Question

Give scientifict reasion
1] human blood is red colour​

Answer 1

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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.

Answer 2

due to presence of haemoglobin

and haemoglobin contains mostly iron due to which blood has red colour