The Rio Grande, Sabine, and Red River are examples of - A. latitude lines that create national borders
B. rivers that are polluted by religious rituals
C. physical features that create political borders
D. physical features that are currently the source of a violent conflict

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.

the russian revolution of 1917 involved the collapse of an empire under tsar nicholas ii and the rise of marxian socialism under lenin and his bolsheviks.