If a historian wanted to study data based on trends of a culture relationship to earth's physical features which kind of expert should she consult

Which physical feature minimizes population density in northern africa?

Do you think the cartoonist has a positive or negative view of bryan? why?

What two different approaches did the knights of labor and the american federation of labor take in building a union organization? a) the knights of labor accepted only unskilled workers; the american federation of labor accepted only skilled workers. b) the knights of labor accepted skilled and unskilled workers; the american federation of labor accepted only skilled workers.c) the knights of labor refused to accept african american or chinese workers; the american federation of labor accepted all workers.d) the knights of labor accepted workers from a single industry; the american federation of labor accepted workers from several industries.