The spectra for elements are

a. all the same
b. the same for a chemical family
c. the same for elements with similar mass
d. all different and specific to each

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.

Because they're in different places for this the temperature varies.