destrekor
Lifer
- Nov 18, 2005
- 28,799
- 359
- 126
I'm not a biologist, but I'm not sure that's true. A little quick googling tells me that it takes 40-50 years for bones to become brittle. And we find caveman bones intact.
I might be wrong on the bones becoming brittle early enough, but there are still two factors to consider:
1. We don't find every single skeleton. Most are not preserved, what we find is rare. Natural elements often destroy almost or the all of the entire body, but sometimes a few bones are preserved or, even more rarely, an entire set of bones.
Same reason we only have found, comparatively, a handful of dinosaurs.
The "cavemen" we find, and other early hominids, aren't truly fossils just yet, but in the environment in which they are found, give them a few million years and they'd become rock fossils. They're the specimens that have found the right soil and variables to become preserved enough to last the ages.
We don't find every animal that just dies randomly in the woods or anything.
Why don't we find the woods scattered with bones? Animals have to die somewhere. Now, bones of the very young and very old are more porous and likely not to be discovered after time, so that's one factor.
But another factor to consider for zombies: they are still walking around, but the flesh is actively in a state of decay. A virus or something is still animating the body through the nerves, but bacteria and whatnot are still consuming the body. Bones, after time, would settle into the earth after this type of decay, and would be picked clean by all the other life, so certain types of soil can help preserve and stop any continued bone loss. Hanging out in the open environment, pro-bone soil environments cannot do anything to stave off destruction.
But that leads to the final point for zombies: bone still contains living tissue, the marrow, and it is likely the zombie bug infects the marrow. Without animals to pick some of the marrow clean, this is an infected element within the bone, so now there is decomposing tissue outside and inside the bone.
Lastly... it's fiction. So, there's that.
