The cell division occurs to prevent cells from growing to an excessive size, to create new cells as an organism grows, and to replace tissues and cells that have been injured.
Cell division is the process by which unicellular creatures reproduce, whereas in multicellular organisms, it is the process by which tissues grow and are maintained. The reproduction of a complete unicellular organism, the development of gametes (eggs and sperm) for sexual reproduction in multicellular animals, and the growth and repair of tissues are the three primary roles of cellular division.
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