On Earth, there are phenomena with red, blue, green and yellow blood.
Blood can have different colors depending on its components. Most vertebrates have red blood due to its iron content. Animals that have copper in their blood tend to have a blue color (for example, blue blood in octopuses, squids, crustaceans, spiders). Vanabine makes the blood yellow (for example, beetles, sea squirts, holothurians have yellow blood), chlorocruorin makes the blood green (worms, leeches), and hemerythrin gives the blood a purple hue (several types of worms).
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