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Early fossils with guts, segmented bodies and other sophisticated features reveal a revolution in animal life — before the Cambrian explosion.
Organisms named Fractofusus cover the sea floor some 560 million years ago, in a reconstruction of fossils from Newfoundland, Canada. Credit: Dr Charlotte G. Kenchington
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Nature 586, 662-665 (2020)
doi: https://doi.org/10.1038/d41586-020-02985-z
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