Both erythrocytes and leucocytes are formed in the
A
Bone marrow
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B
Thymus
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C
Arterial walls
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D
Lymph nodes
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Solution
The correct option is B Bone marrow
In humans, blood cells are formed in the bone marrow of long bones such as legs, arms, ribs, sternum and vertebrae. The formation of blood cells is known as hematopoiesis which takes place in the bone marrow.