What is the term for body weight that is more than 20 percent higher than the average weight for a person of a given age and height?

Eric wants to decrease his chance of developing AIDS. Which of the following would be good advice for him?

a. Limit the number of sexual partners he has. b. Use condoms to control the exchange of semen. c. Avoid anal sex with males or females. d. All of these.

For most people, there is a similarity in background, age, interests, attitudes, and beliefs with

a. the casual acquaintances they talk to at work. b. their friends. c. the individuals they marry. d. all of these individuals.