"Probably. Magic still works even in other planes, unless it's a dead magic plane. And this place, which is outside Pharasma's Creation, still permits us to cast. Likely, arcane magic would work in Ev, provided you managed to figure it out somehow, someday.
It's...a little bit of both. I'm not sure, myself. I don't think it has anything to do with our bodies, though. Many nonhumans are able to cast arcane magic in our world. Though I suppose that doesn't negate the hypothesis that it has something to do with...the environment we were exposed in while we were young as a prerequisite for casting, or something like that.
Don't feel too bad. Even if I could have taught you, my price would probably be too much for you to afford. I'm a ninth-circle wizard – thousands of novice wizards and even experienced wizards would kill their parents and their grandparents for a chance to apprentice under me." He sounds very proud and haughty about it.