no if you feed them it, they have 99% of dieing
Not if a guinea-pig eats it, as you have put in the question. It's okay if a guinea-pig chews a piece of fabric, because it will grind their teeth down, which is a good thing.
You can feed them both guinea pig food. Don't feed the guinea pig the rabbit food or it will be sick. Rabbits are ok on guinea pig food.
No it isn't ok. Guinea PIg food is made for Guinea Pigs. Your Cavy will get sick if they do eat hamser food.
Yes, tomatoes are great for guinea pigs.
yes its ok to give your pig grains but try not to give it too many.
Yes
It depends. They certainly wont be aggresive, but if you do, make sure to spay and nueter them.
guinea pigs dont fart, they have no way to remove air from their bodies.
If the guinea pig is just roaming around the house without protection, then probably. if it's in a locked cage, then it should be ok. a little scared, but ok.
a guinea pig and a mouse aren't the same the guinea pig must have its own type of food like alphalpha pelets and hamsters should eat seeds,nuts,etc. Seeds and nuts are like poison to a guinea pig if the guinea pig and mouse are just eating alphalpha pelets (not seeds) i would say its ok.
nibbles the guinea pig is cooler than you but not as cool as me and she is not C.O.O.L as in constipated-overweight-old-lady. ok i guess she is a bit overweight.
its not the best idea coz guinea pigs like getting used to their habitat, and they hate being in cars U nit wit the official hand book says that it is OK