The mathematical system of persective was not used for almost 1,000 years after the fall of rome. when did artist start to use it again?

What is the name of the song released by the artist "owl city" in 2009 as a hit single? (it was also one of the dankest memes of 2017)

Who is responsible for making sure that the sound design plan in us u who is responsible for making sure that the soundesign plan in a theatrical production is feasible?

What is a concern about recovered memories? some recovered memories reveal child abuse. some recovered memories are false. recovered memories people grow emotionally stronger. choices a and b