there are both physical and spiritual representations, observable of the metaphysical universe -
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transforming from one being into another is proof of both, the physiology without its spiritual content will dissolve into the atmosphere and the spiritual content that shapes its physiological presence. both are not native to planet Earth.
it would seem the evolutionary path would be for the spiritual to have a physical presence that could more readily transform to less cumbersome properties and the rules for that somehow involve being positive and not negative. from the heavens.