Once consciousness had emerged, the capacity for more complex behaviors created an arms race between competing species.

意识出现后，更复杂行为的能力在竞争物种之间引发了军备竞赛。

Perhaps the catastrophe began with a climate change or with the invasion of competing species from the continent.

灾难也许是随着气候的变化而开始或是因为大陆过来的竞争物种。

Once consciousness had emerged, the capacity for more complex behaviours created an arms race between competing species.

一旦意识出现，更复杂行为的能力就会在竞争物种之间引发军备竞赛。