They don't have the gene that leads to the creation of the protein for coloring.
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The pigment containing iron is called hemoglobin. Hemoglobin is a protein found in red blood cells that carries oxygen throughout the body.
Human body waste is called "excrement" or "feces."
Anatomy
Haemoglobin (Hb) is a red coloured protein pigment found within Red Blood CellsIt consists of two basic partsthe iron containing pigment haemthe protein globin
commensals