Final answer:
Phagocytosis engulfs large particles while pinocytosis acquires extracellular fluid and solutes, both requiring ATP and involve the membrane forming vesicles.
Step-by-step explanation:
Phagocytosis is a form of endocytosis where a cell engulfs large particles or cells, a process commonly utilized by immune cells to eliminate invading pathogens. This cell eating involves the cell's membrane enveloping the target to create a phagocytic vesicle. Pinocytosis, on the other hand, also known as cell drinking, is responsible for the intake of extracellular fluid and dissolved substances into the cell through the creation of smaller membranous vesicles. Both phagocytosis and pinocytosis are active transport methods requiring energy in the form of ATP to transport substances into the cell.