Final answer:
Desogestrel/ethinyl estradiol is used in birth control pills because it mimics the release of estrogens and progestins during pregnancy to prevent ovulation.
Step-by-step explanation:
Desogestrel/ethinyl estradiol is a combination used in birth control pills. The release of synthetic estrogens like ethinyl estradiol and progestins prevents ovulation, thus preventing pregnancy. Other risks of using synthetic hormones for birth control include weight gain and a greater chance of forming blood clots.