respiratory system

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Across
  1. 3. Molecule released during gas exchange
  2. 5. The Respiratory system is made of lungs and the ____ tract
  3. 6. element taken in by the lungs during gas exchange
Down
  1. 1. Spongy organs used for breathing
  2. 2. system that shares organs with the respiratory system
  3. 4. tube containing vocal chords