They are a first-line immune system organ. Things come in the mouth and the immune system gets a look at them in the tonsils. It helps with being ready for infection and disease, but is not essential. It’s a nice thing to have, but not essential. Sort of like a sense of smell or taste are nice to have but not essential.
Meanwhile, if you lose both kidneys, you have no way to process waste in the blood, and die.
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