Rheumatoid arthritis (RA) is an autoimmune disease that causes chronic inflammation of the joints. Autoimmune diseases are illnesses that occur when the body's tissues are mistakenly attacked by their own immune system.
What role did the bison or buffalo play in the culture of the Plains Indians? The bison were an important source of fur, food, and shelter for the Plains Indians. They used every part of the animals they killed. Bison were also an important part of their culture.
Bison are the largest land mammals in North America and Europe. There are two species, or types, of bison: the American bison and the European bison. The animal commonly called the American buffalo is actually the American bison. It is also called the plains bison.