The Austin Blind Salamander cannot see because of the adaptation to environment .In deep spring light is not required so there is no need of eye,so eye remain vestigial to them . Genetic drift and direct and indirect selection occurred during loss of eye for adaptation in dark .Transposons and mutation for better could have made possible such changes. During evolution mutation through transposon led to several changes according to the adaptation to the environment. Solution The Austin Blind Salamander cannot see because of the adaptation to environment .In deep spring light is not required so there is no need of eye,so eye remain vestigial to them . Genetic drift and direct and indirect selection occurred during loss of eye for adaptation in dark .Transposons and mutation for better could have made possible such changes. During evolution mutation through transposon led to several changes according to the adaptation to the environment..