romeo and juliet act 3 scene 1

At the beginning of the scene ( act 3 scene 1) why does benvolio think that there will be a fight ? Capulets are around and its really hot to hot to be calm
what does tybalt call romeo ? a villian
why wont romeo fight tybalt ? their related now
who fights for romeo reputation ? mercutio
why does mercutio curse both capulet and montague houses because he was stabbed and hes dying
what does romeo say that juliet beauty has done to him made him weak
why does romeo change his mind and fight tybalt ? he killed mercutio and wanted revenge
who tells the prince about the deaths of mercutio and tybalt benvolio
what was the princes judgement for romeo ? why ? banned him from verona because tybalt would have been killed anyway