What can be difficult for people at bedtime?
falling asleep
moving a picture
talking to a parent
taking a warm bath

Answers

Answer 1
falling asleep maybe
Answer 2
It is most likely falling asleep it’s the most relevant answer to the question

Related Questions

I'll give brainliest! What is the meaning of this quote in you're opinion?
“A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing.” — George Bernhard Shaw.

Answers

Answer:

It means making mistakes in life is useful.

Explanation:

Because if we never make mistakes we will never learn from them and it shows we have honour and nobility because we are learning from them and not repeating these and even better if we learn from others' mistakes.

can someone please help me with this ​

Answers

Answer:

Is it possible to easily end homelsessness in America? Homelessness is an economic problem. Homelessness lack access to health care and often have chronic illnesses, made worse by tough living conditions. sleeping outside in all weather, eating cheap starchy foods, and being in close quarters at social service agencies with other unhealthy people. Homelessness also causes negative effects like loss of self-esteem,  Becoming institutionalized, Increase in substance misuse. There are so many problems and we would be furthermore in-depth  So no it's not easily possible to end homelessness in America.

Explanation:

Please give brainly if this helped.

this is correct i just did it

I'm writing a book.
I can't decide the name of the lead character.
Luna or eurus

Answers

Answer:

Luna sounds like a good name, what's the story about?

Explanation:

whoever u r i prefer curus

Which sentence should be revised to eliminate repetition??

Answers

Answer:

the first one

Explanation:

because it is meaningless

Answer: C

Explanation:

Each excerpt can be rearranged and placed as it would be in a complete essay. The excerpt given as the third choice is repetitive of the first choice in the fact that it talks about limiting an internet users search results. The first excerpt is seen as coming after the last excerpt and flows quite a lot better than the last and the third. Happy learning! : )

What part of speech is the word in CAPS?

Brian walked SLOWLY home, as the day was so warm and pleasant.

Noun
Verb
Adverb
Adjective

Answers

The word “slowly” is an Adjective
The word slowly is an adverb. Not adjective.

In the spaces to the left of each number write P for phrase, IC for independent clause, and DC for dependent clause.
______ 1. Under extreme pressure

______ 2. To turn to the right

______ 3. Knitting is difficult

______ 4. Who the best candidate will be

______ 5. In time of extreme danger

______6 Listen

______ 7. When I heard

______ 8. Until you told me

______ 9. I was chosen

______ 10. Whom he addressed

______ 11. Seen in the park

______ 12. Walk carefully

______ 13. Angered by that remark

______ 14. Before the exam

______ 15. Before he left

______ 16. On the floor were my books

______ 17. Jump

______ 18. Since swimming in the lake

______ 19. Riding home in the car

______ 20. Besides jogging

______ 21. After the dinner party

______ 22. Each answered

______ 23. Driving home

______ 24. Reading helps

______ 25. Giving him a lift

______ 26. Speak clearly

______ 27. Since few arrived

______ 28. No one saw

______ 29. Jumping is exhausting.

______ 30. Besides doing your work

______ 31. Until we leave

______ 32. That fell

______ 33. Where it fell

______ 34. Before crossing the street

______ 35. While we waited

______ 36. Have a great time

______ 37. Which is yours

______ 38. No one cared

______ 39. Left for dead

______ 40. Because they went​

Answers

Answer:

1. P

2. P

3. IC

4. DC

5. P

6. IC

7. DC

8. DC

9. IC

10. DC

11. DC

12. IC

13. P

14. P

15. DC

16. IC

17. IC

18. P

19. DC

20. P

21. P

22. DC

23. P

24. DC

25. P

26. IC

27. DC

28. IC

29. IC

30. DC

31. P

32. IC

33. DC

34. DC

35. DC

36. IC

37. IC

38. DC

39. DC

40. DC

(The dude who wrote this was correct. I checked it on paper. I hope this helps you.)

