Respiratory system

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Across
  1. 3. something that filters the air
  2. 5. something that carries the blood through your body
  3. 8. dioxide what you breathe out
  4. 9. also known as the windpipe
Down
  1. 1. Something that holds you air after you breathe in
  2. 2. the system that I'm doing
  3. 4. about how many times you breathe a day
  4. 6. how you get air in you
  5. 7. what you breathe in