Final answer:
Birth control pills work by taking advantage of the negative feedback system that regulates the ovarian and menstrual cycles. They prevent ovulation and prevent sperm from reaching the egg.
Step-by-step explanation:
Birth control pills work to provide contraception by taking advantage of the negative feedback system that regulates the ovarian and menstrual cycles. They contain both estrogen and progestin, which prevent the release of FSH and LH hormones and inhibit ovulation. They also cause changes in the uterine lining and cervical mucus to prevent sperm from reaching the egg.