Agraduate student is almost done with his dissertation when he is informed that twenty years ago someone did a very similar project and already demonstrated what he had hoped to be the first to discover. what basic step of the scientific method could have saved him from this problem?

Reviewing the literature

Explanation:

Reviewing the literature could have saved him from this problem as the previous dissertation is present as references for future development or the study of an existing one.

A literature review is a scholarly paper, which includes the new findings with present knowledge, as well as theoretical and methodological development to a particular topic.

i would say b. research typically uses a variety of sources

the answer is solomon northrup. he was a free-born african american, abolitionist and professional violinist that was drugged, kidnapped and sold as slave in 1841 and remained in captivity until 1853 where he regained his freedom with the of the then-governor of new york, washington hunt. he wrote and published his memoirs "twelve years a slave" in 1853, and in this text, he tells the story of his escape thru one of louisiana's swamps (the great pacoudrie swamp) in which he ended up covered in green slime from crossing the surface of the dead water.