According to the new research of the University of Washington earth’s oxygen levels vary most of the times. it is found that it fluctuates more than once hundreds of millions of years
As per the research, there is found an evidence which hints that a much earlier “whiff” of oxygen in Earth’s faraway past in the climate and on the surface of a huge extent of ocean which showing that the oxygenation of the Earth was a compound process in which it is occurring again and again and failing over a wide stretch of time.
An evidence which has found may have insinuation in the search for life beyond Earth. there will be bought a strong new ground- and space-based telescopes which will be able to inspect the atmospheres of outlying planets.

This work could help keep astronomers from excessively ruling out false negatives and colonize planets which may not appear at first to be so due to unnoticeable oxygen levels.
According to the Matt Koehler, a UW doctoral student in Earth and space sciences “The production and destruction of oxygen in the ocean and atmosphere over time was a war with no evidence of a clear winner, until the Great Oxidation Event,”
“These transient oxygenation events were battles in the war when the balance tipped more in favor of oxygenation.”

An evidence of an episode In 2007 found by the co-author Roger Buick, UW professor of Earth and space science that a “whiff” of oxygen some 50 million to 100 million years before the Great Oxidation Event.
In a research, Two different isotopes of oxygen, nitrogen isotopes and the element selenium, material used by the researcher in such a way through which the presence of oxygen can be supposed
The activity of certain marine microorganisms is revealed by The nitrogen isotopes that use this nitrate for energy.
A plentiful selenium in the shallow hole Found by the team, explained that it came from the nearby land, not making it to deeper water.