During translation, the _ ribosomal subunit binds
to the mRNA, while the _
subunit binds to the tRNA
with attached amino acids.

Ibelieve the answer is relative humidity  because it makes more sense that way. solar flares usually occur in space it doesn't affect the earth, well it could but it wont make a significant damage.  latitude is land it doesnt do anything. prevailing winds, i dont know the correct meaning for this but i doubt that affects the land so it has to be relative humidity.

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The reactants are co_{2} aka carbon dioxide and h_{2}o aka water along with light energy