Do octopus have 3 hearts?

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Tags

1. #octopus
2. #circulates
3. #oxygen
4. #hearts
5. #systemic
6. #branchial
7. #heart
8. #octopuses
9. #gills
10. #round
11. #three
12. #through
13. #transport
14. #haemocyanin
15. #contains
16. #blood
17. #protein
18. #copper