Which is the least expensive method of contraception over time?
a. spermicides and barrier methods c. progestin-only hormone methods
b. combined hormone methods d. intrauterine methods
Question 2
At least one study has found that brain fingerprinting is ____________ accurate in distinguishing liars from truth-tellers under optimal laboratory conditions.
A. 15-25
B. 65-75
C. 35-45
D. 85-95