Nature refers to the influence of heredity and genetics on the development of self as well as evolution, natural selection, survival of the fittest, and other aspects of Darwinism. Nurture refers to the impact that the social environment, socialization, and culture have on one's development. Supporters of the nature argument point to studies of identical twins separated at birth and compare their similarities. Certain traits appear to be clearly linked to genetics, including limits to certain physical and mental abilities. Supporters of the nurture aspect of the controversy also use studies of identical twins separated at birth to support their position. This includes studies that have revealed how identical twins grew up to choose very different
