Recent studies suggest that we yawn when we get tired as a way to encourage our brains. the theory is that yawning 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.

which line shows the main idea of the bolded paragraph? we yawn when we get tired as a way to encourage our brains
when you yawn, your jaw muscles get stretched
also a deep breath during the yawn forces spinal fluid and blood down
the cool air then cools down these fluids.

How can the rebuttal best address the counterclaim? read the claim and reason beginning in high school students should eam their own money by finding aher school employment. an aber school job seves not only as income, but as valuable experience for when students leave school for the workiorce. read the counterclaim and reason while having a source of income can certainly be a learning experience for high school students, they should maintain their focus on academics and extracurricular activities working atter school many experts agree, can lead to a decrease in school success which can then limit students' options when they enter the workforce the rebuttal should include examples of jobs that are available to students and the problems associated with those jobs the rebuttal should acknowledge that school remains a priority and discuss the benefits of a balance between school and work the rebuttal should address the need for a discussion on the matter by restating both points before reaching a conclusion the rebuttal should state a logical explanation for both opinions before granting credibility to the need for school to remain a priority