In electrostatic systems, a potential difference (i. e, a voltage) always corresponds to an electric field. is this also true about circuits? specifically, does the potential difference between the two terminals of the battery correspond to an electric field anywhere? or do circuits allow us to have "voltages without fields? "

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.

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