1 Multiple sclerosis (MS) is a disease that causes demyelination (disruption of the myelin that insulates and protects nerve cells) of spinal nerve and brain cells.  Although the exact case is unknown, multiple sclerosis is considered to be an autoimmune disease.
The skunk is not a rodent. They belong to the family Mephitidae and the order Carnivora which does not include rodentia. They are sometimes placed in the family Mustelidae (weasels) but have been discovered to be less related than was thought.
Difference between Rat and Rodent Tweet Key Difference: A rat is a medium-sized to large rodent, with a pointed muzzle, long slender and hairless tail, and dexterous forepaws. Rodents are mammals that are part of the Rodentia order under the Mammalia class. The terms rat and rodent are often confusing for many people as there are many similarities between a rat and a rodent. This is because Rats are actually rodents. Rodents are mammals that belong the Rodentia order, which rats are part of. Hence, it be very confusing. However, one should keep in mind that although all rats are rodents, not all rodents are rats. The Rodentia order has over 2,277 species. A rat is a medium-sized to large rodents, generally described as pigeon-sized.