Across
- 3. Produced by the immune system to neutralize pathogens
- 8. An organism that causes disease
- 9. Symptoms experienced when stopping drug use
- 12. Excess nutrients in water that causes algal blooms and oxygen depletion
- 14. substance that counteracts toxins
- 15. A type of drug that slows down the activity of the nervous system
- 16. The release of water vapor from plants into the atmosphere
- 17. The need for increasing amounts of a drug to achieve the same effect
Down
- 1. A type of drug that alters reality
- 2. The introduction of harmful substances into the environment
- 4. Taking more of a drug than the body can handle
- 5. Any substance that causes pollution
- 6. A type of drug that increases the activity of the nervous system
- 7. A drug that is derived from the unripe seed pods of a poppies
- 10. A foreign substance that triggers an immune response
- 11. The ability of an organism to resist disease
- 12. Water changes from liquid to vapor
- 13. Adding chlorine to water to kill harmful microorganisms