Respiratory crossword

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Across
  1. 2. _______ is removed by the respiratory system
  2. 6. connects the lungs and the mouth
  3. 8. the process of the mouth taking in air
Down
  1. 1. take in air
  2. 3. the system which takes in oxygen and give out carbon dioxide for the body
  3. 4. lungs absorb ______ for the body
  4. 5. the mouth take in ___ from the mouth
  5. 7. absorbs oxygen for the body