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Why don't red blood cells have nuclei?

Answer

Red blood cells are the only cells in the human body that don't have a nucleus. This is an adaptation which allows the red blood cell to carry more oxygen, but the down side is that the cell cannot replicate itself. The iron in the body is used to make new red cells, which is why iron is such an important part of a person's diet.
1 Additional Answer
Because they don't need one. The nucleus of a cell is responsible for cellular activity including cell division. Blood cells don't divide, they are produced by other cells within bone marrow. RBC's are mainly a cell membrane surrounding a glob of hemoglobin and they lack most of the organelles associated with living cells.
Q&A Related to "Why don't red blood cells have nuclei?"
Red blood cells never contain a nucleus. they don't need it. RBC are made in bone marrow and destroyed in the spleen; they pick up and drop off gases based on oncotic pressures and
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In contrast to mammals, mature red blood cells in birds, reptiles and other "lower" vertebrates have a nucleus. The a-nucleated erythrocyte, as it is seen in mammals, is
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both found in blood
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One of the often recited rules in Biology is that all living things possess a nucleus. This is generally true but the red blood cell is a significant exception to this rule. It develops
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