On which of these hills does the ball roll down with increasing speed and decreasing acceleration along the path? (Use this example if you wish to explain
to someone the difference between speed and acceleration.)

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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.

The relationship of both of them