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Microorganisms are tiny living things, so small they can only be seen with a microscope. They are found virtually everywhere on Earth, from the deepest oceans to the highest mountains, and even inside other living organisms. This vast group includes bacteria, archaea, viruses, fungi, and protists. Bacteria and archaea are single-celled prokaryotes, meaning their cells lack a nucleus and other membrane-bound organelles. Viruses, while often studied alongside microorganisms, are not technically alive as they require a host cell to replicate. Fungi, like yeasts and molds, are eukaryotes, as are protists, a diverse group including algae and protozoa.

Microorganisms play crucial roles in ecosystems. Many are decomposers, breaking down dead organic matter and recycling nutrients, which is essential for plant growth. Others are producers, like photosynthetic bacteria and algae, forming the base of food webs. Symbiotic relationships are also common; for example, bacteria in our gut aid digestion and produce vitamins, while certain fungi form mutually beneficial partnerships with plant roots.

However, not all microorganisms are beneficial. Some bacteria and viruses are pathogenic, causing diseases in humans, animals, and plants. Understanding these pathogens is vital for developing treatments and preventing outbreaks. The study of microorganisms, known as microbiology, is a broad field with applications in medicine, agriculture, biotechnology, and environmental science.