Q: Which type of blood cells are not viewed as a part of the immune system?  

Answer: D

Red Blood Cells (RBCs) are the most common type of blood cell and are not part of the immune system. RBCs are responsible for carrying oxygen and carbon dioxide throughout the body. They are produced in the bone marrow and have a lifespan of about 120 days. Unlike other blood cells, RBCs do not contain a nucleus and are unable to divide. They are also unable to recognize and respond to foreign substances, making them unable to fight off infections.

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