The process of cell division that forms incomplete cells or gametes is called meiosis.

Here's why:

* Meiosis is a specialized type of cell division that reduces the number of chromosomes in a cell by half. This is essential for sexual reproduction.

* Gametes (sperm and egg cells) are the "incomplete cells" produced by meiosis. They have only half the number of chromosomes as the original cell.

* When two gametes fuse during fertilization, they create a zygote with a complete set of chromosomes.

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