Insufficient blood levels of cobalamin, essential for red blood cell maturation, is called: A) thalassemia. B) B₁₂ deficiency. C) pancytopenia. D) hypovolemia.

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Insufficient blood levels of cobalamin is called B₁₂ deficiency, also known as vitamin B12 deficiency. Thalassemia is a genetic disorder affecting the production of hemoglobin. Pancytopenia is a decrease in the number of all blood cells. Hypovolemia is a decrease in the volume of blood in the body.

Insufficient Blood Levels of Cobalamin, Essential for Red Blood Cell