In a study to identify risk factors for multiple sclerosis (ms), researchers use hospital records to identify 25 people with ms and 25 people without ms then interview them about childhood exposures to pesticides and other chemicals. what type of study is this?

Which of the following statements best describes relations between india and pakistan? a. the countries have had peaceful relations since the partition of india. b. the countries have an ongoing trade dispute with bangladesh. c. the countries have had conflicts over the region of kashmir. d. the countries have agreed not to develop nuclear weapons.

How much rainfall does the choco region of colombia receive each year a. less the 40 inches b. between 100 and 500 inches c. between 200 and 250 inches d. more then 400 inches

In which country is a system of unlimited government practiced? a) sweden b) north korea c) united states d) united kingdom