Why were participants of the Tuskegee Syphilis Study chosen to participate?

Which statement best describes standard oil in the late 1800s? standard oil controlled only a small number of the nation’s oil refineries. standard oil was a single business that operated in a small region. standard oil controlled only the means and methods of oil production. standard oil owned ninety percent of all oil refineries in the united states.

What is a characteristic of hunter-gatherer societies?

How does the existence of a site like catus hill demonstrate the challenge that archaeologist face when making theories?