DNA is the genetic material that makes up living things and folic acid plays an important role in the formation of dna Jon wants to study the effect of folic acid on dna formation in microbes which statement accurately describe he variables in this study?

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.