SOS i need help on my English homework

Writers try to let us know what is central to their writing. when we notice words such as "meanwhile," "afterward," "before," or "previously," an author is letting us know the order in which events happen. a paragraph that mostly uses these key words is arranged in what structural form?

(1) fire extended humans’ geographical boundaries by allowing them to travel into regions that were previously too cold to explore. (2) it also kept predators away, allowing early humans to sleep securely. (3) fire, in fact, has been a significant factor in human development and progress in many ways. (4) other obvious benefits of fire are its uses in cooking and in hunting. (5) probably even more important, however, is that learning to control fire allowed people to change the very rhythm of their lives. (6) before fire, the human daily cycle coincided with the rising and setting of the sun. (7) with fire, though, humans gained time to think and talk about the day’s events and to prepare strategies for coping with tomorrow. the sentence that expresses the main idea is: (type the number of the sentence. then click “go.”)

In 3 sentences explain how ambrose bierce's use of foreshadowing or flashback influences "an occurence at owl creek bridge "