Disposition and the environment.
D004777:Environment; D005190:Family; D005260:Female; D006803:Human Development; D006801:Humans; D007231:Infant, Newborn; D008137:Longitudinal Studies; D010551:Personality; D011574:Psychoanalytic Theory; D013694:Temperament; D014427:Twins / Q000523:psychology*; D014430:Twins, Monozygotic / Q000523:psychology*