Question

Human blood is red coloured why is it so?

Answer 1

Answer:

human blood is red because it contains red blood cells which are red in color

Answer 2

Answer:

Blood is red because it is made up of cells that are red, which are called red blood cells.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.