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Oxygen
yes
Photosynthesis by plants
reacted out with oxygen as oxygen levels rose.
Oxygen
Oxygen
Oxygen
yes
Nitrogen and Oxygen.
oxygen
Photosynthetic bacteria produced oxygen, and as they continued to colonize the earth they produced more oxygen. Eventually all the oxygen sinks became saturated, and this resulted in the Great Oxygenation Event (GOE). Aerobic organisms would late evolve and utilize the free oxygen.
oxygen
Nitrogen and Oxygen.
oxygen
The majority of the atmosphere of Mars resulted from the outgassing of the planet's interior. This occurred very early in its formation.
No! Stromatolites converted the toxic atmosphere into a breathable one.
no