Which weather event is capable of destroying homes and uprooting trees due to a low pressure area added center

The answer is; tornado.

They form during thunderstorms. When cool-dry airmass meets with warm- moist air mass, the difference in densities creates a front as the warm air begins to rise above the cool air. Changes in wind direction cause the front to cycle and transform into a funnel and the winds begin to rotate around a center at very high speeds. The low pressure (compared to the ambient) in the center is what causes the tornado to fling objects  and destroy.    

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.