We have to brush our teeth twice a day or they rot, shower or we smell like shit, wash our face or we get blackheads etc.
In: Biology
Animals have these needs too. This is why many of them die younger than they have the potential to live. Domestic animals tend to live longer when kept clean and healthy by human technology for this reason.
Before people had discovered the necessity of hygiene was when lifespans were around 30 years old.
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