I believe spiritual nature is responsible for creation of physical nature because of the paradox. Physical nature cannot create itself.
the intermediary, physiology could be responsible for both ...
Physiology is the scientific study of normal mechanisms, and their interactions, which works within a living system. - cr: Wikipedia
Physical things cannot create themselves. Repeat that to yourself a few times if you need to. It is a paradoxical argument that a physical thing can create itself because it would logically have to first exist in order to create itself. If it exists already, it's not creating itself because it already exists. I don't really know how to dumb that down any more for you, if you want to mindlessly argue that it could do this or that, it's up to you... it can't do anything until it exists. That's just basic logic.
If a spiritual entity imbibes itself into something physical, by definition, it becomes something physical. And I've never said birth is the creation of a new spirit.
If a spiritual entity imbibes itself into something physical, by definition, it becomes something physical.
I'm not sure why they would not both retain their own unique quality when absorbed into eachother - the spirit turning itself into its own physical shape would make more sense. as what I would expect the spirit to be capable of when necessary.
By definition, if something is physical, it is not spiritual. Likewise, if something is spiritual, it is not physical. Can something physical have spirituality? Sure! But it is, by definition, something physical. We are physical creatures who have spirituality. You can argue that we are spirits who have physiology but having physiology makes us physical beings.