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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
1-Some cells use mitosis as a means of reproduction. 2-Multicellular organisms use mitosis for growth 3-Mitosis is also used to replace injured cells and dead cells.