What is the difference between the qur'an and the sunnah?

What was different about warfare in the early 1800s and early 1900s?

Which of the following studies is linked most directly to the establishment of the national research act in 1974 and ultimately to the belmont report and federal regulations for human subject protection? a. the public health service tuskegee study of untreated syphilis in the negro male. b. stanford prison experiment (zimbardo).c. tearoom trade study (humphreys).d. the harvard t3 study.

What are the most populous and least areas of russia and why are some areas more heavily populated than others