Across
- 1. an illness caused by bacteria and can be spread through the air
- 3. a place in the lungs where the gas exchange occurs
- 5. breathing organ in fish
- 6. a product of sugar + oxygen reaction
- 7. the hair to remove dust from the air we breathe in
- 9. breathing organ in fish
- 10. a place where the air enter the body
Down
- 2. breathing hole in insects
- 4. a process of breaking down sugar and helped by the oxygen to make energy
- 8. a process in breathing where the lungs expands & increase in size