. ——— is a systemic auto-immune disorder.
A. A sprain
B. Gout
C. Rheumatoid arthritis
D. Osteomyelitis

It was said to have happened by earthquakes, the shifts in the tectonic plates moved everything 

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on

Your answer is going to be a. i know my biology