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Based on the article provided, here are three key points regarding the fossil discovery in China:
Challenging the "Cambrian Explosion" Timeline: The discovery of over 700 fossils in Yunnan province dating back 554 million years suggests that complex animal life began earlier than previously thought. This implies that the "Cambrian Explosion" was likely a "slow burn" with clear foundations in the preceding Ediacaran period, rather than a sudden, spontaneous burst of diversity.
Presence of Advanced Biological Traits: The fossils include bilaterians (animals with bilateral symmetry) and deuterostomes (a major group including vertebrates). These creatures already possessed "modern" features like mouths, guts, and pharynxes, indicating that complex body modules had already evolved by the late Ediacaran.
Evidence of Diverse Lifestyles and Forms: The Jiangchuan biota reveals a variety of specialized organisms, including cambroernids with coiled bodies, tube-like creatures resembling ventilation pipes, and sausage-shaped worms capable of movement. This variety shows that life was already "exploring" different body plans and ecological roles well before the Cambrian period began.
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