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single-celled microorganisms without a nucleus, classified as prokaryotes

Bacteria are single-celled microorganisms that lack a nucleus, classified as prokaryotes. They can be found in virtually every environment on Earth, from soil to water to the human body, where they play crucial roles in processes like digestion and nutrient cycling. Some bacteria are beneficial, such as those in the gut microbiome, while others can cause infections and diseases.

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