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The humble seed spreads life across the planet.
不起眼的种子在地球散播生命，
And each tree and plant pumps out even more oxygen.
这些树与植物释放出更多氧。
It's an environment very much like today.
这种环境与今天非常相像。
The planet has come a long way,
我们有长足的进步，
from a lump of burning rock and dust,
从一团燃烧的岩石灰尘，
to a blue and green world bursting with life.
到生机盎然的蓝绿色行星，
There are now fish, plants, and this, the dragonfly.
这里有鱼，有植物，还有这个，这是蜻蜓。
It's called Meganeura.
这种庞然大物叫做巨蜻蜓。
This insect is the size of an eagle.
跟老鹰一样大的蜻蜓，
What were once legs have evolved into wings,
曾经的腿已经进化成翅膀，
extending the dragonfly's hunting territory over a vast area.
大幅扩展蜻蜓的狩猎范围
There are also millipedes, and spiders down there.
这里还有马陆、蜘蛛。
These creatures, called arthropods, were among the first to set foot on land hundreds of millions of years ago.
这些节肢动物率先踏上陆地，他们已经存在数亿年，
They look almost identical to the bugs that invade our homes today.
他们看起来几乎就像现在入侵我们宅院的虫子。
