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oxygen
No! Stromatolites converted the toxic atmosphere into a breathable one.
oxygen
oxygen
Unbreathable. Lots of CO2 and methane and hydrogen & no oxygen. Nitrogen was about the same.
oxygen
It is a byproduct of the life processes on Earth. Earth's early atmosphere contained no Oxygen, but Earth was slowly Terra-formed by life and obtained an Oxygen rich atmosphere.
No! Stromatolites converted the toxic atmosphere into a breathable one.
oxygen
Oxygen
Oxygen
cyanobacteria
oxygen
reacted out with oxygen as oxygen levels rose.
Carbon doixide
True
photosynthesis by cyanobacteria