Answer:
the 3rd one i believe......
White blood cells are an important component of your blood system, which is also made up of red blood cells, platelets, and plasma.
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Although your white blood cells account for only about 1% of your blood, their impact is significant. White blood cells, also called leukocytes, are essential for good health and protection against illness and disease.
muscular and skeletal the bones support the body and the muscle relax and contract to move the bones
