During the last quarter of the 19th century large numbers of immigrants were admitted to the united states primarily because of the economy need for more A. Skilled craftsmen
B. educated professionals
C. Unskilled factory workers
D. Scientists and technicians

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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