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A microorganism  is a microscopic living organism, which may be single celled or multicellular..Microorganisms are very diverse and include the bacteria and archaea and almost all the protozoa. They also include some fungi, algae, and certainanimals, such as rotifers. Many macroscopic animals and plants have microscopic juvenile stages. Some microbiologists also classify viruses  as microorganisms, but others consider these as nonliving.Microorganisms live in every part of the biosphere.They are present everywhere that is in our food,clothes.Some are good microorganisms but some are very dangerous .Microorganisms are crucial to nutrient recycling in ecosystems as they act as decomposers. As some microorganisms can fix nitrogen, they are a vital part of the nitrogen cycle,.But A small proportion of microorganisms are pathogenic and cause disease and even death in plants and animals.Microorganisms are often referred to as microbes, but this is usually used in reference to pathogens.
some examples are-bacteria,chlamydomo

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