Which format was used for movies of the 1910s and 1920s?

Generally speaking the format was of black and white and silent format. However by the last quarter of the 1920´s decade sound was introduced giving way to the concept of "musical"

it should be a. song dynasty’s civil service examination system created an administrative bureaucracy manned by the landed aristocracy.

the correct answer is d

a conference committee is a group of congress representatives appointed by the senate and the house to reach an agreement over a bill that had different versions in each chamber. this is due to the fact that, to pass a law. both the house and the senate must agree on the exact same content and wording of the bill to present it to the president.