If zombies are dead, how can they walk? Their bodies shouldn’t function at all. Same goes with mummies they are all old and rotten and I’m pretty sure their muscles have decomposed.

It has to do with there brain being able to fuction by a infection that causes every other part of there body to be dead exept the brain and there primal want is food.the only real way to stop a zombie is to kill the brain.hope that helps:)