Which of these statements about mixtures is true a. mixtures are made up of elements bonded together b. elements and compounds are types of mixtures c. pure substances are made up of mixtures combined in specific ratios d. mixtures are classified based on the distribution of particles in them

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.