Which characteristic involves cleavage and fracture? a) the way a mineral breaks apart b) the color of a minerals powder c) the light that is reflected from a minerals surface d) the number and angle of crystal faces of a mineral

The Answer Is A. Hope This Helps ;P

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.