ok, i'll try to be as modest as i can here but i appologise if i sound big headed. i know a hell of a lot about the alien films, i've been a fan for 15 years now and would like to think i know as much as some of the real 'anoraks' out there. one thing that bothers me though is the alien in the third movie. its missing its dorsal pipes on its back. now as i know, the pipes on the back of the aliens are used as a filteration/coolant system to aid the aliens biological survival under the most extreme of conditions. i know this alien in the 3rd film is different in structure but the question i pose is this, how, without those filtering tubes on the back can this alien survive say, in space? or underwater? bugging the hell out of me.