Question

co2 (carbon dixonside) is the doorway which let's oxygen" the oxygen advantage

Answer 1

 It’s all about breathing.  Yes, that thing we do automatically, and probably don’t give a lot of thought about, unless of course we can’t.  Would it surprise you to learn that the majority of people don’t really understand how breathing works, or how to breathe properly?  This is such an important topic and book that I’m devoting an entire blog to it.