Viv ; those things are the consequences of the efficacy of the air we breath on our bodies you are confusing metaphor with causal effect.
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.
That first breath and the force on the lungs is the spirit bywhich we all exist. It's as fundamental as that.
Toying around with what ifs is distraction for distractions sake.
Do you think the word spirit can be applied in a physical human way if so what would be your description being that the dictionary first definition is a noun