How do you think the role of rivers and lakes has changed over the course of the nation's history? what are the most important roles of rivers and lakes today?

How does the supremacy clause of the u.s. constitution affect the states? o a. it requires each state to establish a supreme court. b. it declares that the federal government can take away state powers if necessary. o c. it allows state governments to overthrow the federal government if necessary. o d. it ensures that the u.s. constitution overrules each state constitution

The permo-triassic extinction event had a greater impact on the number of earth's species than did the extinction event at the end of the cretaceous true false

The senate differs from the house of representatives in that representatives serve for terms, while senators serve terms. question 18 options: six year, four year four year, six year two year, six year six year, two year