The Respiratory System

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Across
  1. 3. breathing out
  2. 5. oxygen enters through here
  3. 6. this lung is smaller
  4. 9. what we breathe out
  5. 10. underneath the lungs
Down
  1. 1. breathing in
  2. 2. humans do this 20,000 times a day
  3. 4. can float on water
  4. 7. where air passes down
  5. 8. what we breathe in