In which organ does a baby develop during gestation?

The correct answer is the uterus, which is the primary organ in which a baby develops during gestation. The uterus, often referred to as the womb, provides a protective and nurturing environment where the fertilized egg implants and grows into a fetus. It has the necessary blood supply, tissue, and structures to support the developing baby throughout the nine months of pregnancy.

The other options are not suitable for fetal development. The ovary is responsible for producing eggs and hormones but is not involved in housing a developing fetus. The fallopian tubes are the pathways through which the egg travels from the ovary to the uterus and are also where fertilization typically occurs; however, they are not capable of supporting fetal development. The cervix serves as a passage connecting the uterus to the vagina and plays a role during childbirth, but it does not provide an environment for gestation. Thus, the uterus is specifically designed for development during gestation, making it the correct choice.