But evolution ended up giving us two external tubes to breathe. My conclusion is that its better to have redundancy in external tubes openings for air.
So, to avoid the efficiency of a branch that lets us eat and breathe from our mouths would you make it so we can’t breathe from our mouths and we still have 2 tubes to breathe as redundancy? If so, where would you place the extra tube opening? Head or further away? Toe or back would help act as a snorkel, I’d think.