Fur is a fiber that is found only on what kind of animal?\nOptions:\n- (A) animals\n- (B) reptiles\n- (C) bird\n- (D) humans\n- (E) mammals\n- (F) insects\n- (G) goats\n- (H) Animal fur Let's solve this problem gradually.

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Hair is a fiber that is found only in mammals. All mammals have fur or hair. Fur is a fiber that is found only in mammals. So the final answer is (E).
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