The columbian exchange was the transfer of a. plants, animals and disease c. plants, clothing and religious customs b. water, plants and social customs d. all of the above

there are two main types of historical sources: primary sources and secondary sources. a primary source is something that originates from the past. it can be a chronicle, a piece of pottery, or even a piece of glacial ice that gives us climate data about the levels of atmospheric carbon one thousand years ago.

racism and segregation.