That would be a brain cell.
Batteries should be replaced about every 3 to 5 years, some can even last seven. However, it is obvious that if the battery dies (with no ability to "jump"), is corroted, or gets a dead cell in it then it should be replaced.
Use an industrial shredder. They never need to be repaired or replaced and the paper gets recycled.
Neurons in the brain and spinal cord are cells in the body that are never replaced.
A plane flies but never gets hungry.
the brain cells cannot be replaced by the human body, that's why the boxer who gets brain cells damage can never be illed.
hghjgh
Smile, like this :)
Never.
Somepeople thinks so but they will never be replaced.
No he was never replaced.
No,Eminem is alive and never got replaced by anyone.
As the cell gets bigger, the surface to volume ratio gets smaller.