Cyanobacteria (formerly blue-green algae) are among the most ancient organisms on Earth. These photosynthetic organisms can be single-celled, connected in a filamentous form as shown here, or arranged in simple colonies. Cyanobacteria are capable of enduring a wide variety of environmental conditions ranging from freshwater and marine habitats to snowfields and glaciers. They are capable of surviving and flourishing even at extremely high temperatures.
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