Is a Gb to Ab a whole step or a half step?

Which of the following is not a basilica-plan structures a. old saint peters b. sant’apollinare nuovo c. santa costanza d. santa sabina

2+2+2+2+2++2+2+2+2+22+2+2+2+22+2+2+2+22+2+2+2+22+2+2+2+22+2+2+2+22+2+2+2+2=

Ancient music was produced by what types of cultures? a. literate b. modern c. large d. all of the above