What fiber can be found only in warm-blooded animals?
teeth birth marks muscle taste buds hair wool sugar fur
A B C D E F G H
All mammals are warm-blooded.
Hair is a fiber that is found only in warm-blooded animals.
What fiber can be found only in warm-blooded animals? (A) teeth (B) birth marks (C) muscle (D) taste buds (E) hair (F) wool (G) sugar (H) fur