A 150-cm-tall diver is standing completely submerged on the bottom of a swimming pool full of water. From your point of view out of the water, on the edge of the pool, how tall does the diver appear to be?

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.