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Simple organisms may be unicellular, consisting of just one cell, while more complex organisms are multicellular. There are two types of cell division. Mitosis is used for growth and repair and produces diploid cells identical to each other and the parent cell. Meiosis is used for sexual reproduction and produces haploid cells different to each other and the parent cell. Unicellular vs multicellular An ameoba, a simple unicellular organism
Cell division of a single-celled organism, known as binary fission for prokaryotes and mitosis for eukaryotes, is for reproductive purposes only. Cell division of multicelluar organisms can occur for a couple different reasons. Mitosis produces somatic cells, or cells other than gametes, and occurs for growth or to replace older cells.