Respiration reaction in humans is an example of _________.

• Displacement reaction: This is not applicable here. A displacement reaction involves one element replacing another in a compound, which is not what occurs in respiration.

• Endothermic reaction: An endothermic reaction absorbs energy from the surroundings. However, respirationreleases energyin the form of ATP, so it is not endothermic.

• Redox reaction: Respiration is indeed a redox reaction because glucose isoxidized(loses electrons) and oxygen isreduced(gains electrons). So, this option is valid from a chemical perspective, but the key focus in the question seems to be the type of energy transformation.

• Exothermic reaction: Respiration is primarily anexothermic reactionbecause itreleases energyin the form of ATP. In exothermic reactions, energy is released to the surroundings. Since respiration releases energy (ATP), this is a correct classification, and option D is the correct choice in the context of energy release.

This option is correct because respirationreleases energy, which classifies it as an exothermic reaction.