E. Coli is classified as a prokaryote, having only one
cell and no nuclei. This unicellular bacteria is microscopic. Since it has only one
cell, it doesn't have organs or membranes. E. Coli and other prokaryotic bacteria can
live in places that would kill an multicellular organism, such as in places with high
radiation or places that are extremely hot, like natural hotsprings. Salmonella is
another unicellular organism you may be familiar
with.
Unlike unicellular organisms, multicellular organisms
are classified as eukaryontes and have many cell types; they are large enough to see
with the naked eye.
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