Lucy had both her left ovary and her right uterine tube removed surgically at age 17 because of a cyst and a tumor in those organs. Now, at 32, she remains healthy and is expecting her second child. How could Lucy conceive a child with just one ovary and one uterine tube, widely separated on opposite sides of the pelvis like this? (Note: She did not have artificial insemination or in vitro fertilization.)