Final answer:
The majority of a cell's life is spent in interphase, which includes the G1, S, and G2 phases, and is focused on growth and preparation for cell division.
Step-by-step explanation:
The majority of time during a cell's life is spent in interphase. Interphase is a period in the cell cycle that precedes mitosis, consisting of the G1, S, and G2 phases. During interphase, the cell undergoes normal growth processes and prepares for cell division. The G1 phase is focused on cell growth and protein synthesis, the S phase involves DNA replication, and the G2 phase involves further growth and protein synthesis. Overall, interphase is crucial for a cell to meet the internal and external conditions necessary to eventually enter the mitotic phase, where the cell will divide to form daughter cells.