They are produced by specialized white blood cells called B lymphocytes<span> (or B cells). </span>
Values are external influence
Headaches are often a sign of dehydration. When somebody stays out in the sun too long and starts getting dehydrated their head will start pounding because their is not enough water to keep you from thinking about being cooled down. So the answer would be dehydration.
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A. Draws and analyzes blood
