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A student from the Department of Geology observes a fossil from the Qingjiang biota through a microscope in Northwest University in Xi'an, capital of northwest China's Shaanxi Province, April 8, 2019. (Xinhua/Liu Xiao)
A student from the Department of Geology observes a fossil from the Qingjiang biota through a microscope in Northwest University in Xi'an, capital of northwest China's Shaanxi Province, April 8, 2019. (Xinhua/Liu Xiao)