You are presented with the quiz "What can mammals generate heat with?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "mammals can also generate little bursts of heat by shivering" and "heat is produced by muscle action and shivering". So, what's the best answer to the question?
Select from the following.
A). Muscle action.
B). with their fur.
C). fur and fat.
D). layers of fat.
E). hair.
F). Animal fur.
G). waistlines.
H). Bone action.
A).