Cellular respiration is a biological process in which glucose is broken down to form energy in the form of ATP. The reactants have a starting energy of 3564 kilojoules of energy, and the products have a resulting 2878 kilojoules of energy.Which best describes cellular respiration?

The products contain 2,878 kJ, which is less energy than the reactants’ 3,564 kJ. The difference, 3,564 − 2,878 = 686 kJ, is released to the surroundings. A reaction that releases energy is exothermic, so the correct choice is “It is an exothermic reaction because energy is lost.”

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