Final answer:
After development, liver cells do not stay in the G1 phase, they enter the G0 phase. Some cells, such as mature cardiac muscle cells and nerve cells, permanently remain in the G0 phase and do not divide.
Step-by-step explanation:
The statement is False. After development, liver cells do not stay in the G1 phase, they enter the G0 phase. The G0 phase is a resting phase of the cell cycle where cells are not actively preparing to divide. Some cells, such as mature cardiac muscle cells and nerve cells, permanently remain in the G0 phase and do not divide. However, liver cells can re-enter the cell cycle and divide if necessary.