In the country of Rudanda, it is very hard for a person born within a particular strata of society to move to a different strata. This means that Rudanda has a low degree of:

answer; i had to look this up and the only one i found was(last only 15 minutes) plz check first and good luck;

well, there are a lot of places we get information about earth from. like science classes, websites, books, newspapers, etc.