Finish the sentence Newton’s 3rd law states that for every force there is an
Forces always occur in
Whenever one object exerts a force on a second object, the second object always exerts a force back on the first object.
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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.