What can generate little bursts of heat by shivering?
alpacas bacteria animals polar bears phytoplankton rabbit viruses humans
A B C D E F G H
Polar bears are mammals.
polar bears can generate little bursts of heat by shivering
What can generate little bursts of heat by shivering? (A) alpacas (B) bacteria (C) animals (D) polar bears (E) phytoplankton (F) rabbit (G) viruses (H) humans