They say that he should save the river because he is so big and strong
Dusty could mean for example "This table is quite dusty" if your asking in the literal meaning. As dust could be "There's a ton of dust on that old shelf"
and legally providing cadavers for upcoming anatomists
this is a dependent clause clause because it is not a complete sentence. we know this because it starts at "and"
Credible sources of information for a research paper are a study by researchers published on a university website, a book that gives information in simple language, and a book written by a scholar on the topic.