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The immune system is the bodies defense against invaders and is located in all body tissues with concentration in the mucosal surfaces and skin.

Answer:Primary lymphoid organs: These organs include the bone marrow and the thymus. They create special immune system cells called lymphocytes. Secondary lymphoid organs: These organs include the lymph nodes, the spleen, the tonsils and certain tissue in various mucous membrane layers in the body

Explanation: BRAINLIEST pls

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