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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
A DNA contains codes for proteins, which are necessary for the growth and functioning of an organism. B DNA separates into long single strands that make up each part of an organism. C DNA produces the energy an organism needs in order to grow. D DNA folds into the nucleus of each of the cells of an organism.