Which is a secondary source about the civil war? 1. gettysburg address 2. movie about gettysburg 3. union soldiers' personal letters  i think its 3.

In other words which one of the four perspectives do you believe best explains why people do the things they do in our society? which one of the four perspectives best explains why you believe the things you do, and why you act the way that you do?

The prefix of the italicized word in the sentence is rather difficult

(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.”)