What is the most powerful factor that interacts with age to influence patterns of secondary aging?

Using the principles of operant conditioning, many inpatient psychiatric facilities use token __________ systems, so patients can earn a token for exhibiting desirable behavior, and later trade that token in for a desired privilege or treat

a. operant b. reinforcement c. economy d. reward

Research comparing Playboy playmates, Miss America pageant winners, and fashion models over the past 80 years found that their BMI _____________

a. increase significantly b. decreased significantly c. stayed the same d. decreased a little in the 1960s, then increased in the 1990s