The puzzle of the Integrated Science

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Across
  1. 2. word of chapter 15
  2. 4. word of chapter 10
  3. 7. word of chapter 1
  4. 8. word of chapter 5
  5. 11. word of chapter 17
  6. 13. word of chapter 4
  7. 18. word of chapter 7
  8. 19. word of chapter 23
  9. 20. word of chapter 19
  10. 23. word of chapter 31
  11. 24. word of chapter 24
  12. 25. word of chapter 29
  13. 26. word of chapter 20
  14. 27. word of chapter 3
  15. 28. word of chapter 12
Down
  1. 1. word of chapter 27
  2. 3. word of chapter 30
  3. 5. word of chapter 26
  4. 6. word of chapter 9
  5. 9. word of chapter 21
  6. 10. word of chapter 25
  7. 11. word of chapter 13
  8. 12. word of chapter 16
  9. 14. word of chapter 11
  10. 15. word of chapter 8
  11. 16. word of chapter 14
  12. 17. word of chapter 22
  13. 21. word of chapter 28
  14. 22. word of chapter 6
  15. 24. word of chapter 2
  16. 26. word of chapter 18