地球在2.52亿年前曾发生过一次最大规模的灭绝事件,地球上的生命几乎消失殆尽。但科学家们近日发现了生存在灭绝事件过后1000万年时期的恐龙祖先化石。科学家在坦桑尼亚、赞比亚和南极洲进行了7次考察,发现了一些最早的前恐龙生物的化石。这些化石或许可以告诉我们,草食性生物是如何最终演化成为恐龙,又是如何在2.52亿年前的大灭绝事 One of the largest extinctions ever occurred on Earth 2.52 billion years ago, life on Earth has almost disappeared. But scientists have recently discovered dinosaur ancestral fossils that lived 10 million years after the extinction. Scientists conducted seven missions in Tanzania, Zambia and Antarctica and discovered some of the earliest fossils of pre-dinosaur creatures. These fossils may tell us how herbivore eventually evolved into a dinosaur and how it was extinct by 252 million years ago