Respiratory System - Puzzle

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Across
  1. 2. breathe in
  2. 4. breathe out
  3. 6. a pair of spongy, air-filled organs located on either side of the chest
  4. 7. comapartment in the lungs containing air
Down
  1. 1. main part of respiration
  2. 3. process of breathing
  3. 5. tissue in human body