What percentage of American female adolescents have engaged in sexual conduct by the age of 18?
a. 25 percent c. 50 percent
b. 37 percent d. 70 percent
Question 2
How many days after learning a task can a typical 3-month-old remember it?
a. 12 hours c. 3-4 days
b. 1-2 days d. up to one week