4W - HSB

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