passivation is the answers
4. drug use will lower academic achievement of high shool
Answer:
C
Explanation:
By itself, spermicide prevents just 72% of pregnancies, the least effective of any major contraceptive measure. Because of its poor success rate, spermicide is often used in conjunction with other contraceptives such as patches and condoms.
It's the outer membrane / cell membrane. Cells transport into and out of the Membrane
