By the end of the first century BCE, the Romans had perfected which architectural innovation?

Which of these is true about Gregorian chant?

a. For hundreds of years it was only sung by priests and monks. b. Until 1963 it was only sung in Latin c. Most of the movement of its melody is to adjacent pitches d. It does not have metrical rhythm e. All of these choices

For The Continuing Presence of the Past: Joseph Beuys’s Untitled I: Beuys’s work pushes the boundaries of what might be considered art. How does the vitrine itself help to put his work into an artistic context?

What will be an ideal response?