Final answer:
The line from the prologue of 'Romeo and Juliet' that reveals the ending is "A pair of star-cross'd lovers take their life", indicating the tragic deaths of the main characters.
Step-by-step explanation:
The line from the prologue of Romeo and Juliet that reveals the ending of the play is "A pair of star-cross'd lovers take their life". This line foreshadows the tragic fate of Romeo and Juliet, indicating that they will both die by the end of the play. The prologue serves as a summary for the entire play and this line, in particular, gives away the culmination of the main conflict: the deaths of the two protagonists caught in the crossfire of their families' feud.
In Shakespeare's plays, especially in his tragedies like Romeo and Juliet, the prologue often sets the stage for the audience, preparing them for the themes and events that will unfold, which includes the fate of the characters.
The play explores complex themes such as love, fate, and the destructive power of hate, culminating in a climax that sees Romeo and Juliet make the ultimate sacrifice due to a series of miscommunications and unfortunate events.