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" ... Acidobacteria, like the example shown here, are likely some of the first photosynthetic organisms of... [+] all. They have no internal structure or membranes, loose, free-floating DNA, and are anoxygenic: they do not produce oxygen from photosynthesis. These are prokaryotic organisms that are very similar to the primitive life found on Earth some ~2.5-3 billion years ago. ... "
" ... And although the only example of life as know it exists on our oxygen and ozone-rich planet, we also know that life could emerge without oxygen. When life arose some 3.8 billion years ago, it did so under an anoxygenic atmosphere. And for the first 1.3 billion years of its existence lived under these anaerobic conditions. ... "