The first organisms that oxygenated the atmosphere were a. cyanobacteria b. phototrophic organisms c. anaerobic organisms d. all of the above
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Step 1: At the initial evolution of Earth, there was no oxygen present in the atmosphere. Show more…
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Cyanobacteria were the first photosynthetic organisms. How were they responsible for allowing higher life forms to evolve? A. They released oxygen, which mixed to form iron, and later ferrous oxide, in the air. B. They released carbon dioxide, which evolving animals needed. Or C. They released oxygen, which created the ozone layer, resulting in reduced mutation rate.
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The first organisms that oxygenated the athmosphere were a. cyanobacteria b. phototrophic organisms C. anaerobic organisms d. all of the above
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