We normally have 2 kidneys, which act as filters to remove impurities in the blood. Some people are born with one kidney. Others have a kidney surgically removed,. It is possible to live a normal life with just one kidney. It is also possible to live with no kidneys. You can do this by having regular kidney dialysis which uses a machine to remove waste from your blood.
You can live without a liver, for a very short period of time. If you are going to donate your liver to someone, they will only take part of your liver and give it to that person. The greatest thing about livers is that they will grow back. They will grow to their normal size over time.
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