Symbiosis and the life cycle.
D000375:Aging; D001009:Anxiety, Castration; D004532:Ego; D005260:Female; D005619:Freudian Theory; D006801:Humans; D007989:Libido; D008149:Love; D008297:Male; D009769:Object Attachment; D010551:Personality; D011574:Psychoanalytic Theory; D011606:Psychosexual Development; D012043:Regression, Psychology; D012649:Self Concept; D012737:Sex Factors; D012725:Sexual Behavior; D012925:Social Conformity