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|Bacteria, singular bacterium, belong to a domain of prokaryotic microbes, also classified as the Bacteria kingdom by some taxonomists. Bacterial cells do not contain a nucleus and rarely have membrane-bound organelles. Typical size is a few micrometers, with shapes ranging from spheres to rods and spirals. Bacteria were among the first life forms to appear on Earth, descending from a common ancestor with domain Archaea. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and deep portions of the Earth's crust. They also live in symbiotic and parasitic relationships with plants and animals, which belong to domain Eurkaryota. There may be ten times as many bacterial cells in our bodies as there are human cells.
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