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)

Group of answer choices

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

Scientists dedicate their lives of knowledge, but even with the lifetime commitment, or sometimes scientists fail to find the answers. 1 mystery that still remains unsolved is why we yawn, what makes us yawn or what purpose this serves. Recent studies gives that the yawn when we get tired as the way to encourage our brains.

What is main idea?

Main idea is the most important and the central idea of the passage.

Because the passage talks about how the science have given humans many amazing devices or useful bits of the knowledge.

Learn more about Main idea here https://brainly.com/question/13024528

#SPJ2