What sign in a musical notation is used to cancel a sharp or flat sign

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

In 1401 a competition to create a set of bronze doors for the baptistery of florence cathedral was held, and this competition is often credited with the beginning of renaissance art t or f?

Euphronios and phidias were artistis who lived in ancient