Quote:
Originally Posted by Flyndaran
Europans though... I'm really skeptical of altering the human genome to something capable of surviving as a "cold-blooded" non-Earth seawater breathing fish form. But at least it doesn't break any laws of physics that I know of.
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Gills for anybody anywhere are pretty dubious. It goes back to the turbo-pumps for liquid fuel rockets in a way.
Air carries 30x as much oxygen as water can so a set of gills for a human-like being have to move 30x as much water as lungs for them would move air. Cut that in half for "cold-blooded" and it's still a question of "How?" and "Why aren't they using if for propulsion too?".
Like the turbopumps there may be an "extreme" answer but that extremeness might be pretty obvious such as "gills" that are larger than the organism they supply