Which of the following quantities are unknown?
initial separation of the particles final separation of the particles
initial speed of the proton initial speed of the alpha particle final speed of the proton
final speed of the alpha particle mass of the proton mass of the alpha particle
charge of the proton
charge of the alpha particle

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.

Idon't understand is there supposed to be a list or something if there is pm or add in under this message i will do my best to .