In order to prevent injury in a car crash, it is recommended that you . Increase the time of the collision.
Increase the change in momentum of the collision.
Increase the force in the collision.
Increase the initial velocity of the collision.

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.