Respiratory system

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Across
  1. 2. The air goes through this body part when we breath in
  2. 4. We need this gas to live
  3. 6. The air goes down this tube before reaching the lungs
Down
  1. 1. We release this gas when we breath out
  2. 3. They transfer the oxygen to the circulatory system
  3. 5. The air goes through this body part when we breath in