William McDougall's original research on instinctual motivation proposed a total of __________ instincts for humans, whereas later researchers believed there were __________

Your 20-year-old brother is 5'10" tall. He claims that he is going to grow another two inches. Is this likely?

a. Yes, most people grow taller until bone growth completion around age 24. b. Yes, most people grow taller until bone growth completion around age 21. c. No, most people are their full adult height by 18 years of age. d. No, most people reach their full adult height by 14 years of age.

People join groups and seek out group affiliation for a number of reasons. Which of the following is not a reason people seek to join groups?

A) Social comparison B) When conditions are threatening or uncertain C) Psychological security D) Independence E) Emotional connection