Final answer:
The cell cycle serves the purpose of reproduction in unicellular organisms, growth of multicellular organisms, and replacing dead cells.
Step-by-step explanation:
The purpose of the cell cycle is to perform various functions necessary for the growth and development of organisms. It involves the reproduction of unicellular organisms, the growth of multicellular organisms, and the replacement of dead cells. While it can change the function of cells under certain circumstances, this is not its primary purpose.
Learn more about Purpose of the cell cycle