What's the word that means "an extra one in case it breaks"

Nthis excerpt from act v of shakespeare's romeo and juliet, friar laurence's letter to romeo is not delivered due to circumstances beyond his control. what is the conflict in the scene?

Which statement best provides an objective summary of "annamaria's integration? "

Which statement is not true about run-on sentences? a. a run-on sentence has more than one clause. b. one way to correct a run-on sentence is to add a joining word c. one way to correct a run-on sentence is to add an appropriate punctuation mark. d. a run-on sentence has only one clause.