Question

A number of mosquito populations today are resistant to specific insecticides, even though those insecticides were highly effective when they were first introduced. biologists believe that insecticide resistance evolved in mosquitoes because

Answer 1

A few mosquitos probably were already resistant to the pesticide because of mutations and those mosquitoes that were resistant were the ones that survived .Thus the population of mosquitos that were resistant increased because that trait was the best trait that helped them adapt and survive.