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.

Research on humans tells us that people who are more empathetic tend to be more susceptible to contagious yawning. When you see someone else yawn, the networks in your brain responsible for empathy and social skills are activated. :)

Write a 14 line sonnet about animals.

The lettet ___this morning

What is an author's claim?
A 100% true fact.
A right to something.
Examples and reasons to support research.
A statement that not everyone believes is true.

Which of the following is a run-on sentence?

o We were not sure what we wanted to do, so we decided to see a movie.

o My friend and I'went on a bike ride.

o I wanted to go to the movie he wanted to stay home.

o Although I felt like going on a walk, I was too tired and stayed home instead.

We travel more frequently than them/ they.

Which sentence is correct?
The girl put the book Bugs in My Hair on the shelf.
The girl put the book "Bugs in My Hair" on the shelf.
The girl put the book Bugs in my Hair on the shelf.
The girl put the book "Bugs in my Hair" on the shelf.

What is the relationship between Chiron and other important figures in Greek mythology?

I'm not sure....the house is worth all that money which the following subordinating conjunctions however, so that,ifwever, so that,if​

what is the definition of "valuable economic resource"?

What do you learn about Jack and Algernon from this
passage?
* They value morality over appearances.
They wish to be members of the upper class.
O They are concerned about participating in religious
traditions.
O They will go to great lengths for the women they
love.

Help meee pleaseee.i don’t understand this exercisee

I have to write a essay on a global issue, does anyone have any good ideas? looking for a little more of a specific problem rather then just “pollution or world hunger” as an example haha

(1) Daylight saving is what we call our system of setting clocks one hour ahead so that both sunrise and sunset happen at a later hour. (2) The result of daylight saving is an extra hour of daylight in the evening. (3) He first mentioned the idea of daylight savings, Benjamin Franklin, in an essay he jokingly wrote in 1784. (4) A British builder, William Willett, wrote seriously about the idea in 1907.
(5) Daylight saving has been used in the United States and in many European countries since World War I. (6) The system was begun in order to conserve fuel needed to produce electric power. (7) Since their was an extra hour of daylight in the evenings, homes and businesses didn't have to turn on the lights as early. (8) Some places in the United States went back to standard time, or regular time, after the war, but others kept daylight saving.
(9) During World War II, the U.S. Congress passes a law putting the entire country on "war time," which set clocks one hour ahead of standard time for the rest of the war. (10) The Uniform Time Act that began in 1966 set up a daylight saving time schedule for most of the United States. (11) Each state could vote on whether the hole state would follow daylight saving time.
(12) Under a 1986 law, daylight saving time begins at 2 A.M. on the first Sunday of April and ends at 2 A.M. on the last Sunday of October.

What change should be made in sentence 11?
A.
Change whether to weather.
B.
Change follow to become.
C.
Change hole to whole.
D.
Change would to will.

the answer is

C.
Change hole to whole.

*40 POINTS*
What's the main idea of this article?

PLEASEEEEE HELP ME IM STUCK ON THIS QUESTION

1. Thesis statement: Adults should be required to pass a test before they can become parents.
PRO
CON

3. What does it mean to paraphrase? make up interesting phrases to describe something you read explain all of the main ideas in something you read take notes while looking up unfamiliar words rewrite a short passage in your own words​

What is the plural form for ID?

Identify the figure of speech in following sentence!​

Read the sentence.

Every year, my family goes to Traverse city, Michigan, for a vacation on the lake.

Which edit should be made to correct the sentence?


The word lake should be capitalized.

The word city should be capitalized.

The word Traverse should be lowercase.

The word Michigan should be lowercase

Summary of the ghost by Walter de la mare

feeling bad about it is it a phrase

How does the author's use of short sentences affect the tone of the excerpt? Read the excerpt from "Surrendering" by Ocean Vuong.

After a few days, the poem appeared as gray graphite words. The paper a white flag. I had surrendered, had written.

0 It contributes to a regretful tone.
0 It contributes to a sentimental tone.
0 It contributes to a relieved tone.
0 It contributes to a sarcastic tone.​

Rewrite this edited version of a paragraph written by Daniel Boone just after he crossed the Appalachian Mountains into Kentucky. Look for places where you could add prepositional phrases that would help a reader imagine what Boone saw in this new land. When you are satisfied with your paragraph, submit it to your teacher.

One day I undertook a tour. I climbed. Looking around, I saw the ample plains, the beautiful lands below. I saw the mountains lift their heads and reach. All things were still. I lit a fire, and feasted. I continued this tour, and explored a considerable part. Each day I was as equally pleased as the first. Soon after, I returned home. I determined to bring my family as soon as possible to live here. I thought it was a second paradise.

Here are some prepositions that you can use to create prepositional phrases to add.

on to with in near under
until through of after above over
for from before against across by

Read the following entries.

captive, adj. attentive, intent, fascinated, spellbound
captive, n. prisoner, detainee, hostage

Which word would best replace captive in the sentence below?

Martin was so excited that every time he listened to his favorite author speak, he became captive.
A.
prisoner
B.
detainee
C.
hostage
D.
fascinated

Somebody is going to find out their grade today. Is there a change in voice/subject, number, or mood?

He has lived in Singapore for_____years.​

What is it meant by this phrase: That I was seeing back into time and looking upon the room as it used to be, before she died​

Ram reads a book change into all tenses​

Which sentence is correct?
We watch the TV show "Are you Afraid of the Dark?" every week.
We watch the TV show Are You Afraid of the Dark? every week.
We watch the TV show "Are You Afraid of the Dark?" every week.