The digestive system , Rectum , Teeth, Stomach, Small intestine, Largue intestine, The respiratory system, Diaphragm, Carbon dioxide, Lungs, trachea, Nostrils, The circulatory system, Heart, Blood, Arteries, Veins, The excretory system, Kidneys, Urine, Ureters, Bladder, Urethra, The locomotor system, Bones, Muscles, Joints.

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