Why is the blood red in color?
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Answer:
it contains a red coloured pigment called haemoglobin that is rich in iron. this gives blood it's red colour.
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Human blood is red because hemoglobin, which is carried in the blood and functions to transport oxygen, is iron-rich and red in color. Octopuses and horseshoe crabs have blue blood. This is because the protein transporting oxygen in their blood, hemocyanin, is actually blue
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