How do oysters produce pearls?

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  1. #intruder
  2. #grain
  3. #floating
  4. #begins
  5. #called
  6. #oyster
  7. #slips
  8. #layer
  9. #covers
  10. #mantle
  11. #natural
  12. #shells
  13. #pearls
  14. #protective
  15. #shell
  16. #cultured
  17. #pearl
  18. #inside
  19. #organs
  20. #mollusk
  21. #between