RESPIRATORY SYSTEM

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Across
  1. 3. A colorless, odorless gas that we need to breathe.
  2. 5. the tube were the oxygen travels
  3. 6. Tubes at the end of the trachea
  4. 7. The "airbags" that we fill with oxygen
Down
  1. 1. the holes in our nose
  2. 2. taking air into your lungs
  3. 4. releasing air from your lungs