Q.

Both erythrocytes and leucocytes are formed in the             .

A. Bone marrow
B. Thymus
C. Arterial walls
D. Lymph nodes
Answer» A. Bone marrow
Explanation: Leukocytes are immune cells that protect your body from infection, and they are found throughout your body, including your blood. Just like erythrocytes, leukocytes are made in the bone marrow.
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