Why do researchers obtain information/data from multiple sources?

In one to two paragraphs, compare and contrast the american, french, and mexican revolution.

According to greenville why does great britain have a large debt and who should pay that debt? ?

The indian national congress and the indian national army were the two wings of the freedom movement in india. a. which of these would you have joined? give reasons for your answer. b. why according to you was the indian national army not able to reach where it actually wanted? answer it quickly plsss