Respiratory System

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Across
  1. 4. harmful gas to humans
  2. 6. largest organ in the respiratory system
  3. 7. Bronchial allergy to proteins
Down
  1. 1. infection of the lungs
  2. 2. 2 airways to the lungs
  3. 3. action of releasing air from the respiratory system
  4. 5. windpipe after the pharynx