Ancient spherical fossils dating back to around 500 million years ago appear to be the embryos of a yet-unknown animal. The fossils come from the Cambrian, a time when the diversity of life exploded.
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500-Million-Year-Old Embryos Fossilized in Rare Find
Ancient spherical fossils dating back to around 500 million years ago appear to be the embryos of a yet-unknown animal. The fossils come from the Cambrian, a time when the diversity of life exploded.
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