Tubular structures found in black shale from a quarry in Gabon dating from 2.1 billion years ago - providing evidence of the earliest-known mobile organisms on Earth - are shown in Poitiers, France in this undated handout photo obtained February 11, 2019. Abderrazak Albani/IC2MP/CNRS/Universite de Poitiers/Handout via REUTERS

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