Which organ is responsible for the development of the embryo in female mammals?

The uterus is the organ responsible for the development of the embryo in female mammals. After fertilization occurs in the fallopian tube, the fertilized egg, now called a zygote, travels to the uterus. The uterus provides a supportive environment for the embryo to implant and grow. It is lined with a special tissue called the endometrium, which thickens to nourish the developing embryo and supports its growth throughout the stages of pregnancy.

The ovary plays a critical role in producing eggs and hormones but does not provide the environment for embryo development. The fallopian tube is the site where fertilization typically takes place, but it does not facilitate further development of the embryo. The cervix serves as a passage between the uterus and the vagina and plays a role during childbirth but is not involved in the development of the embryo itself. Thus, the uterus is uniquely suited for incubating the embryo, making it the correct answer.