Earth's first lifeforms may have started moving as far back as 2.1 billion years ago, suggests a new study of small fossilized tunnels found in Gabon. This is 1.5 billion years earlier than previously thought.

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Earth's first lifeforms may have started moving as far back as 2.1 billion years ago, suggests a new study of small fossilized tunnels found in Gabon. This is 1.5 billion years earlier than previously thought.