THE RESPIRATORY SYSTEM

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Across
  1. 1. the passage that air takes into and out of the body
  2. 3. the gas that forms as our body uses oxygen, poisonous, CO2
  3. 6. breathing tube located in the neck
Down
  1. 1. tiny air sacks that branch out, allowing for gas exchange
  2. 2. the site of gas exchange
  3. 4. how air enters and exits our body
  4. 5. the gas that provides our body with energy, O2