Answer: 2, 4, 3 and 1
Explanation: option 2: phagocyte approaches bacterium. The phagocyte is attracted to the bacterium.
Option 4: phagocyte engulfs bacterium, forming a phagocytic vesicle. The bacterium is engulfed by the phagocytes leading to the formation of a food vesicle.
Option 3: phagocytic vesicle fuses with lysosome. Lysosomes in the phagocytes fuses to the vesicle formed and;
Option 1: Bacterium is digested by lysosomal enzymes. The lysosomes secret enzymes that with digest the bacterium.