Heat loss or heat gain depends upon the surface area of the organism's body. Explain with the help of a suitable example.

Explanation

Heat loss or heat gain is a function of surface area since small animals have a larger surface area relative to their volume, they tend to lose body heat very fast when it is cold outside, then they have to expend much energy to generate body heat through metabolism. This is the main reason why very small animals are rarely found in polar regions.