On a break from class you decide to ride up and down all of the elevators on the upper campus. you approximate your mass to be 70 kg because that is the mass of a person we used in class last week. you guess that the elevator in the aliso lab building is going up at a speed of 10 m/s. the elevator takes 4.0 s to brake at the second floor. what is your weight before the elevator started braking

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.

True will be your answer dude