Terraforming is a slow process as far as I know, and based on pretty much the same things that we have theories about (like using ice comets to seed water etc) but can't do because of our limited techonology. But, despite passing references like mentions about the ancient history of Caldari Prime I don't think there's been many examples of terraforming in the modern day of New Eden. What is pretty much certain though, is that there is no Star Trek like Genesis Devices (i.e. "instant habitable planet, just add protomatter"). So, terraforming lore would certainly be welcome.
As for animals and plants, some have certainly survived the passage of time, like wheat. But I think the description for the Wolf assault frigate says that it has been named after a mythical beast. Then again the Hel mothership description mentions sharks (said to be indigenous to Matar) and hornets. So, some animals seem to exist and others dont. I've seen that roleplayers at least tend to assume for simplicitys sake that many normal animals exist, like panthers, cats, dogs and such - of course, maybe a New Eden cat isn't actually a cat at all, who knows.