Question

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Science has given humans many amazing devices and useful bits of knowledge. We know so much about our bodies and how to stay healthy, for example. We also know how to make machines and devices that make life easy for us. Scientists dedicate their lives to knowledge, but even with a lifetime commitment, sometimes scientists fail to find all the answers. One mystery that still remains unsolved is why we yawn—what makes us yawn and what purpose it serves. Recent studies suggest that we yawn when we get tired as a way to encourage our brains. The theory is that yawning helps cool the brain, allowing it to work more efficiently. According to WebMD's article about these studies, when you yawn, your jaw muscles get stretched, increasing blood flow to your neck, face, and head. Also a deep breath during the yawn forces spinal fluid and blood down from the brain. The cool air then cools down these fluids. Other scientists believe, however, that yawning is a form of communication. This theory attempts to explain why yawning seems to spread from person to person. This kind of behavior is called "contagious yawning" and carries with it a possible social message. Scientists are not yet sure what exactly the message is, but they believe people who have more social empathy are more likely to start yawning when they see someone else yawning. 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 from the text shows why scientists continue to study yawning?
One thing is certain: you are probably fighting the urge to yawn right about now.
Other scientists believe, however, that yawning is a form of communication.
One mystery that still remains unsolved is why we yawn—what makes us yawn and what purpose it serves.
The theory is that yawning helps cool the brain, allowing it to work more efficiently.

Answer 1

Yes yawning helps in cooling the brain in form of resting the whole body

Answer 2

Step-by-step explanation:

Is it a leftover behavior from before humans had language: When we think, most of us have the feeling that words flow through our minds. If you stop to “listen” to your own thoughts, though, you will be amazed by how jumbled and chaotic they are. Our inner voice is something of an inner mumbler, creating a stream of disconnected words and phrases, rather than crystal-clear speech.

It is easy to imagine that we think in whatever language we speak – whether English, Spanish or Mandarian. But this is entirely wrong: language can express some of the results of our thinking, but it’s not the thinking itself.

Was it a "Hey, I'm sleepy. Let's go to sleep" message?:A. Scientists will continue to investigate the mystery of the yawn

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.