is found in the American desert.