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Cells that enter G0 phase
Solution:
The G₀ phase is the quiescent stage of the cell cycle. Cells in this phase exit the G₁ phase and enter an inactive state where they do not proliferate. However, they remain metabolically active. Option (1) is incorrect because cells in G₀ are metabolically active. Option (2) is incorrect because some cells in G₀ can re-enter the cell cycle and proliferate under certain conditions. Option (3) is incorrect; duplication of cell organelles primarily occurs during the G₁ and S phases, not G₀.