Diffraction of white light with a single slit produces bright lines of different colors. Which wavelengths are more diffracted ?

Independent variable is something that is changed in a experiment. 

How many calories in food

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.