Which of Earth's layers is represented by the number one (1) on the image above? A.
the inner core
B.
the outer core
C.
the mantle
D.
the crust

Which of these contraceptive methods on its own is least likely to prevent pregnancy ? a. spermicides b. condoms c. surgical sterilization d. oral contraceptives

Which term defines one age as measured in years

Which of the following is a lifestyle behavior? a. getting enough sleep b. exercise c. tobacco use d. all of the above