+Cyanobacteria are ancient [Bacteria](/wiki/bacteria) that harness sunlight, vital architects of Earth's early atmosphere. These microscopic organisms, often called blue-green algae, generate most of the [Oxygen](/wiki/oxygen) we breathe, paving the way for complex life.
+## See also
+- [Photosynthesis](/wiki/photosynthesis)
+- [Algae](/wiki/algae)
+- [Prokaryote](/wiki/prokaryote)
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