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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
  The three purposes of cell division are repair, reproduction, and growth. In multicellular organisms, cell division is essential for three  major functions: growth that â¦ make up the lining of your throat have  a short life span.here are other uncommon branches of Science, but they all fall under these three categories. The actual answer is that the three main divisions of science are Physical Science's, Biological or Life Science's and Social Science's.