system
Given the following post, respond as if you're commenting on Reddit:
human
[Zombies in general] Why is it that in so many zombie films, we often see reanimated zombies with bites or missing a limb? Shouldn't so many zombies be literally just a head or perhaps too much of the person's body has been consumed so they don't reanimate at all?

If it may take say 10 or 20 mins to be reanimated, i gotta figure one zombie would be tearing through a good chunk of a body and several zombies would leave a body to mere bits and pieces.
gpt
zombies are paradoxical. 

As you said zombies tear appart their victims. This would prevent the person from becoming a zombie because there would not be enough left of him/her to reanimate.

Another problem with zombies is that they are 1. strong enough to overrun the world and defeat the armed forces but at the same time 2. can be taken out by the dozens by untrained survivors.

If zombies are so weak untrained starving survivors can take them down then they would have never taken over or spread that far. If they are strong enough to defeat the army then the survivors would stand no change at all as the zombie number increased.

 

I have found an answer to both problems. This would require the zombie making disease to be airborne in order to infect everyone. Then the disease turns everyone into zombies except a small group of people who happen to be immune. This way you can have your zombie horde while the survivors still stand a change. It would also explain the amount of "intact" zombies. They were not killed by other zombies but simple turned by the disease.