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English, 14.05.2021 02:00 fonzocoronado3478

Scientists will continue to investigate the mystery of the yawn. Is it a leftover behavior from before humans had language? Was it a "Hey, I'm sleepy. Let's go to sleep" message? Or is it really just a way to keep our brains cool? While this behavior still is largely a mystery, one thing is certain: you are probably fighting the urge to yawn right about now. Which line shows the main idea of the bolded paragraph? (5 points)

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Scientists will continue to investigate the mystery of the yawn

A leftover behavior from before humans had language

Was it a "Hey, I'm sleepy. Let's go to sleep" message?

You are probably fighting the urge to yawn right about now

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Answers: 2

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