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Respiration is a pure exothermic reaction because when we exhale there us carbon dioxide along with the residual oxygen and with certain amount of water vapour. No heat energy is provided during inhalation however the energy or heat liberated during oxidation of the food and other activities comes out as heat energy. Since there is heat energy released during respiration the reaction is called to be the exothermic reaction.
in all exothermic reactions the reactants will have higher energy than the products. the answer is pretty much the same as why freezing is an exothermic reaction-- because the release of energy is occurring as bonds are forming. to form bonds, energy must be inputted or it won't happen naturally.