The bettors is the answer for everything
Texture is the way something feels to the touch, or looks to the eye. Words like rough, silky, shiny and dull help writers describe the texture of an object. An artist shows texture to accomplish the same goal. There are two types of texture: tactile and visual.
The key signature allows the composer to use less accidentals which makes the music less cluttered. Just like the other person who answered this said when a score with multiple instruments is written it is almost always all in the same key to keep the music organized (their answer is better)
Annie Robert i'm almost positive
