Many human characteristics, such as height, are distributed so the majority of scores fall in the middle of the distribution, with fewer extreme scores. What do we call this type of distribution?

According to research on older adults

A. reaction time improves with age B. movement time declines with age C. response time improves with age D. no differences exist in movement time between young adulthood and older adulthood

Research on the genetic predisposition toward schizophrenia has indicated that ________

a. the risk of schizophrenia for the unaffected twin, when an identical twin has schizophrenia, is greatly reduced if the twins have been reared apart. b. among identical twins, when one twin develops schizophrenia the other twin has an 80 percent chance of developing schizophrenia. c. children with two schizophrenic parents have a 27 to 46 percent lifetime risk of developing schizophrenia, compared to a risk in the general population of about 1 percent. d. children with one schizophrenic parent have about the same risk of developing schizophrenia as do people in the general population.