Why are rain forest so important?

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

Lines of longitude are like stripes from the top of the globe down to the bottom virtually slicing the earth like an orange

Why is immigration so important today?