science

We may finally know what life on Earth breathed before the presence of oxygen

Billions of years ago, long before oxygen was readily available, the infamous toxic arsenic could have been the compound that breathed new life into our planet.

In the Atacama Desert in Chile, in a place called Laguna La Brava, scientists have been studying a purple strip of photosynthetic microbes that live in a hyper-salty lake permanently devoid of oxygen.

Phil Schwartz

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