"the following are steps in phagocytosis: (1) bacterium is digested by lysosomal enzymes; (2) phagocyte approaches bacterium; (3) phagocytic vesicle fuses with lysosome; and (4) phagocyte engulfs bacterium, forming a phagocytic vesicle. in which order do these steps occur? a. 4-2-3-1 b. 2-4-3-1 c. 2-3-4-1 d. 4-1-3-2