No and they are defined as "fake" in manga terms.
If you take that fake sharingan out, it'll begin to to disintegrate while the eye will regenerate back on the Edo Zombie.
Some of them died and had lost their eyes so I'd say no. (Sasuke had Itachi's eyes)
This ^
No but if the host died with the eyes,they will have them when revived and so will anyone taking them after death.so sharingans can be mutipled by transplanting them,killing the victims and repeating.