Scientists have calculated how long it takes for air to appear on the planet
A sharp increase in oxygen concentration due to cyanobacteria occurred about 2.45 billion years ago.
It was previously known when the amount of oxygen on Earth increased dramatically. However, new studies have shown how long ago this gas originated. It is thanks to them that the atmosphere of the Earth has changed.
Previously, scientists only knew that a sharp increase in oxygen concentration due to cyanobacteria occurred approximately 2.45 billion years ago. Scientists gave this phenomenon the name – Big Oxidative Event.
The study showed that cyanobacteria produced oxygen earlier, but it was spent on the oxidation of rocks. Over time, the oxygen concentration increased dramatically and affected the planetary atmosphere.
Using gene analysis, scientists have determined that all modern species of cyanobacteria are descendants of one ancestor.
The ancient cyanobacteria appeared approximately 2.9 billion years ago. It was then that photosynthesis emerged- conversion of carbon dioxide into oxygen by living organisms.
Scientists note that there were not so many ancient cyanobacteria, so there was no high concentration of oxygen. Subsequently, new cyanobacteria began to photosynthesize on a large scale – and this is how the oxygen boom occurred.
Oxygen is exhaustive
Scientists from the Georgia Institute of Technology stated that the amount of oxygen on Earth will constantly decrease. The study showed that in about a billion years, oxygen levels will decrease to the level of the Archean era – then the O2 concentration was 20-30 percent. Large forms of life, according to scientists, will not be able to exist in such an environment, but the life of microbes and bacteria will continue.
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