What is the function of the uterus in female rabbits?

The uterus in female rabbits plays a crucial role in reproduction, specifically by providing a safe and nurturing environment for developing kits (baby rabbits) before birth. During gestation, the uterus supports the growth of the embryos, supplying them with nutrients and oxygen through the mother's bloodstream via the placenta. This protection and nourishment are essential for the proper development of the kits, ensuring they are healthy and viable when born.

The other functions mentioned in the options pertain to different systems within the rabbit's biology. For instance, digestion and water storage are unrelated to the reproductive system, and breathing is associated with the respiratory system. Thus, the primary and distinct function of the uterus is to nourish and support the developing kits prior to their birth.