Yes but what I’m saying is, to life forms from other planets that breathe other gases, us humans breathing oxygen will seem as weird as what they breathe might seem to us. To us on earth, it’s perfectly normal and not odd, because it’s what we are used to.
We use oxygen to oxidise stuff for energy. Nothing odd about that, practically all Earth life does that and has since the oxygenation crisis
Yes but what I’m saying is, to life forms from other planets that breathe other gases, us humans breathing oxygen will seem as weird as what they breathe might seem to us. To us on earth, it’s perfectly normal and not odd, because it’s what we are used to.