A dominant allele is . a trait that is hidden by another trait
a trait that prevents the showing of other traits
a trait that has been altered by a DNA mutation
a trait that will not be seen in the next generation of offspring

A dominant allele is a trait that prevents the showing of other traits

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.