Is the attraction of water molecules to one another, while is the attraction of water molecules to other polar substances. a: adhesion; cohesionb: cohesion; adhesionc: crossed outd: surface tension; adhesion

Correct B). Cohesion; adhesion

Cohesion is defined as the force of attraction between the same substances while that of adhesion is defined as the force of attraction between the different type of substances.

Cohesion is the force that is known to hold the hydrogen bond together in order to create surface tension of water molecules. While that of adhesive force is responsible for pulling the water molecules towards the other molecules.

Hence, the correct answer would be ''Cohesion; adhesion''

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.