if your gerbil chews its cage bars, then eventually it will wear away the hair on the top of its nose.
if its in a pair maybe the other one has hurt it or it might have fleas/mights.
No it cant
you should really take it to the vet. i don't think it is a good idea to put the injured gerbil back in the cage though.
the fatter the gerbil, the thicker the bedding.
Of coarse it can.
It is called a gerbilarium.
Syrian Hamsters will kill and eat a gerbil, do not put them together in the same cage.
Get a screen and put it in the middle of the tank/cage.
No, never do this. Hamsters are solitary, and it may attack the gerbil.
Because she is scared or excited and wants to tell another gerbil. Or she is calling for a male gerbil to mate with.
Take it out of the cage ASAP and bury it in a box.
any kind!
No. It is perfectly normal. This means that your gerbil needs some time to get used to his/her cage. Don't take it out for an hour or so after putting it in.