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B. A treaty banning nuclear tests.

for sure is B

B

Explanation:

a treaty banner nuclear test

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

a drastic rise in oil prices ended decades of postwar.