Assertion: cyanobacteria's structure | /r/CapableOf | call stromatolite
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text: On a concluding note, many geologists are of the opinion that cellular life may have existed millions of years before the signs appear in the fossil record, and believe that the study of rock-like structures called stromatolites and microbially-induced sedimentary structures might help them find traces or origins of cellular life or early life forms on Earth.