dinosaurs' high level of fitness could also explain why mammals remained so small until the mass extinction of the dinosaurs 65 million years ago.
恐龙的高度适应性可能也解释了为什么哺乳动物的体型总是那么小,这种情况一直持续到六千五百万年前恐龙大规模灭绝。
now the closest look yet at events 252 million years ago is linking those eruptions even more closely not only to the biotic cataclysm in the sea but also to the mass extinction on land.
目前对这个2.52亿年前发生的大事件的深入研究表明,这次爆发不但导致了海底生物的灭绝,连陆地上的生物亦难免于难。
the action must also have played an important role in the mass extinction during the late permian and early triassic.
研究二叠纪末一三叠纪初生物大绝灭事件具有重要作用;
now research suggests the mass extinction happened at or just after the biggest phase of the deccan eruptions, which spewed 80 percent of the lava found at the deccan traps.
现在的研究显示,大灭绝刚发生在deccan喷发的最大阶段或稍后,发现其中喷出80 %的熔巖在deccan凹陷。
few people need convincing that the destruction of rain forests, the mass extinction of species and the melting of the ice sheets in greenland would all be very bad things.
大多数的人都相信,热带雨林的破坏、物种的大量灭绝以及格陵兰冰层的融化全部都将是非常糟糕的事情。
the mass extinction is the greatest environmental threat that human is facing.
物种大灭绝和不可恢复性是人类面临的最大环境威胁。
the results show that the mass extinction coefficient of the hollow particles increases to a great extent when contrasted with that of the solid ones unde.
结果表明,空心复合微粒相对于同外径的实心粒子,质量消光系数有较大提高。
the mass extinction of terrestrial dinosaurs is the most important evolutionary event across the cretaceous-paleogene boundary.
陆生恐龙的绝灭是白垩系-古近系界线事件中最引人注目的。
one such lacuna has been the absence of well-preserved feathers from the cretaceous—the period between 145m and 65m years ago that ended with the mass extinction that wiped out the dinosaurs.
其中之一便是一直杳无蹤迹的来自白垩纪时期的保存良好的的羽毛化石。白垩纪处于一亿四千五百万年前到六千五百万年前之间,以恐龙的大规模灭绝为结束标志。
research scientists have shown the meteorite hit the earth about 30 million years earlier than the mass extinction of dinosaurs.
科学家们的研究表明,这颗陨石撞上地球的时间要比恐龙大规模灭绝的时间早大约30万年。
fossil evidence suggests that small and medium sized animals were more likely to survive the mass extinction than larger species.
化石证据显示,中小型动物比较大型物种更有可能在大灭绝中幸存下来。