What percentage of emerging adults in the United States, Canada, and in Northern European countries cohabit before marriage?

The symptoms of conversion disorder often resemble

a. flu-like symptoms. b. neurological diseases. c. gastrointestinal problems. d. dissociative identity disorder.

Puberty is defined as the age at which a person:

a. enters middle school or junior high. b. begins to be treated as an adult by others. c. experiences his or her first growth spurt. d. becomes capable of sexual reproduction.