Which of the following statements best describes the relationship between the light-dependent and light-independent reactions of photosynthesis?
1) the light-independent reactions release energy, and the light-dependent reactions require energy.2)the light-dependent reactions produce atp and nadph, which are then used by the light-independent reactions.3)the light-dependent reactions produce carbon dioxide, which is then used by the light-independent reactions.4)the light-dependent reactions pass electrons through an electron transport chain to the light-independent reactions.