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If something has survived,
如果有什么活下來(lái)，
then life may be found where it was last seen, in the oceans.
它最有可能是在上次見(jiàn)到生命的地方，也就是海里。
Now, 540 million years ago,
5億4000萬(wàn)年前，
in an ocean full of oxygen,
在富含氧的海洋里，
those primitive bacteria have evolved.
這些原始細(xì)菌已經(jīng)演化。
A handful must have clung on through the big freeze.
肯定有少數(shù)細(xì)菌熬過(guò)大冰封。
There are plants scattered on the sea floor.
到處都是植物，
And something else.
還有別的。
What looks like an armored slug takes up residence.
這看起來(lái)像身披盔甲的蛞蝓
It's called Wiwaxia, a new generation of complex multi-celled organisms.
叫做微瓦霞蟲(chóng)，是新一代的復(fù)雜多細(xì)胞體。
The Earth enters one of the most dynamic periods in its history,
我們進(jìn)入地球史上最具活力的時(shí)期之一，
the Cambrian explosion.
即寒武紀(jì)大爆發(fā)。
Increased oxygen levels allow creatures to grow larger and develop bony skeletons.
氧濃度升高使得生物長(zhǎng)得更大，并且長(zhǎng)出硬骨骨骼。
There are worms, sponges, and these trilobites:
有蟲(chóng)，有海綿，還有這些，
distant relatives of insects, lobsters, even scorpions.
他們是三葉蟲(chóng)，是昆蟲(chóng)、龍蝦甚至還有蝎子。
Life in the oceans blossoms.
海洋生機(jī)盎然，
From microscopic bacteria, to monsters.
從微小的細(xì)菌到這樣的龐然大物，無(wú)所不包。
This is Anomalocaris.
這是奇蝦，
Nearly two feet long,
身長(zhǎng)約60公分，
it has large eyes, razor sharp teeth and grasping limbs.
瞧瞧它的大眼、銳利的牙齒還有能抓住物體的肢體。
