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Particularly in biological systems we don't actually know until it happens and is well studied. organisms have complex genetics that turns on/off and we cant totally know, but sure some of the above likely but hardly guaranteed. But its sort of a silly hypothetical situation that isnt plausible, much more plausible is climate linked sitution: if all ice caps melted, salinity will naturally decrease but hardly 50%. Humans could also extract salt but it'd take far longer time even if it was essentially free money. As for volume idk how much it would lower sea levels as claimed, seawater is denser & by removing ions the density could revert closer to 1 so volume may not change as we expect.