Title: Antenna (radio).
Question: What term can be used to refer to the usable spectrum of an antennas frequency?

Title: Umayyad Caliphate.
Question: Where was the capital before Ali changed it?

Title: Age of Enlightenment.
Question: A variety of movements such as liberalism and neoclassicism's intellectual heritage can be traced back to what period of time?

Title: Insect.
Question:
Who introduced the Latin term for insect, borrowing from the Greek vernacular?