Why does the amount of water that flows in a river change during the year

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

The largest internal organ in the frog is the

In the diagram below, ab and bc are tangent to o. what is the measure of