Describe the white blood cell’s role in protection against infection

Think of white blood cells as your immunity cells. In a sense, they are continually at war. They flow through your bloodstream to battle viruses, bacteria, and other foreign invaders that threaten your health. When your body is in distress and a particular area is under attack, white blood cells rush in to help destroy the harmful substance and prevent illness.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.