Animal cells do not require a cell wall or central vacuole because they do not need the structural support that a cell wall provides. Animal cells are surrounded by an extracellular matrix that provides the necessary support. The central vacuole is not necessary in animal cells as they do not need to store large amounts of water or other substances as plant cells do. Instead, animal cells have other organelles such as lysosomes, which play similar roles.
In three to five sentences, compare the process of digesting food in an amoeba (unicellular) to those in a mouse (multicellular) .
