Okay, explain how a nose came about to exist in your face and to operate for you to live healthily, with chance, or probability, or chaos...
The nose is important, and it serves various functions. For example, nasal shape and size correlates with temperature and humidity. In hot and moist areas the nose can be smaller and wider (and I am talking primarily about the skeletal structure) while in cold dry areas the nose needs to be larger and narrower as it warms and humidifies air before it reaches the lungs.
The rest of the story is mutations and natural selection, same as always.
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