Charlemagne restored order in the old roman empire by

a. establishing a central government over western europe.

b. practicing christianity.

c. maintaining a strong military force.

Which institution includes radio televisions and movies

What are objects called that have value in and of themselves as well as value as a means of exchange? custom commodity money currency simple money

Donald is studying the eating habits of all students attending his school. he samples the population by dividing the students into groups by grade level and randomly selecting a proportionate number of students from each group. he then collects data from the sample. which type of sampling is used? select the correct answer below: systematic sampling convenience sampling stratified sampling cluster sampling