Answer: a. phagocytosis
Step-by-step explanation:
Phagocytosis is a process by which some living cells engulf other living cells or particles. The living cells which engulf other cells are called as phagocytes. These may be free-living one-celled organisms such as amoeba or white blood cells. The white blood cells provide immunity by engulfing the pathogenic bodies such as bacteria, virus and others.
Phagocytosis is not commonly used to exchange the water and solutes among the bodily fluid compartments. But other processes such as flitration, active transport, diffusion and osmosis are commonly used to allow such exchange.