Which organ is designed to hold and nourish the fetus until the end of a pregnancy?

The uterus

Explanation:

The uterus is the female reproductive organ in which the gestation of human beings and other mammals occurs. It is a hollow, triangular shaped muscular organ, located in the pelvic cavity, in front of the rectum and behind the urinary bladder. Its length is about eight centimeters and its width of five centimeters. It has an ovary on each of its sides, an organ in which hormones and ovums are produced, the female sex cells, which reach the uterus through the fallopian tubes. The uterus is the organ in charge of pregnancy. The ovaries produce the ovules, which travel through the fallopian tubes. Once the ovum leaves the ovary it can be fertilized and implanted in the wall of the uterus. Its main function is to hold the fertilized ovum and offer the optimal conditions for the embryo to develop inside.