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Ivan
3 years ago
14

(1) Fire extended humans’ geographical boundaries by allowing them to travel into regions that were previously too cold to explo

re. (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.”)
English
1 answer:
Andreas93 [3]3 years ago
7 0

(3) Fire, in fact, has been a significant factor in human development and progress in many ways.

This is the main idea. The rest of the sentences support the idea that fire has helped human development and progress. It says that it has allowed humans to "travel into regions that were previously too cold" and "to sleep securely". The passage then continues to talk about how when humans learned to control fire it made significant changes in how long people were able to be productive since they no longer had to rely on the sun for light.

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