1. Presence of mammary glands: Fetal pigs have mammary glands, which are characteristic of mammals. These glands are responsible for producing milk to nourish offspring after birth.
2. Four-chambered heart: Like other mammals, the fetal pig possesses a four-chambered heart consisting of two atria and two ventricles.
3. Diaphragm: Fetal pigs have a diaphragm, a muscular membrane that separates the thoracic (chest) cavity from the abdominal cavity. The diaphragm plays a crucial role in breathing and facilitates lung movement.