Assertion (A) : Very small animals are rarely found in Polar Regions.
Reason (R) : Small animals have a smaller surface area relative to their volume

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Both (A) and (R) are true and R explains A.

Both (A) and (R) are true and R does not explain A.

(A) is true but (R) is false

Both (A) and (R) are false

answer is C.

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Detailed Solution

Small animals have a larger surface area relative to the volume.

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.

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