为了进化，最好让生物灭绝。
It is better for the sake of evolution to allow creatures to go extinct.
现代生物灭绝的主要原因是人类活动影响的结果。
The main reason of modern organisms extinct is the effect by human activities.
从化石记录中可以了解到一些已经灭绝、但已经完全变成海洋生物的鲸目动物。
Extinct but already fully marine cetaceans are known from the fossil record.
在大规模灭绝之前，高等海洋肉食生物是远古的鲨鱼。
Before the mass extinction, the top ocean predators were primitive sharks.
这些生物怎么活过大灭绝的不得而知。
What makes those creatures survive the extinction event is a mystery.
人类出现之前，生物进化的过程中就伴随着物种的灭绝。
Before the existence of human, the process of biological evolution is accompanied with species extinction.
森林让濒临灭绝的生物存活下去。
但是在恐龙灭绝之前，另一件事件引起了大规模的生物进化。
But well before all that happened, another event triggered a different burst of evolutionary activity.
如果稀有生物都灭绝了，我们的生活将会变得怎样？
If rare animals were extinct, how our life would be influenced?
如果稀有生物都灭绝了，我们的生活将会变得怎样？
If rare animals were extinct, how our life would be influenced?
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