Why do certain species go extinct?
为何存在某一种类灭绝？
Will human being go extinct one day?
人类会有灭绝的一天吗？
Will it make a difference... if these species go extinct?
如果这些物种灭绝······会有什么差别呢？
Because dinosaurs are extinct the scientists had very little to go on.
因为恐龙已经灭绝，科学家几乎无法研究。
Because dinosaurs are extinct the scientists had very little to go on.
因为恐龙已经灭绝，科学家几乎无法研究。
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