T<span>he cell requires oxygen, and eukaryotic cells are expensive to run. they require a lot of energy and nutrients, and oxygen is one such component. the oxygen is necessary for aerobic respiration, which allows the cell to do a lot, including evolve, proliferate, adopt new niches, habitats, biochemical habitats, sustain life in extreme conditions, and perhaps eventually co-operate with other cells and create multicellular life. Multicellular life is virtually impossible without aerobic respiration. </span>
5: the parasite and the host need each other
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MITOSIS results in the formation of a new cells with a full set of chrimosomes
Bacteria is not as complex as human and other animal lives, which means they need less energy and DNA to evolve in these ways.