What is the primary reason cells undergo mitosis?

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Mitosis is a type of asexual reproduction where a single cell divides into two identical daughter cells. The major purpose of mitosis is to replace worn out cells.
Meiosis is a process where a single parent cell divides twice to produce four daughter cells. These four daughter cells have only half of the chromosomes of the parent cell, making them haploid cells (haploid means a half set of chromosomes). Meiosis produces our sex cells, called gametes (sperm in males and eggs in females).

What Is the Primary Reason Cells Undergo Mitosis