Euthenics: It is the study of improvement of human races by providing better conditions. Euthenics means human improvement by altering external factors like as education or the controllable environment, containing the prevention or removal of contagious disease & parasites, environmentalism, education regarding with sanitation, home economics or housing.
Euthenics is different from eugenics primarily in which that eugenics concerned is the improvement of the human species through the manipulation of genetic inheritance by using various techniques of selective breeding while euthenics is concerned with uninheritable improvements in human beings at a particular time or place. The result of the euthenics approach is have long-term genetic effects, but we can achieve them very differently from eugenics.