PLEASE ANSWER THIS QUICKLY
Which of these statements is true?

A. Weathering and erosion affects all rocks on the earth's surface
B. Weathering and erosion only affects sedimentary rocks on the earth's surface
C. Weathering and erosion affects all rocks under the earth's surface
D. Rocks are unaffected by weathering and erosion

i think is is A:weathering and erosion affects all rocks on the earth's surface

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.