What was Brain focused on getting at the end of chapter 17?

Write a one-paragraph friendly letter in the box below. the letter will be sent to ashley cooper at 225 east maplewood drive in texarcana, arkansas. the zip code is 30990. be sure to format the letter appropriately

According to the article, affects the perception of color. culture winning gender daylight

(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.”)