Earth Breathed This Before Oxygen: Incredible New Discovery – Dual Dove

Billions of years ago, way long before oxygen was available, the infamous poison arsenic is said to be the compound that Earth breathed. 
Scientists realized research in Chile’s Atacama Desert, an area known as Laguna La Brava. They studied a purple ribbon of photosynthetic microbes existing in a hypersaline lake that’s free of oxygen permanently.
According to the research, that system is the only one on Earth where scientists could find a microbial mat that worked just fine in the absence of…

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