What is the main reason we group north africa and southwest asia as a region?

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

What factors influenced brazil's current and future economic strength?

Which barrier to economic development is shown in the following examples?