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If something has survived,
如果有什么活下来，
then life may be found where it was last seen, in the oceans.
它最有可能是在上次见到生命的地方，也就是海里。
Now, 540 million years ago,
5亿4000万年前，
in an ocean full of oxygen,
在富含氧的海洋里，
those primitive bacteria have evolved.
这些原始细菌已经演化。
A handful must have clung on through the big freeze.
肯定有少数细菌熬过大冰封。
There are plants scattered on the sea floor.
到处都是植物，
And something else.
还有别的。
What looks like an armored slug takes up residence.
这看起来像身披盔甲的蛞蝓
It's called Wiwaxia, a new generation of complex multi-celled organisms.
叫做微瓦霞虫，是新一代的复杂多细胞体。
The Earth enters one of the most dynamic periods in its history,
我们进入地球史上最具活力的时期之一，
the Cambrian explosion.
即寒武纪大爆发。
Increased oxygen levels allow creatures to grow larger and develop bony skeletons.
氧浓度升高使得生物长得更大，并且长出硬骨骨骼。
There are worms, sponges, and these trilobites:
有虫，有海绵，还有这些，
distant relatives of insects, lobsters, even scorpions.
他们是三叶虫，是昆虫、龙虾甚至还有蝎子。
Life in the oceans blossoms.
海洋生机盎然，
From microscopic bacteria, to monsters.
从微小的细菌到这样的庞然大物，无所不包。
This is Anomalocaris.
这是奇虾，
Nearly two feet long,
身长约60公分，
it has large eyes, razor sharp teeth and grasping limbs.
瞧瞧它的大眼、锐利的牙齿还有能抓住物体的肢体。
