Boogers are dried up bits of mucus. Mucus is a fluid created in the sinuses and nose that protects our bodies from dirt and dust that would otherwise harm our lungs.
Also, you have boogers because it is dead bacteria after a diesease/infection/sore/etc. It cleans out and it helps clean up your body.
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You get boogers by collecting mollecular bits of dust and dirt that build up in your nose, and there is also another type, you get it from dead bacteria after a diesease, so it literally is cleaning up your body.
From breathing in germs, dirt, pollen, etc. They trap the crap in the air so you're lungs are better protected.
boogers are the dirt that you breath in when the nose hair seperates the dirt and the air the dirt stays in your nose... then the dirt forms a booger.