On a graph with the title weight of a player versus speed of a player speed of a player is thevariable.
a. experimental b. dependent c. controlled d. independent

I think the answer is letter A

Are there options for 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.