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Bacteria are single-celled microorganisms that belong to the kingdom Monera. They can be found in nearly every environment on Earth and are essential to many ecological processes. Bacteria are diverse and can come in many different shapes, including spheres, rods, and spirals. They can be aerobic, meaning that they require oxygen to survive, or anaerobic, meaning that they do not require oxygen. Some bacteria are harmful to humans, while others are beneficial, such as those that live in our gut and help with digestion.
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