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550 Million-Year-Old “Lost Years” Fossil Challenges Current Evolutionary Theories

The discovery of the late Ediacaran sponge, Helicolocellus, offers new insights into early sponge evolution, suggesting non-biomineralizing forms existed about 550 million years ago and bridging a critical evolutionary gap between the Ediacaran and Cambrian periods. Prof. Yuan Xunlai and his team

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