20 points!

Compare common environmental risks in indoor and outdoor environments.

A

Explanation:

So there are three environments for determining personal environmental risk. ... Your indoor environment. ... Oftentimes, the air quality inside a building is much worse than that outside the building.

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.