Here's why:

* Cell plate formation: During cytokinesis (the division of the cytoplasm), plant cells form a cell plate in the middle of the dividing cell. This cell plate is made of cellulose and other cell wall materials. It gradually grows outward until it fuses with the existing cell walls, creating two separate daughter cells.

* Animal cells: Animal cells lack cell walls. Instead, they undergo cytokinesis through a process called cleavage furrow formation. This involves a constriction of the cell membrane, pinching the cell in two.

Therefore, while both plant and animal cells undergo cell division, only plant cells develop a cell plate due to their unique cell wall structure.