the acidic levels of pH inside the vagina is one of the top reasons why sperm die.
Which of the following statements is true?
Certain sexual behaviors are risky and can result in negative consequences.
"Vaccination works to stimulate a specific immune response that will create memory B and T cells specific to a certain pathogen. These memory cells persist in the body and can lead to a quick and effective response should the body encounter the pathogen again."
its the same idea...
