Across
- 2. .......can breathe through their skin
- 7. muscular sheet moves up and down while breathing
- 8. main organ of respiratory system in fishes
- 9. air exhaled has more.....
Down
- 1. we should not breathe from our ........
- 3. layer of tiny......in the nose protects the dust from entering our nose
- 4. scientific name of windpipe
- 5. main organ of respiratory system in humans
- 6. air inhaled has more......