(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.
Answer:
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THE DANCING YOUTHFUL MEXICAN
You should use the definition or explanation clues in understanding the meaning of the word or phrases that are unfamiliar. This kind of context clue lets you explain about or give the explanation of the word or phrases right after it is used.