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.
Genus: Bison. Species: bison. This animal's true name is the American bison, but most people call them buffalo. They are the largest terrestrial animal in North America. Bison once dominated the grassland and prairie ecosystems of the United States. When the first explorers came to the Great Plains, it is estimated that over 40 million bison roamed the land. By 1900, a little over 1,000 bison could be found with only a handful of wild bison left in Yellowstone National Park.