Why do different animals have different blood colors? If red blood is caused by Red Blood Cells, do crabs have “Blue Blood Cells”?

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Why do different animals have different blood colors? If red blood is caused by Red Blood Cells, do crabs have “Blue Blood Cells”?

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The red color of red blood cells is due to hemoglobin which is the molecule they use to carry oxygen.

Horseshoe crab’s equivalent of our red blood cells use a different compound to carry oxygen, which is blue instead of red (because contains copper instead of iron).

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