Target practice is one common use. They can also be used in animal testing, probably the 2nd most common use. A third use would be as a food source, though that is not highly recommended. They could also be used as disease vectors, and though this is a theme in some popular Horror movies, I do not know that it has ever happened in reality.
I think there are more rats in the world than humans.
They eat rats,humans,and Spiders
the rats eat meat as humans do
They dont. Any interraction is purely coincidental. Rats hate humans. They only like rats. Get some real friends man....
Yes, rats are almost everywhere that humans have went to.
YES
maybe
The Gallbladder. :)
Yes. They are social animals that thrive on interractions with both rats and humans.
the causes of the plague was the fleas on the rats they bit the rats and then when the rats died they moved on to bite the humans
Rats, humans, beavers.
The plague was carried by rats, who were infested by fleas. As the rats succumbed to the plague, the starving fleas fed on humans infecting them with the plague.