In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
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Question: Why did the Ottonian dynasty get replaced by the Salian dynasty?, Context: During the early High Middle Ages, Germany was ruled by the Ottonian dynasty, which struggled to control the powerful dukes ruling over territorial duchies tracing back to the Migration period. In 1024, they were replaced by the Salian dynasty, who famously clashed with the papacy under Emperor Henry IV (r. 1084–1105) over church appointments as part of the Investiture Controversy. His successors continued to struggle against the papacy as well as the German nobility. A period of instability followed the death of Emperor Henry V (r. 1111–25), who died without heirs, until Frederick I Barbarossa (r. 1155–90) took the imperial throne. Although he ruled effectively, the basic problems remained, and his successors continued to struggle into the 13th century. Barbarossa's grandson Frederick II (r. 1220–1250), who was also heir to the throne of Sicily through his mother, clashed repeatedly with the papacy. His court was famous for its scholars and he was often accused of heresy. He and his successors faced many difficulties, including the invasion of the Mongols into Europe in the mid-13th century. Mongols first shattered the Kievan Rus' principalities and then invaded Eastern Europe in 1241, 1259, and 1287.

Answer: struggled to control the powerful dukes ruling over territorial duchies


Question: what has the better chloroplasts, Context: The alga Cyanophora, a glaucophyte, is thought to be one of the first organisms to contain a chloroplast. The glaucophyte chloroplast group is the smallest of the three primary chloroplast lineages, being found in only 13 species, and is thought to be the one that branched off the earliest. Glaucophytes have chloroplasts that retain a peptidoglycan wall between their double membranes, like their cyanobacterial parent. For this reason, glaucophyte chloroplasts are also known as muroplasts. Glaucophyte chloroplasts also contain concentric unstacked thylakoids, which surround a carboxysome - an icosahedral structure that glaucophyte chloroplasts and cyanobacteria keep their carbon fixation enzyme rubisco in. The starch that they synthesize collects outside the chloroplast. Like cyanobacteria, glaucophyte chloroplast thylakoids are studded with light collecting structures called phycobilisomes. For these reasons, glaucophyte chloroplasts are considered a primitive intermediate between cyanobacteria and the more evolved chloroplasts in red algae and plants.

Answer: red algae


Question: Which happened earlier, the University of Chicago reached the Sweet Sixteen or the university chose to withdraw from the conference?, Context: The Maroons compete in the NCAA's Division III as members of the University Athletic Association (UAA). The university was a founding member of the Big Ten Conference and participated in the NCAA Division I Men's Basketball and Football and was a regular participant in the Men's Basketball tournament. In 1935, the University of Chicago reached the Sweet Sixteen. In 1935, Chicago Maroons football player Jay Berwanger became the first winner of the Heisman Trophy. However, the university chose to withdraw from the conference in 1946 after University President Robert Maynard Hutchins de-emphasized varsity athletics in 1939 and dropped football. (In 1969, Chicago reinstated football as a Division III team, resuming playing its home games at the new Stagg Field.)

Answer:
the University of Chicago reached the Sweet Sixteen