What is the form of each variation in twinkle twinkle little star?

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?

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

Order these space notes in the bass clef from highest space to the lowest space