What keeps mammals warm?\nOptions:\n- (A) evaporation\n- (B) Animal fur\n- (C) staying warm\n- (D) sweating\n- (E) They have thick fur\n- (F) with their fur\n- (G) a layer of fat\n- (H) Veins and arteries.
Hmmm, let me think. I don't want to be wrong, so I got to be careful.
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Mammals have a layer of fat under the skin to help insulate the body. Glass insulation keeps beverage warm for hours. Mammals have a layer of fat under the skin to keep them warm. The answer: (G).
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