A new theory explains why and how the earth evolved from an oxygen-deficient environment to the modern oxygenated world with the ocean playing a significant role in the process.
For the first 2 billion years of Earth’s history, there was barely any oxygen in the air. While some microbes were photosynthesizing by the latter part of this period, oxygen had not yet accumulated at levels that would impact the global biosphere.Bu
There was barely any oxygen in the air for the first 2 billion years of Earth's history and though some microbes were photosynthesizing by the latter part of this period, accumulation of oxygen had not reached levels that would impact the global biosphere.
There was barely any oxygen in the air for the first 2 billion years of Earth s history and though some microbes were photosynthesizing by the latter part of this period, accumulation of oxygen had not reached levels that would impact the global biosphere.