Across
- 2. blood cells that fight infection
- 3. a tiny living things is called a..
- 7. the scientific name for the windpipe
- 8. the gas produced when plants make their own food
- 9. sugar needed for respiration
- 10. blood vessel that carries blood away from heart
- 12. wall of the heart
- 14. the air sacs where gas exchange takes place
- 15. cannot be killed with antibiotics
- 16. these bones protect the heart and lungs
Down
- 1. the green chemical in leaves
- 4. clot the blood
- 5. plants use this gas to make their own food
- 6. the way plants make their own food
- 11. process used by cells to make energy
- 13. ecoli is an infection caused by....