Do all oysters have pearls?

Related questions

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2. Is Oyster cheaper than contactless?
3. Is Oyster card refundable?
4. What is an Oyster card and how does it work?
5. What are London zones 1 6?
6. What are the odds of finding a pearl in an oyster?
7. What is a London Oyster card for tourist?
8. Does London Pass include Oyster card?
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10. Why is the Oyster card called oyster?

Tags

1. #although
2. #mantle
3. #saltwater
4. #pearls
5. #internal
6. #organ
7. #called
8. #substance
9. #nacre
10. #produce
11. #minerals
12. #either
13. #oysters
14. #freshwater
15. #clams
16. #oyster
17. #often
18. #mussels
19. #environments