Respuesta :
The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions take place in the thylakoid membranes of organelles called chloroplasts.
Answer:
Solar energy
Explanation:
Because although there are MANY factors that play into this process, the one that it cannot do without at all, whatsoever, is Solar Energy.