The correct answer for the question that is being presented above is this one: "6H2O, NADP, light energy, 18ADP + Pi." The input of the light-dependent reactions, labeled X is that <span>6H2O, NADP, light energy, 18ADP + Pi.</span>
The three parts of ATP are the adenine base, ribose and the phosphate groups.
It is a perfect example of a natural selection.
(I'm not sure if this is the exact answer that you are looking for.)
