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D Bacteria are a type of microscopic organism,or microbe. Each one consists of a single cell.That cell has a simple struc- ture.A bacterium does not contain a command center.Nor does it contain structures that do specific jobs.That makes bacterial cells prokaryotes(原核生物). Bacteria live almost everywhere on Earth.Some live on the seafloor.Others make their home in soil.Still other bacteria live inside our bodies.In fact,there are more bacterial cells in the human body than human cells.Some of these bacteria do useful jobs.Bacteria in our guts,for instance,help digest food.The bacteria and other microbes living inside a person's body make up that person's microorganism groups.