Lolan's Varied Difficulty Crossword

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Across
  1. 2. a trillionth of a kilometre
  2. 5. the first civilisation
  3. 9. a type of semitone
  4. 12. an animal that doesn't always have one thousand legs
  5. 19. the act of forming something
  6. 20. the chemical that makes plants green
  7. 21. flee from danger
  8. 24. opposite of primogeniture
  9. 27. milk sugar
  10. 28. work with other people
  11. 29. opposite of hyperglycemia
  12. 31. (of a place) empty
  13. 32. the process of changing something
  14. 33. the best of its kind
  15. 35. the era of the dinosaurs
  16. 37. a type of repition
  17. 38. a type of electromagnetic wave
Down
  1. 1. we do this on ANZAC Day
  2. 3. a place where people conduct experiments
  3. 4. a type of figurative language
  4. 6. a part of outer space that has no matter
  5. 7. a homograph
  6. 8. holiday
  7. 10. a thousandth of a litre
  8. 11. a billionth of a tonne
  9. 12. a structure of something to remind people of a person or an event
  10. 13. a coffin in ancient civilisations
  11. 14. what you are wearing
  12. 15. a bacteria killer
  13. 16. an unpleasant outcome
  14. 17. a published work that continues the story of a work that was published earlier
  15. 18. a country ruled by a few people
  16. 22. a millionth of a kilometre
  17. 23. anger
  18. 25. a detailed examinination of something
  19. 26. the state of being alone
  20. 27. white blood cells
  21. 30. after the antepenultimate
  22. 34. a trillionth of a quintillion
  23. 36. a mathematical instruction