Our ancestors way back in time could breathe underwater, so it would be going backwards if we became able to again. Also, evolution works by favouring changes that make a species more likely to survive and produce lots of healthy children. Being able to breathe underwater would be awesome, that’s for sure, but I’m not sure it would make us more likely to survive and have children. We could be mauled by a shark for one thing. And our mobile phones would stop working.
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