Which source would best a historian understand how the great chicago fire affected families? a) a biography of a chicago family displaced by the fire b) a letter from a grandmother in new york to her family in chicago c) a newspaper editorial about families who were displaced d) an oral history dictated by an adolescent who fled the fire

a.   it resulted in widespread unemployment.

aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on