Flooding wildfire landslide and climate change are 4 factors that would lead to

I feel like it is emigration, due to the fact that mutations are random, immigration means coming in and death not really cuz climate change, flood, and landslide will not actually mean full death. In the end i feel like it is emigration but you argue about being death too. 

North carolina ranks second in christmas tree production has nothing to do with biotechnology

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.