Fact 1: An animal requires warmth for survival.

Fact 2: Heat is produced to maintain warmth in the boy.

Given the two facts above, answer the question "an animal requires what by the body for survival" with the following options: 
- stamina
 - heat energy
 - energy adaptors
 - heat produced
 - glycogen
 - chemical messengers
 - heat eaters
 - cool breeze


 

    heat produced     