Substance B is found to be more vicious than substance A, this means that
A. B flows faster at room temperature than A does
B. B flows slower at room temp. than A does
C. B has more mass per volume than A does
D. B has less mass per volume than A does

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.