Blood is red because it is made up of cells that are red, which are called red blood cells. But, to understand why these cells are red you have to study them on a molecular level. Within the red blood cells there is a protein called hemoglobin. Each hemoglobin protein is made up subunits called hemes, which are what give blood its red color.
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Karthik Jandhyala answered this
Blood appear in red because our body has red coloured cells
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Aayush Shrivastava answered this
Our blood appears red because of the Red Blood Cell (RBC)
