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old worm fossilGood News Network
•75% Informative
A 520-million-year-old worm fossil has solved the mystery of how modern insects, spiders and crabs evolved.
The fossil, named Youti yuanshi , dates back to the Cambrian period when major animal groups were first evolving.
Scientists say it is one of the first arthropod ancestors belonging to a diverse group called euarthropoda.
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