Answer the following question given this paragraph: White blood cells are larger than red blood cells, but there are far fewer of them. Their role is to defend the body in various ways. For example, white blood cells called phagocytes engulf and destroy microorganisms and debris in the blood. Q: Which blood cells serve to defend the body in various ways? Choices: - helper blood cells - blue blood cells - red blood cells - white blood cells A:
white blood cells