bacteria
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Bacteria common noun bacteria, singular bacterium constitute a large domain of prokaryotic microorganisms. Typically a few micrometers in length, bacteria have a number of shapes, ranging from spheres to rods and spirals. Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep portions of Earth's crust. Bacteria also live in symbiotic and parasitic relationships with plants and animals.
There are typically 40 million bacterial cells in a gram of soil and a million bacterial cells in a milliliter of freshwater. There are approximately 5×1030 bacteria on Earth, forming biomass that exceeds that of all plants and animals. Bacteria are vital in many stages of the nutrient cycle by recycling nutrients such as the fixation of nitrogen from the atmosphere. The nutrient cycle includes the decomposition of dead bodies and bacteria are responsible for the putrefaction stage in this process.
Bacteria are microscopic, single-celled organisms that thrive in diverse environments. These organisms can live in soil, the ocean, and inside the human gut.
You can find microbes everywhere they're extremely adaptable to conditions and survive wherever they are.
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