Which of the following is a characteristic of the birth control pill?

The birth control pill is primarily designed to prevent ovulation, which is the release of an egg from the ovaries. By delivering hormones such as estrogen and progestin, the pill effectively regulates the menstrual cycle and ensures that ovulation does not occur in most cycles. This mechanism is essential for preventing pregnancy, as the absence of ovulation means there is no egg available for sperm to fertilize.

While effectiveness and access can vary, it is important to note that no contraceptive method, including the pill, is 100% effective. The pill does require a prescription in many places, and it is taken orally rather than through injections. Thus, the characteristic that it prevents ovum formation highlights the primary function and purpose of the birth control pill effectively.