the human body

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Across
  1. 3. the thing that protects the heart and lungs from damage.
  2. 5. an organ in the respiratory system
  3. 6. the first part of the journey air goes through
Down
  1. 1. gas that you inhale
  2. 2. a type of gas that isn't affected from being inhaled and exhaled.
  3. 4. the organ that pumps blood around the body