I'm currently writing on my FTL (Secret of Life) and I'm looking for a gas which could replace oxygen in an alien organism.
For this specific race I've already thought up a homeworld with more landmass than earth, but far higher sea levels. This resulst in a world with 85% watermass, looking a bit like a whole-world indonesia (archipelagos, yay!).
So, what I'll need now is any gas which could be used for respiration and still allows this world to occur.
PS: I do want them not to use gills, mainly because they still are a land-walking species. They have better water adaption than humans already have, but they shouldn't be fish altogether.
For this specific race I've already thought up a homeworld with more landmass than earth, but far higher sea levels. This resulst in a world with 85% watermass, looking a bit like a whole-world indonesia (archipelagos, yay!).
So, what I'll need now is any gas which could be used for respiration and still allows this world to occur.
PS: I do want them not to use gills, mainly because they still are a land-walking species. They have better water adaption than humans already have, but they shouldn't be fish altogether.