A small child has a wagon with a mass of 10 kilograms. The child pulls on the wagon with a force of 20 N to the right. What is the acceleration of the wagon? (Assume no friction).

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.