How did the people of Rome protect themselves after the fall of the Roman Empire???

Which of the following statements accurately describe the importance of the american concept of government and democracy? (select all that apply.)

Mr. mann's science students were experimenting with speed. they set up a 1 meter (100 cm) track. the students used balls instead of cars. the balls were different sizes and made of different materials. four at a time, students rolled balls around the track to see which had the fastest and slowest speeds. some of their data are shown in the table. which ball will take the longest to complete one lap around the track?

How is government in the united states like that of ancient athens?