What group of people served as the sturdy base of the frontier

This chart shows the number of soldiers killed according to two different sources. source a is a book written by university professors. source b is from a well-known historical website. in a paragraph, explain why the data presented is different, and evaluate the reliability of each source. which should be used in a school research project, and why?

John lennon and paul mccartney belonged to this group

Toward the end of the roman empire, what caused a decrease in the use of coined money tell me now