File name: cyanobacteria_richard_droker_620.jpg Original Resolution: 620 × 413 File Size: 130 KB (MIME Type: image/jpeg) Date Published: February 2, 2021 Download file View image caption Ancestors of modern cyanobacteria (blue-green algae) may have been the first oxygen producers on planet Earth, and ushered in significant changes in climate. CC license by Flickr user Richard Droker.
