Through which conversion is energy released?
a) adp to atp
b) atp to adp
c) nadp+ to nadph
d) co2 and h2o to c6h12o6 and o2

i think that d. wind is the answer.   i missed the question when i answered a. currents.

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.