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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
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.n ameoba, a simple unicellular organism. Organisms can consist of one cell to many cells: 1  Simple organisms may be unicellular (consist of one cell). 2  Complex organisms are multicellular (consist of many cells).