Respiratory system

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Across
  1. 3. Main branches of the trachea
  2. 4. Cavities divided into two seperate cavities
  3. 7. Voice box
Down
  1. 1. connecting of nostrils and mouth
  2. 2. Paired and found in thorax
  3. 5. Principle site of gaseous diffusion
  4. 6. Passageway to lungs
  5. 8. also called nares