Across
- 4. normal functioning
- 10. medication
- 12. germs
- 13. dependence habituation
- 14. blood protein
- 15. body chemistry
- 17. complex molecules
- 18. abuse illegal
Down
- 1. infection
- 2. liquid
- 3. independence
- 5. protect
- 6. tissue
- 7. substances
- 8. molecules
- 9. drug abuser
- 11. fatty acids
- 16. system cells