地球历史上的生物大灭绝

比较地球历史上五次主要的大灭绝事件（奥陶纪末、晚泥盆世、二叠纪末、三叠纪末和白垩纪—古近纪），说明各次事件可能的主要致死机制（冰川作用、海洋缺氧、巨型火山喷发、小行星撞击），并解释为什么大灭绝虽然是灾难性的，却也为后续的演化辐射腾出了生态空间。

Compare the five major mass extinction events in Earth history (End-Ordovician, Late Devonian, End-Permian, End-Triassic, K-Pg), describe proposed kill mechanisms for each (glaciation, oceanic anoxia, volcanic mega-eruptions, asteroid impact), and explain why mass extinctions, while catastrophic, also open ecological space for subsequent evolutionary radiations

学习证据 / Evidence

• 能按时间顺序说出地球历史上五次大灭绝的名称，并给出大致时间。
• 能将二叠纪末大灭绝描述为最严重的一次，并将其与西伯利亚暗色岩火山喷发及其对大气的影响联系起来。
• 能解释每次大灭绝之后都会发生一次适应辐射：例如白垩纪—古近纪大灭绝清除了非鸟类恐龙，使哺乳动物得以多样化，并最终演化出人类。

• Names all five major mass extinctions in chronological order with approximate dates
• Describes the End-Permian extinction as the most severe and links it to the Siberian Traps volcanic eruption and its atmospheric consequences
• Explains how each mass extinction was followed by an adaptive radiation — e.g. the K-Pg extinction removing non-avian dinosaurs allowed mammals to diversify and eventually produce humans

评估问题 / Assessment

{{name}}能否解释，导致恐龙灭绝的小行星撞击实际上对应地球历史上的第五次大灭绝——并且描述最严重的那次大灭绝发生了什么，那次大灭绝杀死了超过90%的物种？

Can {{name}} explain that the asteroid that wiped out the dinosaurs was actually the fifth mass extinction in Earth history — and describe what happened in the worst one, which killed over 90% of all species?