The development of melanin pigment in moth occurred due to mutation. Industrial melanism is an adaptation where the moths living in the industrial areas developed melanin pigments to match their body to the soot-covered surroundings. Of these, peppered moth (Biston betularia) is the most intensively studied one. DDT was used as an effective insecticide to control mosquito. But, within two to three years new DDT resistant mosquito appeared in the population and soon they replaced DDT sensitive mosquitoes Thus industrial melanism and DDT resistant mosquitos supports evolution by natural selection.