Are you seriously talking about the real zombie apocalypse, or are you kidding? If you are suddenly, by accident, serious, then I have very good news for you: zombies do not exist at all. Therefore, no zombie apocalypse can occur in principle, and as a result, no one in the world can have the slightest idea of what exactly might happen in a real zombie apocalypse. How can you reason about the properties of that which does not exist and cannot exist?would even be an issue in a real apocalypse situation