Which process describes the series of events cells undergo as they grow and divide?

The cell cycle is the correct answer as it specifically refers to the series of events that cells go through as they grow and divide. This process is crucial for growth, tissue repair, and reproduction in living organisms. The cell cycle consists of several stages, including interphase (where the cell prepares for division), and mitotic phase (where the cell actually divides). During interphase, the cell undergoes growth and DNA replication, leading to the formation of two daughter cells.

In contrast, apoptosis refers to the programmed cell death that occurs when cells no longer need to be replicated or are damaged. While apoptosis is an essential aspect of maintaining health, it does not describe the growth and division process.

Cell differentiation involves the process by which a less specialized cell becomes a more specialized cell type. This is a critical aspect of development and the formation of different tissues, but it is not directly about the cell's growth and division cycle.

Cellular respiration is the biochemical process by which cells convert nutrients into energy. It plays a significant role in providing the energy necessary for various cellular activities, but again, it does not describe the growth and division process itself.

Understanding the cell cycle is fundamental for grasping how organisms grow and maintain their body functions through cellular processes.