Part c - preventing pregnancy some methods of contraception, such as birth control pills and patches, use synthetic hormones to manipulate the ovarian cycle in females. some hormone-based contraceptives contain a combination of a synthetic estradiol and a synthetic progestin (progesterone-like hormone). other hormone-based contraceptives contain progestin only. which statements correctly explain how the hormone-based contraceptives affect the female reproductive cycle? select all that apply.