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Which animal's blood is blue in Colour?

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Horseshoe crab, octopus, snails, spiders
User Usobi
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Answer:

The animal whose blood is blue in color is the horseshoe crab. Their blood contains a copper compound called hemocyanin, which gives it a blue tint instead of the red color found in the iron-based hemoglobin of human blood. Horseshoe crab blood is also valuable for medical purposes as it contains a substance that can detect endotoxins, which are harmful substances produced by bacteria.

User Savio
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