The tuskegee syphilis study was ethically problematic because participants were not allowed to seek available treatment penicillin was not administered to the men’s wives only black men were invited to participate the study was continued for approximately 40 years

participants were not allowed to seek available treatment

Explanation:

Tuskegee Syphilis Study was known as "Tuskegee Study of Untreated Syphilis in the Negro Male." The study started in 1932. The purpose of the study was to record the natural history of syphilis.

The problem with this treatment was that the researchers first did not inform the participants on whom they were performing the research about the purpose of this study. Second, researchers did not allow these participants to seek available treatment for syphilis i.e., drug penicillin.

So, the correct answer is the first option.

answer; i believe that the correct answer is (scientific approach)

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.