Cell division used for asexual reproduction by unicellular organisms

Binary fission.

Explanation:

Reproduction may be defined as the process of production of the offspring to produce more of its own kind. Two main types of reproduction are sexual reproduction and asexual reproduction.

Asexual reproduction involves only one one parents and produce the offspring that has same genetic material. Binary fission is the main type of the cell division used by unicellular organism. The cell divide into two daughter cells with the same genetic constituents.

Thus, the answer is binary fission.

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