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Text File  |  1992-09-02  |  196b  |  7 lines
  1. The mouth is the cavity forming the entrance 
  2. to the digestive tract. In land vertebrates, 
  3. air from the nostrils enters the mouth cavity 
  4. to pass down the trachea.  
  5.  
  6. Subject by: Andrew Longhorn
  7.