Which term describes an animal whose body does not produce much internal heat?

• A. An animal whose body does not produce much internal heat
• B. An organism that is internally warmed by metabolism
• C. An animal that metabolizes heat
• D. A homeotherm

Answer: (A)

How animals regulate their body heat and the terms that describe that regulation.

An animal that does not produce much internal heat is an ectotherm. Ectotherms rely largely on external heat sources to warm their bodies, so their internal temperature tends to follow the environment rather than being kept constant by metabolism. The option that says an animal whose body does not produce much internal heat directly captures this idea, making it the best choice.

The other descriptions refer to different heat-regulation patterns: organisms warmed primarily by metabolism are endotherms, and the term homeotherm describes animals that maintain a relatively constant body temperature, often through metabolic heat production. The phrasing about metabolizing heat isn’t a standard term.