What kind of animals conserve energy with their hair or fur?\nOptions:\n- (A) fur\n- (B) bears\n- (C) mammals\n- (D) sweating\n- (E) frogs\n- (F) cactus\n- (G) goats\n- (H) humans Let's solve this problem gradually.

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Mammals conserve body heat with their hair or fur. Basically, heat is energy. Mammals conserve energy with their hair or fur. So the final answer is (C).
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