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.

Westridge, ohio — more than 600 transportation employees went on strike at midnight last night after the westridge city council rejected their demand for a 10% pay increase. the strike affects all bus and rail services throughout westridge and the neighboring communities of turlock, smithfield, and lowell grove. "we hoped we would not be forced to strike, but until our demands are met, we really have no choice," said wanda thompson, a representative of the transportation employees union. "we simply don't get paid what we deserve." members of the westridge city council see the situation differently. "our employees already earn 6% more than the state average for similar transportation jobs," said raoul cobian, president of the westridge city council. hopefully the two groups can come to an agreement soon and bring this unnecessary strike to an end. what is the common name for the underlined information in the article?