Answers of the following are

___P___ Under extreme pressure

____P__ To turn to the right

___IC___ Knitting is difficult

__DC____  Who the best candidate will be

____P__ In time of extreme danger

____IC__ Listen

___DC___ When I heard

____DC__  Until you told me

__IC____ I was chosen

___DC___ Whom he addressed

___DC___ Seen in the park

____IC__  Walk carefully

___P___ Angered by that remark

___P___  Before the exam

__DC____  Before he left

__IC____ On the floor were my books

___IC___  Jump

___P___ Since swimming in the lake

__DC___  Riding home in the car

____P__  Besides jogging

____P__  After the dinner party

___DC___ Each answered

___P___  Driving home

___DC___  Reading helps

__P____  Giving him a lift

__IC____  Speak clearly

___DC___ Since few arrived

___IC___  No one saw

____IC__  Jumping is exhausting.

___DC___ Besides doing your work

___P___ Until we leave

___IC___ That fell

___DC___ Where it fell

___DC___  Before crossing the street

___DC___ While we waited

___IC___  Have a great time

___IC___ Which is yours

___DC___  No one cared

__DC____ Left for dead

___DC___ Because they went

What are Independent Clause?

An Independent Clause also known as Main Clause that can stand by itself as a simple sentence. Independent Clause contains a subject and a predicate and makes sense by itself. A semicolon or a comma followed by a coordinating conjunction can be used to align independent clauses.

What are Dependent Clause?

Dependent clause lacks a complete notion, a dependent clause, also known as a subordinate clause, is a clause that cannot stand alone as a complete sentence. Dependent Clause has a subject and verb.

To learn more about Dependent Clause And Independent Clause here

https://brainly.com/question/1332399

#SPJ2

WILL GIVE BRAINLIEST IF RIGHT
Nights and Dragons— From the memoir of author Abigail Prynne I could have given up, but I thought about my grandmother. She always told me that "people who believe that science is the answer to everything are missing out on everything else." With her words in mind, I searched some more. There were many facts that hinted that dragons may not be fictional. I noticed that cultures across the world all described dragons in similar ways. This was odd because they had no way to communicate with each other. I found dragons mentioned in more than just stories. They appeared in old legal papers, in the travel logs of Marco Polo, and in the Bible. I saw that the Chinese calendar uses a different animal each year. Dragons are included along with eleven real animals. I began to believe it was a real possibility that all of these people were talking about a creature that actually existed. The text discusses the Chinese calendar by writing, "Dragons are included along with eleven real animals." What does that imply?
(A. Dragons are the only fake animal on the Chinese calendar.
(B. Dragons are not the only fake animal on the Chinese calendar.
(C. Dragons are real because all the other animals on the calendar are fake.
(D. Dragons are real because all the other animals on the calendar are real.

Answers

Answer:

Well i guess dragons are the only fake animal on the Chinese calendar because we only mostly heard about dragon's in paper and other then that

SORRY IF IS WRONG I JUST TRIED MY BEST, HAVE A GREAT DAY :)
d- dragons are real Bc all other animals on the calendar are real.

true or false: An epic work is a story or poem that focuses on heroic characters that act out grand struggles.

Answers

Answer:

I think the answer is False

Explanation:

Sorry if it is not:-(

Answer:
True

Reasoning:
It is true because epic means a long narrative poem about a larger-than-life hero

Suzanne is an archaeologist working on the uncovered site of an old Viking community what kind of education would Suzanne have needed to work on this site?

an associate degree in math
an apprenticeship with a blacksmith
a masters degree in anthropology
an internship with the local construction firm

Answers

Answer:

A master's degree in Anthropology

Explanation:

Suzanne is working on a Old Viking Community. To understand the vikings, Suzanne should have a masters degree in Anthropology. Anthropology is the scientific study of humanity, concerned with human behavior, human biology, cultures and societies, in both the present and past, including past human species. They consider the past, through archaeology, to see how human groups lived hundreds or thousands of years ago and what was important to them. To work in the uncovered site of an old Viking community, she needs a master's degree in Anthropology.

a masters degree in anthropology, C

This speech was given prior to the Civil War and nearly 70 years before women in the United States were allowed to vote. What is Sojourner Truth saying about the connection between civil rights for African Americans and the rights of women? Why was she able to stand before a large audience and expound this way without notes or preparation? What issue of today might inspire you to make an unrehearsed speech? Post a detailed response to the Sojourner Truth Discussion prompt. Then respond to two classmates' posts.


I cant link the speech but you will be able to find it online i believe, please help me out im rlly struggling







HELPPPP

Answers

Sojourner was fighting for people’s rights and wanted to stand of for all African americans

Write a story that takes place on another planet. Underline (or all caps) the adjectives you use to describe the setting.

