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GENERAL KNOWLEDGE ™ 💡 GENERAL KNOWLEDGE ™ 💡 @general_knowledgetm · 69.1K subscribers
Post #9668 1.32K
Octopuses have three hearts and blue blood. Two hearts pump blood to the gills, while the third circulates it to the rest of the body. Their blood turns blue because it relies on copper instead of iron to carry oxygen.

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