The distance from a to b is 20 cm, and the distance from a to c is 80 cm. What is the mechanical advantage of the system if effort is put on the longer arm? A. 0.25

B. 4

C. 40

D. 80

Ibelieve your answer is b.hope this : )

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.