Originally posted by outarddwarf
he didn't neccisarrily evolve beyond the need for oxygen in space. Many things could have caused his stay in space. He could have evolved and made himself into a hulk oxygen tank by creating a pocket in his body that stored extra oxygen before leaving the ship which would be fed into his system to keep him from dying. His lungs could have evolved to become more efficient allowing him to get more oxygen power from less oxygen than usual, which also would allow him to hold his breath for the time needed. It could have been many things that allow that.
Possibly, but he while he was trapped in space, he was fighting n adaptoid that was increasing its strength to match his own. Something like that would surely cause one to run out out of breath soon, but he didn't even notice.
Also, even when one is holding his breath, there's only so much he can do in that state. With no extra oxygen in the vacuum of space, Hulk would have been exhausted, seeing as how he wasn't holding his breath and he was fighting at the same time; he would have run coumpletely out of breath. But he showed no signs of fatigue during his fight, or even when he ws done and returned to the ship.
All in all, the fact remains that his body adapts to whatever is thrown in his direction, be it suffocation, hunger, etc.