Question

which makes the blood red in colour
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Answer 1

Blood has the presence of Haemoglobin which makes blood red in colour

Answer 2

Human blood is red because of the protein hemoglobin, which contains a red-colored compound called heme that's crucial for carrying oxygen through your bloodstream. Heme contains an iron atom which binds to oxygen; it's this molecule that transports oxygen from your lungs to other parts of the body

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