how can you tell that Romeo and Juliet is a tragedy based on the plot and character information the prologue contains?

the prologue helps discern the play is a tragedy because:

1 ) it uses the phrase "star crossed lovers" which literally means lovers whose love is agianst the stars. This tells the audience that people and/or situation does not favour these lovers.

2) a tragedy is truly tragic if it doesn't start of as bad. With the introduction of romance followed immediately by the prediction of their death.

3) another element of a true tragedy is reversal of fortunes after the protagonists' demise or downfall. We were informed about the feud between their famillies, which must hav been why they were star crossed lovers, and the fact that the famillies feud was put to an end by their children's death tells us the play is a tragedy.

in ray bradbury's short story "a sound of thunder", mr. eckels's fearfulness leads to drastic consequences for the rest of the world.

in the story, mr. eckels, who is a hunter, hires a time travel company to travel to the age of dinosaurs. although he is excited for the hunting expedition at the beginning, when they reach there and mr. eckels sees the tyrannosaurus, he feels frightened. as he is afraid of the tyrannosaurus, he steps off the path although he has been warned not to do it. by stepping off the path, the entire course of the future is affected: mr. eckart alters the future by stepping on a butterfly, which causes a new man to be elected president in the future. in that way, it is mr. eckart's fearfulness what triggers 'the butterfly effect' and what leads to drastic consequences for the rest of the world.