What can lines help create in a drawing

When the percussion section played the theme, the theme was less recognizable since most percussion instruments aren't tuned to a pitch the instrument sounds included drums and cymbals both a and b neither a nor b

Match the instrument with its classification group: trumpet idiophone piano chordophone cowbell membranophone snare drum aerophone

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?