In bud not buddy why did bud get on the train

What is the main purpose of a speech bubble in a graphic novel ?

Write about a scientist and present information including a short biography, contribution,their scientific achievements and contribution to science

Alittle later than his thisbe had, and he could see what surely were the tracks of a wild beast left clearly on deep dust. his face grew ashen. and when he had found the bloodstained shawl, he cried: "now this same night will see two lovers lose their lives: she was the one more worthy of long life: it's i who bear the guilt for this. which statement best describes how the order of events creates tension?