Aload of 600n is raised by an effort of 2000
by using i meter long crowbar. if the lod is
20cm away from the fulcrum, what is the
efficiency of the crow-bar?

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.