Which of the following describes a major theme that affected the period of 600 to 1500?
a. the decrease of local trade and the expansion of continental trade. bthe increase of trade within regional borders only
c. the increase and spread of trade across continents.
dthe decrease of trade as the result of world conflict

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explanation:

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