Can you help me? Please

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

Suggest two reasons why irrigation is important for human development of the desert

Based on what you know about the location of the earth in relation to the sun, why is this called the goldilocks zone in other galaxies?