one important Cyanobaderia
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Explanation:
Cyanobacteria , also known as Cyanophyta, are a phylum consisting of both free-living photosynthetic bacteria and the endosymbiotic plastids that are present in the Archaeplastida autotrophic eukaryotes. The plastids are a sister group to the free-living Gloeomargarita. Cyanobacteria commonly obtain their energy through oxygenic photosynthesis. The oxygen gas in the atmosphere of earth is produced by cyanobacteria of this phylum, either as free-living bacteria or as the endosymbiotic plastids. The name cyanobacteria comes from the color of the bacteria (Greek: κυανός, romanized: kyanós, lit. 'blue'). Cyanobacteria, which are prokaryotes, are also called "blue-green algae", though some modern botanists restrict the term algae to eukaryotes. Cyanobacteria appear to have originated in freshwater or a terrestrial environment.