In the article from livescience.com it talks about the Earth's oldest rocks on the planet.The oldest rock is 4 billion years old, however, fossils from Australia might be remains of microbial mat that extracted energy from the sun only 3.5 billion years ago.In Greenland some of the rock fossils might have had cyanobacteria generated from about 3.7 billion years ago. Elizabeth Bell from the University of California, Los Angeles questions if there was life even before this whose remnants disappeared with the planet's oldest rocks. DIfferent approaches to find Earth's earliest life suggests that oceanic hydrothermal vents might have hosted the first living things.
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