Which structure houses the developing fetus during pregnancy?

The uterus is the correct structure that houses the developing fetus during pregnancy. This organ is specifically designed to provide a supportive environment for a fetus to grow and develop. The uterus has a thick, muscular wall that can expand to accommodate the growing fetus, as well as a rich blood supply that nourishes the developing embryo. Additionally, its inner lining, known as the endometrium, thickens to facilitate implantation when the fertilized egg attaches. Throughout pregnancy, the uterus protects the fetus and plays a crucial role in the delivery process by contracting during labor to help push the baby out.

In contrast, the cervix is the lower part of the uterus that opens into the vagina; while it plays a role in pregnancy and childbirth, it does not house the fetus. The ovaries are responsible for producing eggs and hormones, but they do not serve a function in housing the fetus. The bladder is an organ that stores urine; it does not have any role in fetal development or support during pregnancy.