A500 g ball and a 200 g or dropped from a tower. those balls are the same size and there is no air resistance. which one hits the ground first? the 500 gthe 200g they both hit at the same time

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.