Why are the secondary chords secondary.. -topic is. piano chords
-please give a real answer.
-dont take from google (ive already tried)
-only answer IF YOU KNOW MUSIC.

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

Suppose that you are in a room with 3 doors and a crack in the ceiling for light. that is all. the doors each have a sign on them that says what there is behind them. door #1. a pool of corrosive acid. door #2. a crocodile that hasn't eaten in 8 months. door #3. a solar "oven". a giant lens that focuses all the sunlight at the entrance of the door. you must choose a door, which door do you choose?

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.