Which of the following statements is true?

a. all fires are bad for a forest environment.

b. earth's water supply does not need to be protected from pollution.

c. the extracting of underground resources always leads to a healthy environment.

d. soil can be considered a resource.

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.

age range would be the answer