Watching dukes of hazard

Which filming tool represented one of the biggest advancements in filmmaking? super 8 film format betamax standard cinema verita digital video technology

Which style of polyphony uses a borrowed chant and arranges several new melodies and texts above and unrelated to the chant?

Need some ! asap i need to figure out 3 major changes in bridges over time and why these changes to adapt to both improvements in technology and changing social links would also alot.