A wind blowing at 25.0° exerts a force of 675 N on the sail of a boat which in turn is propelled 1.55 km, 45.0°. (Consider directions as viewed from overhead.) Find the work done by the wind.

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.