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WAEC Biology 2012 Question 20

Question 20

Homeostasis

The hair on the human skin will stand erect when the person is

  1. A.in an air-conditioned room.
  2. B.strolling in the sun.
  3. C.taking a hot drink.
  4. D.doing strenuous exercise.
Show the answer and explanation

Answer: A (in an air-conditioned room.)

Explanation

In the cold, erector muscles raise the hairs to trap a layer of air that reduces heat loss.