Answers

Answer:

It was Alex's first day on planet RX after the emergancy evacuation. It was a quite UNUSAL planet and much different from Earth. Planet RX had a BRIGHT PINK sky that was FILLED with BLUE, FLUFFY clouds with HUGE dog-like animals flying through the air. The air had a SWEET smell to it, every time Alex inhaled it reminded her of candy and cake. The ground was very SMOOTH and it was SOFT like a pillow, it was also a very DARK RED color almost like blood. The weather on planet RX was very HOT and SUNNY; going out without any sunscreen or protection from the sun would usually lead to very PAINFUL burns and rashes all over the body. Alex had lots to learn about planet RX and she had to do it QUICKLY.  

Explanation:

E.t came to earth and touch a boys finger then rode his bike across the moon ( et summed up)

The word _____ below could be replaced with the synonym "twisted", in the sentence without changing its meaning.

TWO roads diverged in a yellow wood,
And sorry I could not travel both
And be one traveler, long I stood
And looked down one as far as I could
To where it bent in the undergrowth;


diverged
bent
undergrowth

Answers

The answer is bent i took the test and got it right
the answer would be bent because it has the same meaning as twisted

which phrase is the most negative connotation: a garnish style, a bold style, or a gaudy style

Answers

Answer:

a bold style

Explanation:

because it makes you speak well

Answer:

The most negative connotation is a bold style. I'm not 100% sure but I got this exact same question on my test and I answered, 'A bold style'.

Explanation:

It helps you speak better and be better.

Memories of a Memory

Have you ever witnessed something amazing, shocking or surprising and found when describing the event that your story seems to change the more you tell it? Have you ever experienced a time when you couldn't really describe something you saw in a way that others could understand? If so, you may understand why some experts think eyewitness testimony is unreliable as evidence in scientific inquiries and trials. New insights into human memory suggest human memories are really a mixture of many non-factual things.

First, memory is vague. Imagine your room at home or a classroom you see every day. Most likely, you could describe the room very generally. You could name the color of the walls, the floors, the decorations. But the image you describe will never be as specific or detailed as if you were looking at the actual room. Memory tends to save a blurry image of what we have seen rather than specific details. So when a witness tries to identify someone, her brain may recall that the person was tall, but not be able to say how tall when faced with several tall people. There are lots of different kinds of "tall."

Second, memory uses general knowledge to fill in gaps. Our brains reconstruct events and scenes when we remember something. To do this, our brains use other memories and other stories when there are gaps. For example, one day at a library you go to quite frequently, you witness an argument between a library patron and one of the librarians. Later, when telling a friend about the event, your brain may remember a familiar librarian behind the desk rather than the actual participant simply because it is recreating a familiar scene. In effect, your brain is combining memories to help you tell the story.

Third, your memory changes over time. It also changes the more you retell the story. Documented cases have shown eyewitnesses adding detail to testimony that could not have been known at the time of the event. Research has also shown that the more a witness's account is told, the less accurate it is. You may have noticed this yourself. The next time you are retelling a story, notice what you add, or what your brain wants to add, to the account. You may also notice that you drop certain details from previous tellings of the story.

With individual memories all jumbled up with each other, it is hard to believe we ever know anything to be true. Did you really break your mother's favorite vase when you were three? Was that really your father throwing rocks into the river with you when you were seven? The human brain may be quite remarkable indeed. When it comes to memory, however, we may want to start carrying video cameras if we want to record the true picture.

Which line from the text best explains why the author suggests we start carrying video cameras?

You may understand why some experts think eyewitness testimony is unreliable
The next time you are retelling a story, notice what you add
With individual memories all jumbled up with each other
The human brain may be quite remarkable indeed

Answers

author’s suggest carrying video cameras,so you can capture important or cool moments in your life,because memory tends to be vague

the author suggests to carry video cameras around because our memories tend to fade over time

Please help mee read this and summarize the story pleaseee read the whole thing

Answers

Answer:

,,,Explanation:

answer: your picture isn’t loading

explanation: i’m not sure what the picture or story is but to summarize a text just take some important details

Which replacement corrects the spelling error in this sentence??

Answers

The answer is the second option choice
The second it is “affecting” not effecting

someone please help me

Answers

Explanation:

epic 426

non epic 153 hope this will help you

what did u get for the answer??

