Prehestoric insects sprawn new drugs

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Across
  1. 3. an effort made to accomplish something
  2. 8. to restore to life
  3. 9. being the earliest, original, first of a particular kind
  4. 11. Chemistry, Physics. the smallest physical unit of an element or compound, consisting of one or more like atoms
  5. 12. to express approval or admiration of
  6. 13. unable to be avoided, evaded, or escaped; certain; necessary
  7. 14. to found, institute, build
  8. 16. to develop gradually
  9. 17. never before known or experienced
  10. 19. to weaken or worsen
  11. 20. a fan, an enthusiast
  12. 24. to make clean
  13. 25. to occupy the attention or efforts of a person
  14. 26. to keep in existence or continuance; preserve; retain:
  15. 28. the act or power of resisting, opposing, or withstanding.
  16. 30. to get, pull, or draw out, usually with special effort, skill, or force
Down
  1. 1. to refuse to accept someone or something
  2. 2. to protected from a disease
  3. 4. to buy
  4. 5. a variant of a virus
  5. 6. to be like or similar to
  6. 7. to confirm
  7. 9. Physics-one of the extremely small constituents of matter
  8. 10. to convert into a fossil
  9. 15. to make impure or unsuitable by contact or mixture with something unclean, bad
  10. 18. to bury
  11. 21. to bring to a stop or stay
  12. 22. to be unlike
  13. 23. to acclaim; approve enthusiastically
  14. 27. Medicine/Medical- to designate remedies, treatment, etc
  15. 28. to vary within certain limits
  16. 29. to adjust oneself to different conditions, environment, etc