The allowed new ideas to flow more easily to distant places during the renaissance.
a. aerial screw
b. optical telescope
c. printing press
d. heliocentric model

C. printing press. The heliocentric model was Nicolaus Copernicus, and the theory that the sun was the center of the solar system. The optical telescope used lenses and all that stuff to look at the stars, and the Aerial screw was a theory of Da Vinci's for flight.

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