Which of these best describes an opportunity cost? a win-win
a loss
a chanco
a trade-off

Arrange the events in chinese history in chronological order using the numbers 1-4. the ming dynasty falls to the qing. china experiences a 400-year period of peace known as the pax sinica during the han dynasty. a golden age of expansion and culture occurs during the tang dynasty. nationalists and communists fight a civil war for control of china.

Which of the following highlight the literary significance of elie wiesel's speech? select all that apply. it uses rhetorical devices to persuade with pathos. it assigns meaning to the existentialist nature of life. it won the nobel prize for literature. it attempts to put into words the unspeakable horror.

(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.”)