Why did scientists want more information about the dinosaur extinctions?
为什么科学家们想要了解更多关于恐龙灭绝的信息？
Worse, the law may actually speed up extinctions.
有时依法反而更糟，可能变相加速动物的灭绝。
If there were no asteroids would there be no extinctions?
如果没有小行星，就不会有灭绝了吗？
And third, there is geological evidence for plant extinctions in the Eocene.
第三，我们已经收集到有关始新世时代植物灭绝的地质证据。
If there were no extinctions of species on Earth, what would life look like now?
设若地球上的所有物种都没有灭绝，今天的芸芸众生会是怎样的？
If there were no extinctions of species on Earth, what would life look like now?
设若地球上的所有物种都没有灭绝，今天的芸芸众生会是怎样的？
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