Why the colour of our blood is only red?

1.	Why the colour of our blood is only red?
Answer» Each hemoglobin protein is made up subunits called hemes, which are what give blood its red color. More specifically, the hemes can bind iron molecules, and these iron molecules bind oxygen. The blood cells are red because of the interaction between iron and oxygen. Due to presence of red pigment called haemoglobin

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