How does a diaphragm prevent pregnancy?
a.
it releases spermicide into the uterus to keep sperm from fertilizing eggs.
b.
it produces hormones that keep a woman's ovaries from releasing eggs.
c.
it covers the penis to keep it from releasing sperm into the vagina.
d.
it blocks the cervix in order to keep sperm from entering the uterus.

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there

diseases can be cured more rapidly as medical advancements spread from region to region. -apexxx