Which are secondary sources? Select three options. documentary about the Great Depression textbook chapter about economic markets book of historical fiction written about Dust Bowl refugees letter home written by someone during the Great Depression Osigned federal law aiding people affected by the Great Depression

answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44

it should be a. song dynasty’s civil service examination system created an administrative bureaucracy manned by the landed aristocracy.

the colonial period, since this was a time of mass immigration from a variety of people from europe.