Identify the pregnancy prevention method(s) that prevent the release of an egg, thickens the cervical mucus and reduces the buildup of the endometrial lining within the uterus. (mark all that apply) a. vaginal ring b. diaphragm c. oral contraceptives d. tubal ligation

The vaginal ring is a soft, plastic ring that releases a continuous dose of the hormones oestrogen and progestogen into the bloodstream and prevents pregnancy. Oral contraceptives are also drugs for preventing pregnacy and also contain combinations of the hormones estrogen and progestin )or progestin alone=. Estrogen and progestin inhibit the release of the hormones luteinizing hormone (LH) and follicle stimulating hormone (FSH) which have a role in the ovulation.

the answer is "a.) well–developed vascular system."

explanation:

a- all cells come from pre-existing cells