They do not eat it, simply.
They can, and they do.
It muffles (stops) the sound because the string stops moving.
Only if it happens to be a 2 foot long piece of string.
Yes
Absolutely not.
The tighter you make the string - the higher the pitch.
Nothing, as it won't go anywhere. Only a taut string can transfer vibrations
It either is tightened or loosened
the note becomes lower
it will moe faster
This will depend upon the length of the string and what it is made out of. A simple piece of cotton string or thread, less than a few inches in length, will probably pass through the rabbit's digestive tract without incident. A long piece of string, such as one 6" or longer, may cause a string foreign body in the intestines - this is a medical emergency that will require surgery to correct and remove the string. Also, a piece of string made of nylon or plastic is more likely to cause an impaction in the stomach or intestines and need to be surgically removed.