How many emerging adults in the United States, Canada, northern Europe, England, and Australia cohabit during emerging adulthood?

Who is engaging in distributed practice?

A) Geoff, who has been studying an hour a night over the last three weeks for his anatomy final B) Angela, who just read through her notes on the way to take her algebra final C) Kris, who made flash cards last night for his psychology final today D) Alan, who pulled an "all-nighter" to get ready for his biology final

According to the Durex Global Sex Survey, who is most sexually active?

a) teenagers b) people in their early twenties c) 18 year olds d) thirty to forty-four year olds