央视从3亿美元砍到6000万美元

Chinese-led team uncovers oldest known body fossils of ringed worms_蜘蛛资讯网

ut display clear segmentation along their bodies, a defining characteristic of annelids. Each body segment bears paired appendages, or parapodia, which in modern relatives are used for movement and re

ologies and that annelids may have had an evolutionary history prior to the Cambrian explosion.The discovery not only fills a gap in the earliest evolutionary history of annelids but also suggests tha

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