Latest assessment suggests life on Earth may have begun 3.2B years ago. University of Washington in USA and University of Johannesburg in South Africa researchers found evidence that life existed on Earth 3.2 billion years ago.
Their findings are based on analysis of rock samples collected in South Africa and northwestern Australia and range in age from 2.75 to 3.2 billion years old.
The article article below is about the biotic process of NITROGEN FIXATION. Research shows there was plentiful nitrogen 3.2 billion years ago to sustain the most basic life forms, including bacteria, viruses and other organisms. While life can exist without oxygen, nitrogen is an essential building block for genes.
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http://www.readcube.com/articles/10.1038%2Fnature14180 … Isotopic evidence for biological nitrogen fixation by molybdenum-nitrogenase from 3.2 Gyr