Where does the energy come from to make nadph in the light reactions?

From the energy stored in light

Explanation:

Apex

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

substitution is the answer in this case