Determine the absolute pressure (in Pa) in the tank if the height of the mercury in the open tube is 17.5 cm higher than the mercury in the tube connected to the tank.

The answer is d) by requesting advice on science internet sites

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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.