Across
- 4. that starts behind the nose ends at the
- 5. gland secretes
- 8. of life-sustaining chemical reactions in organisms
- 9. of the end products of anaerobic respiration
- 10. for providing energy for photosynthesis
- 14. the lungs and the blood exchange
- 15. of alveoli
- 16. process in amoeba
- 17. of holozoic nutrition
Down
- 1. of nutrition which bacteria have
- 2. secretes
- 3. below the lungs
- 6. tiny branch of air tubes in the lungs
- 7. of extracellular digestion
- 11. and carbon dioxide
- 12. is protected by
- 13. of the trachea