Question

where are blood formed in your body​

Answer 1

In the human adult, the bone marrow produces all of the red blood cells..
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Answer 2

In the human adult, the bone marrow produces all of the redblood cells, 60–70 percent of the white cells (i.e., the granulocytes), and all of the platelets. The lymphatic tissues, particularly the thymus, the spleen, and the lymph nodes, produce the lymphocytes (comprising 20–30 percent of thewhite cells).