It is a type of animal that helps our eath clean
It's very rare for opossums to have rabies. The only time they can get it is if they're ill and their body temperature rises.
Yes.
if a opposum is hit by a car another opposum is likely to come along and eat it (and possibly get hit by a car) I don't know other natural predators
Possums are not decomposers. They are consumers.