Board Thread:Off Topic/@comment-26397825-20160113034906/@comment-26463535-20160116235838

@AC

No, they shouldn't. The lungs and gills would share the same passageways. If Marinia is underwater, than the gills open and the passageways close to the air lungs, allowing water to divert through them. If Marinia is on land, than the gills close and the passageway to the air lungs opens, allowing air through. The bloodways would also have such valves for when the person is under or over water and change the bloodstream accordingly.