Internal organs include brain, lungs, heart, liver, kidneys, pancrease, stomach, intestines, circulatory system, muscles, connective tissue, bones, spinal cord, lymph system and nervous system. you must also have some kind of airway to bring oxygen into the body. You could live for a time without your stomach or intestines but eventually you would still die because the body can not maintain on artificial nutrients forever. You can also live with one kidney and one lung.
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