How do scientists gather evidence during the potential outbreak of an infectious disease?

Many endangered species of birds in hawaii are in danger of contracting avian malaria from mosquito bites. many of these bird species live in the higher elevations of mountains in hawaii, where it is too cold for the mosquitoes to exist. if global warming continues at the current estimated pace, what would you expect to happen to the distribution of these bird species? a) their distribution will decrease to areas of even higher elevation. b) their distribution will increase because mosquitoes will die in the warmer regions. c) their distribution will remain the same, but their population size will decrease.