Why are frescoes affected by moisture

They are affected by moisture - ones needs to keep them dry with the humidity at an ideal constant level.

but for art history, they arent affected because the paint dries with the plaster on the wall, effectively making the fresco part of the wall

the answer is b. false. a fugue is a traditional form of a composition in where a part would enter after the other and uses the same theme. the music would then grow constantly in size as well as in intensity.