Which organ is responsible for holding the developing fetus during pregnancy?

The organ responsible for holding the developing fetus during pregnancy is the uterus. This pear-shaped muscular organ is located in the female pelvis and has a crucial role during pregnancy. It provides a nurturing environment where the fertilized egg can implant and develop into a fetus. The uterine lining thickens to support the growing fetus, and the muscle contractions during labor help facilitate childbirth.

The other options serve different reproductive functions. The ovary produces eggs and hormones but does not hold the fetus. The fallopian tube is the pathway through which the egg travels from the ovary to the uterus, and fertilization typically occurs here. The cervix is the lower part of the uterus that opens into the vagina, playing a role in childbirth and protecting the uterus from infection, but it does not provide a space for fetal development. Thus, the uterus is distinctly recognized as the organ that houses the developing fetus during pregnancy.