Hey people please help me answer this ASAP
Brainliest and 50 points!

(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.”)

“skateboarding is a sport combining grace, courage and skill, and here we see it being born.” based on this passage, what inference can you make about the author’s opinion of skateboarding? a. the author does not think skateboarding is a ‘real’ sport. c. the author feels skateboarding should be illegal. b. the author feels skateboarding is only appealing to very young children. d. the author respects and appreciates skateboarding as a sport.

How can you avoid the problem of groupthink? a. by choosing a group leader to direct the group b. by composing the team of only like-minded individuals c. by encouraging all members to voice their opinions d. by keeping quiet when you disagree with another group member's opinion