Cyanobacteria: General Description
Cyanobacteria carry out oxygen-evolving, plant-like photosynthesis. Earth's oxygen-rich atmosphere and the cyanobacterial origin of plastids in plants are the two major evolutionary contributions made by cyanobacteria. Certain cyanobacteria are able to carry out nitrogen fixation.
The oxygenation of the atmosphere by cyanobacteria allowed multicellular organisms to evolve into plants and animals.
Cyanobacteria played an important role in the evolution of Early Earth and the biosphere. They are responsible for the oxygenation of the atmosphere and oceans since the Great Oxidation Event around 2.4 Ga, debatably earlier. ... Recently, new biosignatures specific to cyanobacteria were proposed.
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