People who perform well at work, do well in school, rarely have automobile accidents, are healthier, and even live longer tend to be high on the dimension of the five-factor model known as

In humans, the olfactory system:

a. is not very sensitive. b. is more sensitive if individuals get closer to the source of the smell. c. allows individuals to detect 500 different odors. d. allows individuals to detect 20 different odors.

David, a 13-year-old boy, often feels a tightness in his chest that makes it very difficult for him to breathe. This also stops him from participating in sports activities like running and swimming. David is most likely suffering from _____.

A. asthma B. autism C. attention-deficit/hyperactivity disorder D. dyslexia