Viv ; those things are the consequences of the efficacy of the air we breath on our bodies you are confusing metaphor with causal effect.
They are consequences of a great many things, all of which would be a metaphor for what you are talking about.
Yes there are many things we need for us to exist,but stick to the contextwhat's the first thing a human requires at birth? Exactly or no existence.
Atoms. BOOM! Atoms must be the spirit! Well, no, wait. Atoms need electrons and protons and neutrons and the the strong nuclear force. Wait, quarks and bosons are involved in mass and atom formation also....
Your choice is 100% arbitrary. Oxygen is by no means the first thing required for a human to exist, it's one of many components.
That first breath and the force on the lungs is the spirit bywhich we all exist. It's as fundamental as that.
The lungs couldn't draw breath without electrical energy transfer, so really, you could say it's electrons. Your answer is arbitrary and gets us no closer to an answer.