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evolutionary experimentation with motility may have encountered setback relatively soon after Gabon organisms lived because of dramatic drop in atmospheric oxygen 2 The evolutionary experimentation with motility may have encountered a setback relatively soon after the Gabon organisms lived because of a dramatic drop in atmospheric oxygen 2 NegativeWASHINGTON Scientists have discovered in 2 http://www.reuters.com/places/africa/article/us-science-mobility/earths-earliest-mobile-organisms-lived-2-1-billion-years-ago-idUSKCN1Q029U2019-02-12