Across
- 4. tiny one -celled onganisms that live nearly everywhere
- 5. , fragile , elastic , microscopic air sacs
- 6. a thick , dark liquid that forms when tobacco burns
- 8. a disease that destroy alveoli
- 9. a drug that relieves pain and dulls the sense
Down
- 1. system the organs that supply your body
- 2. monoxide a colorless , odorless , poisonous gas
- 3. Large , done - shaped muscle below vessels nerve endings
- 7. the tube in the throat that takes air