The original atmosphere of earth had little oxygen. what was the likely first source of oxygen that led to an oxygen atmosphere?

Question

Chemistry

Rory Russo

12 October, 14:53

The original atmosphere of earth had little oxygen. what was the likely first source of oxygen that led to an oxygen atmosphere?

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Brianna Stein · Answer 1

Answer is: c yanobacteria.

Cyanobacteria are a phylum of bacteria that obtain their energy through photosynthesis and are the only photosynthetic prokaryotes able to produce oxygen.

Cyanobacteria are thought to have converted the early oxygen-poor, reducing atmosphere into an oxidizing one, causing the Great Oxygenation Event which dramatically changed the composition of the Earth's life forms and led to the near-extinction of anaerobic organisms.