Which of the following is not a reason why stis spread so quickly?
a.
many people with stis are asymptomatic.
b.
negative stigmas prevent people from seeking .
c.
protection used during sex usually fails.
d.
many people have a false sense of invulnerability.

By 2 weeks after fertilization the morula has implanted into the uterine lining and transforms into a(n) . this time is when the , or the organ that will provide nourishment to the fetus by exchanging nutrients and waste products, begins to develop.

Muscles and joints that can move through their full range of motion are more powerful, more coordinated, and less likely to be injured.

Which is the best method of avoiding peer pressure to enage in inappropriate sexual activity? a. quietly say no and explain why it goes against your values. b. break up with your partner if he or she suggets having sex. c. inform your partner of your limits and values from the start.