Is this a model of an element, a compound, or a mixture? Explain your reasoning.

What was the midwest states often called because they were located in the center of the nation

During the 1500s,most rulers supported established a. political systems. d. none of the above b. churches c. freedom of speech

Before they can be published, scientific papers must be peer-reviewed. this means that: a) some other scientific experts read the papers and guarantee that they are true.b) some other scientific experts read the papers and provide quality control by eliminating many mistakes.c) an editor reads the papers, to make sure that all the semicolons are in the correct places.d) everyone in the world is given the opportunity to comment on the papers through a specially maintainedblog.e) government bureaucrats read the papers, to be sure that the papers do not insult the political positions ofthe current officeholders.