The Constitution specifies that the presiding officer of the Senate is the vice president; however, the __________ presides in the vice president's absence

Under __________ federalism, the national government has tight control of states through orders or mandates, often without accompanying financial resources

Answer:

During the last 500 years, ______ has led to approximately 150 million deaths.

a. war b. contagious disease c. flooding d. climate change