Pls help ASAP!! A cell needs to divide because as a cell gets bigger, in interphase (G1), it uses up food and oxygen more quickly, places more demands on its DNA, and has more trouble moving enough materials across the cell and through the cell membrane. The cell then replicates its DNA (S Phase), which means it makes an identical copy of, or SYNTHESIZES, its DNA. The next phase (G2) is preparation for mitosis. Cell Division consists of 2 parts: Mitosis (4 phases that divide the nucleus) and Cytokinesis (the division of cytoplasm and the cell membrane). A cell may enter a resting phase (G0), where it will remain until there is a need for the cell to divide. Cancer cells cannot enter the G0 phase, and therefore repeat the cell cycle continuously.