Your question is incomplete, but perhaps you should have a crack at wikipedia under 'oxygen catastrophe'.
Yes it is was
The oxygen revolution refers to the time in Earth's history when oxygen levels in the atmosphere significantly increased due to the photosynthetic activities of early algae and eventually land plants. This led to the evolution of aerobic organisms that could utilize oxygen for respiration, paving the way for more complex life forms to thrive.
false
True. An oxygen molecule typically consists of two oxygen atoms.
It is true. Ozone is an allotrope of oxygen.
The haitian revolution a true revelution, because it was led by the true slaves who were willing to sacrify everything to earn their freedom, and to be free from oppression. And it was the only real slaves revolution in the univers story period.
True, but only to a minor extent.
They Are Isotopes of oxygen!
No, oxygen is not magnetic.
The Oxygen Revolution, Cyanobacteria has been tremendously important in shaping the course of evolution and ecological change throughout earth's history.
true
True, fire must have oxygen to burn.