INSTRUMENT CLASS*
PLZ HELP ASAP

What is the term for a re-current musical section between various contrasting sections

How did brunelleschi solve his problem with the dome of the florence cathedral? a. he created an outer support shell. b. he created many layers of support within the dome. c. he created external supports for the dome. d. all of the above

Sorry about the calculator and me asap me asap because for real like some no one answers question one for me so that's why i'm posting them over to that way someone can at least answer number two or one for me if you do you so much if you do it would be a complete big blessing to me