A cell spends a majority of its life in which phase?

inter-phase

Explanation:

The Eukaryota cell spends most of its "life" in inter-phase of the cell cycle, which can be subdivided into the three phases, G1, S and G2. During inter-phase, the cell does what it is supposed to do. Though cells have many common functions, such as DNA replication, they also have certain specific functions.

Its spends it majority time in interphase