Early vehicle emission control devices held back the _?_ to reduce emissions by altering the operation of the advance devices on the distributors. A. oxidizing catalyst
B. air injection pulse
C. ignition timing
D. None of the above.

Which group of barbarian invaders at one time controlled part of italy and formed a kingdom in southern france, and were forced into spain by the franks?

How does the character of the fourth movement compare with the first three? consider such factors as tempo, texture, rhythmic character, and melodic themes.

Which statement is true? select one: a. all art created in florence during the renaissance was commissioned by the medici family. b. without wealthy patrons, it is likely that many italian renaissance works would not have been created. c. religion was the driving force behind works created by leonardo and michelangelo. d. the public was responsible for determining whether an artwork was great.