Question

which animal have blue blood​

Answer 1

Snails, spiders and octopi have something in common- they all have blue blood! We're not talking in the sense of royalty, these creatures literally have blue blood. So why is their blood blue and ours red

Answer 2

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Horseshoe , crab, octopus, lobster, spider Hemocyanin contains copper that binds to oxygen, making the blood appear blue.