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At first glance, stromatolites and their close relatives, microbial mats, can look like little more than dark, ancient rocks. In reality, they are densely packed, layered communities built by microbes.
Billions of years ago, before animals and plants existed, stromatolites helped release some of the earliest oxygen into Earth's atmosphere. Now, a study published in Current Biology suggests these unusual formations may also preserve clues to another ma...
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