Natural selection + organisms

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