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Explanation: But roughly 2.45 billion years ago, the isotopic ratio of sulfur transformed, indicating that for the first time oxygen was becoming a significant component of Earth's atmosphere, according to a 2000 paper in Science. At roughly the same time (and for eons thereafter), oxidized iron began to appear in ancient soils and bands of iron were deposited on the seafloor, a product of reactions with oxygen in the seawater.
Most important, how did the amount of atmospheric oxygen reach its present level? "It's not that easy why it should balance at 21 percent rather than 10 or 40 percent," notes geoscientist James Kasting of Pennsylvania State University. "We don't understand the modern oxygen control system that well."
The growth of microbial metabolism was aided by an increase in atmospheric oxygen.
What is a photosynthetic organism?
Photosynthetic organisms have been considered as an autotroph, able to produce organic substances from inorganic nutrients based on energy harvested from light.
Despite the fact that minuscule cyanobacteria were supplying the gas as a side effect of photosynthesis, Earth's first air and oceans were devoid of free oxygen. Around 2.4 billion years ago, the amount of oxygen in the atmosphere unexpectedly increased by several orders of magnitude in approximately 200 million years.
Atmospheric oxygen is the outcome of a change in a microbe's metabolism that occurred once in the earth's history.
Learn more about atmospheric oxygen here:
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