Which best contrasts sublimation and vaporization? Sublimation involves a change from a solid, and vaporization involves a change from a liquid. Sublimation results in a gas, and vaporization results in a liquid. Sublimation involves the absorption of heat, and vaporization involves the release of heat. Sublimation involves the release of heat, and vaporization involves the absorption of heat.

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The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.