Question

why blood is in red colour ?

Answer 1

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 redbecause of the interaction between iron and oxygen.
and the main reason is hemoglobin
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Answer 2

blood is red in colour because hemoglobin is present. ....