Yes earth had life and a lot of it without oxygen, but it wasnt until life developed in an oxygen enviroment that it exploded to what it is now, so it very well could be that life can only explode under an oxygen enviroment. Heh, I would say the news is more interested in who Tiger is screwing or who Paris flashed or who said what to who on american idle. Problem is twilight, vegetation does not thrive in those conditions. We have evidence for this on earth, in the canadian north vegetation drops off the furthur north you go, and cold isnt the only reason, its lack of sunlight... then again 'permanent twilight' is something else altogether, always being there could somewhat compensate for the weakness. Yes actually it is that bad, remember these are permanent conditions that never change, the sun side of the planet will be baked dry, think the Sahara Desert, and even the Sahara gets a chance to cool down every 24 hours and life is barely holding on by a thread. Cold side is even worse, life really hates the cold as we know from antarctica. That of course is land, water is another story, and another problem, if by chance this planet has a lot of water like earth, because its always facing the sun and one side is super hot you are going to have a hell of a lot of evaporation, if the planet is always under a heavy cloud cover then you will get runaway global warming, the oceans will get totally evaporated and you just end up with another Venus.