We do use appendix and tonsils, you just do not realise it.
Tonsils function is to trap germs, the appendix function is still unknown but I bet it does something useful (like storing “good” bateria)
Nothing in biology happens without a reason. Every part of your body evolved for a specific purpose once upon a time. Some things we can live without (like appendix and tonsils) but they still perform a function!
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