In the 1980s, political scientist James Flynn observed that the IQs of Americans were rising at a rate of about _____ point(s) per decade

The illusion based on the concept that most people live in a world with lots of buildings and corners is the _________

a) moon illusion b) Poggendorf illusion c) Ponzo illusion d) Müller-Lyer illusion

Research into the concept of self-esteem has found that it is

a) a constantly-changing, dynamic concept. b) stable in childhood and adulthood, but not during adolescence. c) nonexistent in childhood, unstable in adolescence, and stable in adulthood. d) relatively stable from childhood through adulthood.