One criticism of the minnesota study on the genetic influence of intelligence was

I found a list of criticisms of the Minnesota study on the genetic influence of intelligence.

The list stated:
1) Bouchard relied on media coverage to recruit participants
2) Ethical concerns about the way Bouchard reunited the twins.
3) No adequate control to establish the frequency of contact between the twins prior to the study
4) Assumption that the twins who are raised together experience the same environment = "equal environment assumption" is not accurate. 

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.