Here's why:

* Cell Plate Formation: During telophase, the nuclear envelope reforms around the separated chromosomes, and the cytoplasm divides. In plant cells, a cell plate forms between the two daughter nuclei. This cell plate is made of cell wall material (cellulose, pectin, etc.) that grows outwards from the center of the cell.

* Cell Wall Formation: The cell plate eventually fuses with the existing cell walls, creating a new cell wall that separates the two daughter cells.

* Animal Cells: Animal cells do not form a cell plate. Instead, they use a process called cytokinesis where a cleavage furrow forms and pinches off the cell membrane to divide the cytoplasm.

Let me know if you have any other questions about cell division!