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They are found in every habitat on Earth and play a crucial role in various ecological processes. Bacteria are prokaryotic organisms, lacking a nucleus and other membrane-bound organelles. Instead, their genetic material floats freely in the cytoplasm. The Wikipedia page "Bacteria" provides a comprehensive overview of these microorganisms, addressing their characteristics, classification, and significance. It explores their diverse forms, highlighting the presence of bacteriophages, which are viruses that infect bacteria. The article also discusses their key metabolic pathways, including photosynthesis, fermentation, and respiration. Further, the page explains bacterial reproduction, illustrating both asexual and sexual modes of reproduction, such as binary fission and conjugation. It delves into various topics related to bacterial structure, including cell walls, membranes, and flagella. The evolutionary history of bacteria is explored, examining their emergence as the earliest life forms on Earth. The page explains their role in nutrient cycling, decomposition, and symbiotic relationships with other organisms. Additionally, the significance of bacteria in medicine and industry is discussed, highlighting their ability to cause diseases in humans and animals. The page further explores their role in the production of antibiotics, food, and various other commercial products. It also covers the study of bacteria, known as bacteriology, and the techniques employed in this field. Overall, the Wikipedia page "Bacteria" provides a comprehensive understanding of these microorganisms, discussing their features, classification, reproduction, evolution, and importance in various fields.