Worms with Kneecaps

Fossil evidence from China reveals that complex multicelled organisms appeared suddenly without simpler evolutionary predecessors. The fact that these ancient creatures are nearly identical to modern groups suggests a history of stability rather than gradual change.

Image: Chengjiang biota collage, Dwergenpaartje Cédric Aria, Fangchen Zhao, Han Zeng, Jin Guo, Maoyan ZhuSmith, Degan ShuYujing Li, Mark Williams, Thomas H. P. Harvey, Fan Wei, Yang Zhao, Jin Guo, Sarah Gabbott, Tom Fletcher, Xianguang Hou, Peiyun Cong, CC BY-SA 4.0, Wikimedia Commons.

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