It’s a no-brainer that you need your brain and your heart, and you wouldn’t last long if you’re failed. But the lungs and kidneys come in pairs, so you could survive if one of them failed. People who’ve lost their spleens in accidents have gone on to live healthy lives. The tonsils and appendix, meanwhile, are practically useless and are routinely removed when they become inflamed. People may have their colon removed as a way to treat colon cancer or Crohn’s disease, or in some cases, to prevent colon cancer. People can live without a colon, but may need to wear a bag outside their body to collect stool.
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