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the physiology of the Walkers hasn't been explained as to what keeps them moving/"Alive". Perhaps that keeps all the "meat" from decomposing? It's a show based on a comic book... so who the hell knows.
I think it is ultimately not possible to comport what we observe about zombies with the Laws of Thermodynamics. But we watch
Star Trek and
Star Wars even though they violate Einstein's laws, and
Game of Thrones even though it has dragons, ice walkers, and people being raised from completely dead to be just fine. And let's not even get started on superhero movies.
Such universes exist in imagination. It's fun to play "
what if?" It has been since we were kids. We get enough of real life in real life. Fantasy worlds are fun to imagine from Harry Potter to the zombie apocalypse.