The Respiratory System

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Across
  1. 2. how oxygen flows throughout the body
  2. 4. the study of lung diseases
  3. 6. external body part that is used to inhale and exhale
  4. 7. A common lung disease which is caused by an infection of the lungs.
Down
  1. 1. the gas that exits the respiratory system
  2. 3. the type of gas that is the main intake for the respiratory system
  3. 5. the only organ that can float on water