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The smallest species of organisms include various types of bacteria and archaea, which can be as small as 0.2 micrometers in diameter. One of the smallest known bacteria is Mycoplasma genitalium, while certain species of viruses, such as the circovirus, are even smaller, measuring around 20-25 nanometers. These microorganisms play crucial roles in ecosystems and can be found in diverse environments, often contributing to nutrient cycling and other essential biological processes.

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