Which Netherlandish artist is known to have created more than 70 self-portraits?

Umberto Boccioni's Unique Forms of Continuity in Space (fig. 25.4) is a __________

A. sculpture B. painting C. collage D. drawing E. mixed media

The two most significant innovations in building design introduced by the Romans were the __________, which made construction of the Pantheon possible

a. arch and concrete b. dome and the vault c. amphitheater and the colosseum d. aqueduct and the arch e. dome and the basilica