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Haemoglobin is a protein present in red blood cells, responsible for transporting oxygen from the lungs to cells in the body. Haemoglobin gives red blood cells their distinctive colour. Haemoglobin levels differ between individuals, but men usually have higher haemoglobin levels than women.
I would say that carbon dating is technically the most efficient because it is scientifically proven that a certain amount of carbon atoms will degrade after an organism is dead for a certain amount of time.
