Ancient Microbes Exploited Oxygen Before Atmosphere's Rise

Researchers from MIT have discovered evidence suggesting that some microbes adapted to use oxygen hundreds of millions of years before it formed a stable part of Earth's atmosphere. This investigation focused on a crucial enzyme involved in oxygen consumption, tracing it back to the Mesoarchean era, predating the Great Oxidation Event. Cyanobacteria, known for producing oxygen via photosynthesis, likely shared their environment with these early aerobic microbes. As cyanobacteria produced oxygen, it was swiftly consumed, slowing the gas's atmospheric buildup. This innovative adaptation hints at an unexpectedly early use of oxygen on Earth, revealing new insights into the planet’s evolutionary history.