The initial flowering of animal life on Earth occurred during the Cambrian, some 540–490 million years ago. Fossil embryos from that time can provide clues about the origins of the major animal groups.
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Budd, G. Lost children of the Cambrian. Nature 427, 205–207 (2004). https://doi.org/10.1038/427205a
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DOI: https://doi.org/10.1038/427205a
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