How did andrew carnegie make his fortune? a. he produced steel very efficiently. b. he established electricity companies all over the world. c. he set up telegraph offices in the united states and europe. d. he established a network of radio companies.

after the roman empire, the catholic church began to unify by taking on many duties of a government.

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