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kenmyna
ATP  and  NADPH   molecules  produced  during the light   light  reaction  of  photosynthesis  are  needed  to  carry   out  the   dark  reaction.

  During  the  dark  stage  of   photosynthesis  ATP  and  NADPH  molecules  produced  during  the  light  stage  is  used  in the  dark  stage  to  fix  carbon  dioxide(CO2).  The   dark  stage  reaction  produces  sugar  molecules   and  other  organic  molecules  necessary   for cell function  and  metabolism
The molecules are ATP and NADPH. During the light reactions of Photosynthesis. Light is absorbed and the energy is used to drive electrons from water to generate NADPH and to drive protons across a membrane. These protons return through ATP synthase to make ATP. 
Dark reactions makes use of these organic energy molecules (ATP and NADPH) such that ATP provides the energy while NADPH provides the electrons to fix the carbon dioxide into carbohydrates.

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