It just seems like it would be a really cool thing to have gills and be able to populate the oceans in the same way we populate the land. We could have houses and shops and vehicles, andgo on walks/swims and just kind of live underwater.
Start a whole new second species of human here on earth maybe, Who knows?
Changing the color of your eye take so much changes that’s impossible todo it, gills is going to need so much changes, and we don’t even know what most of our genes do