Respuesta :

a cavity within a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities.
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Answer:

An air-filled cavity in a dense portion of a skull bone. The sinuses decrease the weight of the skull. The sinuses are formed in four right-left pairs. The frontal sinuses are positioned behind the forehead, while the maxillary sinuses are behind the cheeks.

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