What is an atom trying to do when it combines with other
atoms?
A. produce a reaction Ting
B. change state of matter
C. become less stable
D. become stable

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.

not sure if this is what you'r looking for eubacteria and archaebacteria