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B
Ca2+
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C
Cu2+
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D
Fe2+
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Solution
The correct option is DFe2+
Erythropoiesis is the process of formation of Red blood cells (RBCs). It occurs in liver, spleen and lymph nodes in foetus while after birth, this process occurs in bone marrow. The elements necessary for formation of RBCs are iron (Fe2+), vitamin B12 and folate. This process takes about 72 hours. The process of erythropoiesis is stimulated by erythropoietin which is secreted by kidneys when there is less oxygen in the circulating blood.