What is it meant by variation in living things 1.Different species have different attributes
2.Different individuals within a species have variation because they may express different alleles for the same traits
3.All the possible trait variations of a single population
4.The number of organisms a given area will support

Bis the correct answer.

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.

Soil? it sounds right when you r3ad it in a sentence