Red Blood cells are produced by the

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(c) Bone marrow — Red blood cell is the most important cell of blood. It is the largest in number and constitutes 40% of the total blood. This is the most convenient and widespread means of taking oxygen from the respiratory organs of vertebrate animals and delivering it to the cells of various parts of the body. There is no nucleus in this cell. Its average age is 120 days. Red blood cells are produced in the bone marrow in adult humans and in the spleen or liver in embryonic development.

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(A) Liver

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(B) Some hormonic gland

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(D) Heart

Red Blood cells are produced by the

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