A<unk>  is a protuberance in vertebrates that houses the nostrils, or nares, which receive and expel air for respiration alongside the mouth. Behind the<unk>  are the olfactory mucosa and the sinuses. Behind the nasal cavity, air next passes through the pharynx, shared with the digestive system, and then into the rest of the respiratory system. In humans, the<unk>  is located centrally on the face and serves as an alternative respiratory passage especially during suckling for infants. The protruding<unk>  that completely separate from the mouth part is a characteristic found only in therian mammals. It has been theorized that this unique mammalian<unk>  evolved from the anterior part of the upper jaw of the reptilian-like ancestors (synapsids).
Nose
Caul
Hearing
Eyewear
Sense of smell
Caren
Crown 
Nail 