The distinctive 鈥渇ecal prints鈥� of microbes potentially provide a record of how Earth and life have co-evolved over the past 3.5 billion years as the planet鈥檚 temperature, oxygen levels, and...
An analysis of sulfide ore deposits from one of the world鈥檚 richest base-metal mines confirms that oxygen levels were extremely low on Earth 2.7 billion years ago, but also shows that microbes were...
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