https://www.researchgate.net/publication/263703355_Management_challenges_of_Didymosphenia_geminata
Theory can be changed based on new research but law is backed up with immense info and is has not been broken once
Different soil, location can be a factor, the amount of sun, wild and domesticated can vary
The molecules doesn't need energy to cross through.
The diffusion doesn't need protien, the molecules pass between phospholipids by passes protien. It moves smaller molecules. Facilitated need protien also hormone, and larger molecules.
I wish it makes sense.