I've never heard of Primeval, so I'm not sure! But for Terra Nova, the basic idea is that humans have destroyed the earth, so they have to go somewhere else (I'm still unclear on if it's a different planet or a different part of Earth, but I THINK it's a different planet), and that place has a different history than earth - nothing happened there to cause the extinction of the dinosaurs. It's also mostly untouched by humans, and the point of moving there is as sort of a fresh start with all of the mistakes we've made here, heh -_- (and they're also super picky about who they let cross over!)
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Date: 2011-10-03 09:49 pm (UTC)