What problems do you think would develop from a system which divided people into socioeconomic groups (rich, middle class, poor, etc.) and did not allow people to advance from a lower class to a higher class? Be as detailed as possible with the types of problems.

Drastic boundary changes can occur for all of the following reasons except for a. a shift in the way a river flows b. the collapse of a government system c. a conflict between two neighboring groups d. one country's decision to sell land to another country select the best answer from the choices provide

Where did the solar system come from?

Why do so many children develop illnesses in southern africa? a. poor nutrition due to poverty c. very bad air pollution b. climate many diseases thrive d. declining life expectancy