What fiber can be found only in warm-blooded animals?\nOptions:\n- (A) teeth\n- (B) birth marks\n- (C) muscle\n- (D) taste buds\n- (E) hair\n- (F) wool\n- (G) sugar\n- (H) fur
Let's think step by step.
(E)
Hair is a fiber that is found only in mammals.

All mammals are warm-blooded.

Hair is a fiber that is found only in warm-blooded animals.

.

Therefore, the answer is (E)