posted by Jason .
Organisms that maintain a constant body temperature rely on the heat produced by cells. Where does this heat come from?
A) Special metabolic pathways exist just for the production of heat.
B) Mitochondria produce heat in the form of ATP.
C) Plants store up heat as they perform photosynthesis. When an organism digests a plant, that heat is released.
D) Heat is a natural by-product of most chemical reactions.
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