Do oysters have a heart?

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  1. #gills
  2. #muscle
  3. #lined
  4. #addition
  5. #which
  6. #adductor
  7. #lying
  8. #vessels
  9. #walled
  10. #blood
  11. #their
  12. #pumps
  13. #small
  14. #exchange
  15. #three
  16. #mantles
  17. #colorless
  18. #across
  19. #oysters
  20. #heart
  21. #gases
  22. #parts
  23. #under
  24. #chambered