Why would an iron deficiency cause anemia?

leukocytes require iron to produce antibodies
hemoglobin requires iron
oxygen attaches to iron dissolved in the blood
iron produces red blood cells in the bones

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the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.