What had to happen in panama before the canal could be built? a french contractors had to be hired. b a cure for malaria had to be discovered. c the us army had to be sent to panama. d panama had to gain independence from colombia.

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