Why do crabs have blue blood and humans have red blood ?

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Solution

Horseshoe crabs have blue blood. Their blood contains no hemoglobin, instead using hemocyanin to carry oxygen. Hemocyanin contains copper, which gives the blood a blue color. ... Most arthropods have bluish bloodbecause of their cyanoglobin, which istheir oxygen carrying molecule like our hemoglobin (which is red).
due to hemoglobin human has red colour

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