Fact 1: An animal usually requires a warm body temperature for survival. Fact 2: Warm blooded animals have a constant body temperature. Given the two facts above, animals usually require what for survival?

Choices:
(a). organic molecules
(b). organic material
(c). Fluctuating body temperature.
(d). Ears
(e). food and shelter
(f). Cold blood
(g). Organic compounds
(h). Constant body temperature.
The answer is:
(h).