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Scientists find oldest-known fossilized digestive tract -- 550 million years

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  • Scientists find oldest-known fossilized digestive tract -- 550 million years

    An analysis of tubular fossils provides evidence of a 550-million-year-old digestive tract -- one of the oldest known examples of fossilized internal anatomical structures -- and reveals what scientists believe is a possible answer to the question of how these animals are connected.

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