The bonds connecting atoms in molecules contain energy. Chemical reactions involve the breaking of bonds in the input (reactant) molecules and the formation of bonds in the output (product) molecules. Energy is used in order to break bonds during reactions. Energy is released as bonds are formed during reactions. Energy can be measured using the unit kilocalories (kcal). The energy required to break apart glucose and oxygen during cellular respiration is 2,878 kcal. The energy released during the formation of carbon dioxide and water during cellular respiration is 3,564 kcal.

Identify whether cellular respiration requires a net input of energy or if the reaction results in a net release of energy. Use mathematical evidence to support your response.