Natural selection + organisms

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Across
  1. 2. name of a person who consumes a lot of alcohol
  2. 6. synonym of breathing
  3. 10. this drug is contained in the alcohol
  4. 12. synonym of fossil
  5. 13. a person who breathes in the smoke but doesn't smoke by himself
  6. 15. a sticky black material that collects in the lungs
  7. 16. this noun means that you feel really worried
  8. 17. this noun means that you cannot stop consuming something
  9. 18. when a woman is expecting a baby
Down
  1. 1. system of blood movement in the body
  2. 3. this body organ suffers a lot from alcohol
  3. 4. a noun that means that species change something in their organism to become better prepared for the environment
  4. 5. antonym of dark color
  5. 7. opposite of legal
  6. 8. a noun that means production of new babies within the centuries
  7. 9. type of drugs that helps you to relax
  8. 11. opposite of harmless
  9. 14. when your body produces a lot of water on its surface