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17 / 120  The paranasal sinuses are ________.
A  air-filled spaces found within the frontal, maxilla, sphenoid, and ethmoid bones only
B  air-filled spaces found within all bones of the skull
C  not connected to the nasal cavity
D  divided at the midline by the nasal septum

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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