Can someone answer these question asap .

Which was an effect of the establishment of the european union

Which of the following starements is true based on the above information?

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?