The United States is a federal republic, which divides power among national, state, and local governments, but it is also a representative democracy, which means that

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

Some fossils provide evidence to suggest that earth's climate has changed over time. which information can scientists obtain from these fossils? check all that apply

Based on the information in the graph, what can you conclude about humans in the world in general?