Fossilized embryos of a previously unknown creature have been found in southern China, dating back between 521 million and 541 million years, during the Cambrian period. "We found over 140 spherically shaped fossils, some of which include features that are reminiscent of division-stage embryos, essentially frozen in time," said University of Missouri researcher James Schiffbauer. Scientists found the tiny spheres in limestone of the Hubei province, according to research published in the Journal of Paleontology.

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