5. what is the nature vs. nurture principles? 6. know the difference between what is nature vs. nurture? 7. what does socioeconomic status refer to? 8. what is plasticity? 9. what is a norm? 10. what is a developmental theory? 11. what is operant conditioning? 12. who originated psychoanalytic theory? 13. what are the stages of psychosexual theory? 14. who is erikson and what did his theory to explain? 15 rehaviorism has alsn heen referred to as what thenrv?