Which structure serves both a reproductive and an exit function for the fetus?

The vagina serves both a reproductive and an exit function for the fetus. As a reproductive structure, the vagina is part of the birth canal that allows for the passage of a baby during delivery. It connects the external genitalia to the uterus and plays a crucial role in childbirth by providing the necessary channel for the fetus to exit the mother's body.

In addition to its role in childbirth, the vagina is also important in sexual reproduction. It serves as the receptacle for the male's penis during intercourse and is where sperm enters in order to fertilize an ovum, initiating the reproductive process. This dual function distinguishes the vagina from other structures such as the cervix, ovary, and uterus, which do not provide the same combined roles during delivery and reproduction.