Longest part of cell's life cycle?
The longest stage is the resting phase or the interphase which occur between cell divisions.
The stages of the cell cycle are in order as follows (not including sex cells): Interphase, Mitosis, and Cytokinesis. Interphase is the longest stage of the cell cycle, however don't confuse the cell cycle as the same thing as mitosis. Mitosis is merely a part of the cell cycle. The phases of mitosis are: Prophase, Metaphase, Anaphase, and Telophase. Of these phases, Metaphase is the longest.
The cells on the epidermis have definite life cycle. Each epidermal cell begins life deep in the epidermis, where cells divide to form new cells. The new cells gradually mature and move upwards in the epidermis as new cells form beneath them. After about two weeks, the cells die and become part of the surface layer of the epidermis. Hope this helps!!