【摘 要】
：
在地球生物圈的历史中,与主要改造时期有关的是大规模的生物灭绝,在短时间内(数千或数万年)很多曾繁荣过的动物和植物群体消失了,最著明的灭绝事件发生在大约6 500万年前的中
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在地球生物圈的历史中,与主要改造时期有关的是大规模的生物灭绝,在短时间内(数千或数万年)很多曾繁荣过的动物和植物群体消失了,最著明的灭绝事件发生在大约6 500万年前的中生代和新生代交接期。恐龙类就是那时消失的。但更严重的危机发生在2·5亿年前,在古生代二叠纪和中生代
In the history of the Earth’s biosphere, associated with the period of major remodeling, large-scale extinctions, many of the most prosperous animals and plant communities have disappeared in a short period of time (thousands or tens of thousands of years), the most obvious extinction Occurred during the Mesozoic and Cenozoic transitions, some 65 million years ago. Dinosaurs disappeared then. But the more serious crisis occurred 250 million years ago in the Paleozoic Permian and Mesozoic
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