Home Biology Organisms and Populations The animals such as shrews and hummingbirds …
Biology Organisms and Populations Single Correct MCQ
Published on: August 21, 2026

The animals such as shrews and hummingbirds have not evolved the mechanisms of thermoregulation because

A
they are found in warm regions
B
they are found in polar regions
C
thermoregulation is energetically expensive
D
they lack sweat glands

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The correct answer is:
C

Small animals like shrews and hummingbirds lose heat rapidly, and maintaining constant body temperature requires a lot of energy. Hence, thermoregulation is energetically very expensive for them.

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