When did the caste system evolve into a four tiered hierarchy? A. when the Aryans ruled over the region
B. when the Arabs ruled over the region
C. when the Mongols ruled over the region
D. when the Gupta Empire ruled over the region

Who was marshall mcluhan and what did he have to do with communication theory?

One day as your professor is driving to work, another driver runs through a red light and hits his car. the professor is shaken up but survives the accident. however, the next time he starts to enter the intersection, he becomes nervous and fearful. soon, he starts going to work via another route to avoid the intersection even though this route adds twenty minutes to his commute in each direction. according to the principles of classical conditioning, why does the professor become scared of the previously harmless intersection? what can he do about this, as going via other route is very time consuming? be specific. break down the situation into its parts and show how the principles of learning apply.

How does smith characterize the colonizing effort and why does he so characterize the effort to settle jamestown?