Title: Gothic architecture.
Question: How long had Italy undergone building in a Classical architecture style at the time of Vasari?

Title: Anti-aircraft warfare.
Question: Targets could be how many feet for the HAA to engage them?

Title: Matter.
Question: What planet isn't a closed system but sometimes appears to be because of the approximate conservation of matter?

Title: Beyonce.
Question:
What is the parent company of the music service Beyonce owns part of?