Why does buck not understand the shock of the club?

(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.”)

Read the excerpt from flannery o'connor's "the life you save may be your own although the old woman lived in this desolate spot with only her daughter and she had never seen mr. shiftlet before, she could tell, even from a distance, that he was a tramp and no one to be afraid of. his left coat sleeve was folded up to show there was only half an arm in it and his gaunt figure listed slightly. which phrase connects these characters to the southern gothic genre? half an arm she had never seen his left coat sleeve folded up

According to the article why is salmon is pink