Title: Serbo-Croatian.
Question: Which additional language was added as an official language after the breakup of Yugoslavia?

Title: Umayyad Caliphate.
Question: Who argued that the Umayyads regarded Islam as a particularly aristocratic faith?

Title: National Archives and Records Administration.
Question: What do the facilities designated to each area of the US specialize in?

Title: Insect.
Question:
What is the collective group to which Thysanura and Pterygota belong?