What the difference between cellular respiration and combustion

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which product of cellular respiration enables humans to perform life activities

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Cellular respiration is the set of the metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.
Combustion or burning is the sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat and conversion of chemical species.

ATP enables humans to perform life activities.

ATP.