As scientists have studied the evolution of BSE, they note that it is very similar to a disease that affects sheep. It has also been shown to be similar to a disease that affects rodents. Humans have been infected with a variation as well. What is the MOST reasonable conclusion that can be made from these studies?
A. Every species is exposed to the disease in different ways.
B. The disease can mutate and infect different species.
C. Animals like cattle can be considered a “dead end host.”
D. Scientists are confusing separate diseases as just one disease.