Which statement accurately describes a cause-and-effect relationship described in this excerpt?

Because Napoleon departs for France, the French army and scholars decide to stay in Egypt.
Because the French army and scholars decide to stay in Egypt, Napoleon decides to depart for France.
Because the French soldiers are tearing down a ruined wall in a fort, they discover the Rosetta Stone.
Because the French soldiers are searching for the Rosetta Stone, they tear down a ruined wall in a fort.

Answers

because the french soldiers are searching for the rosetta stone they tear down a ruined wall in a fort!
because the french soldiers where searching for rosetta stone they ended up tearing the wall

Choose the sentence in which the word in ALL CAPS is used incorrectly.
Group of answer choices

A. The traditional family in China expects the eldest male, usually the grandfather, to be AUTOCRATIC.

B. Although she officially ruled with her brother, Cleopatra was the unquestioned AUTOCRAT of Roman Egypt.

C. Children learn to be self-governing by gradual practice in AUTOCRACY.

D. By dividing power among the legislative, judicial, and executive branches of government, the U.S. Constitution prevents a president from becoming an AUTOCRAT.

Answers

Answer:

c

Explanation:

the answer is c!! hope this helps

PLZ PLZ HELLLLPPP ME I WILL GOVE BRAINS AND 50 POINTS!!!!!!!
Match the definition to the word.


defamation

the act of forcing one to leave a group, often a means of punishment

fabulous

pertaining to the Holy Scripture


Biblical (or biblical)

the religion of the followers of Jesus Christ

Christianity

a dispute between people

grammatical

brave

courageous

disgrace or dishonor on a person



inaccessible

correctly, properly

duly

unreachable

argument

pertaining to fables; amazing or incredible in nature


expulsion

conforming to the rules of a language

Answers

Answer:

Explanation:

fabulous: pertaining to fables; amazing or incredible in nature

biblical: pertaining to the Holy Scripture

christianity: the religion of the followers of Jesus Christ

grammatical: conforming to the rules of a language

brave: courageous

inaccessible: unreachable

expulsion: the act of forcing one to leave a group, often a means of punishment

duly: correctly, properly

defamation: disgrace or dishonor on a person

(you didn't give much clarification had to guess which ones were the words and definition)

Answer:

pertaining to the Holy Scripture = Biblical (or biblical)

Christianity = the religion of the followers of Jesus Christ

the act of forcing one to leave a group, often a means of punishment = expulsion

conforming to the rules of a language = grammatical

disgrace or dishonor on a person = defamation

a dispute between people = argument

courageous = brave

pertaining to fables; amazing or incredible in nature = fabulous

Inaccessible = unreachable

correctly, properly = duly

PLEASE HELP ME
i relly need help

Answers

Answer:

b

Explanation:

Answer:

D is the answer

Explanation:

D is the most respectful and efficient response to this.

Please give me brainliest if I helped!

One of the girls brought some candy for you.

The prepositional phrase(s) is/are _____.

brought some candy
for you
of the girls
some candy
one of the girls

Answers

Answer:

for you

Explanation:

A prepositional phrase is a group of words consisting of a preposition, its object, and any words that modify the object.

Answer:

for you

Explanation:

Solve this analogy.

teacher:educate::politician:_____

office
govern
attorney
senator

Answers

Answer:

govern

Explanation:

teachers educate and politicians govern

Teacher is to educate as politician is to govern

What point of view does Emily Brontë use in this excerpt from the novel Wuthering Heights?


In all England, I do not believe that I could have fixed on a situation so completely removed from the stir of society. A perfect misanthropist’s heaven: and Mr. Heathcliff and I are such a suitable pair to divide the desolation between us. A capital fellow! He little imagined how my heart warmed towards him when I beheld his black eyes withdraw so suspiciously under their brows, as I rode up, and when his fingers sheltered themselves, with a jealous resolution, still further in his waistcoat, as I announced my name.



A.
first-person point of view
B.
second-person point of view
C.
third-person limited point of view
D.
third-person omniscient point of view

Answers

First person view.You can tell because she’s using words like “I” that shows that she is speaking from her own point of view.
A.
First person point of view Bc it says “I”

What does William find in the library that inspires him to put his dreams of becoming a scientist into action?
BOY WHO HARNESSED THE WIND

Answers

Inspirational book on aviation
One Saturday, Gilbert and William meet at the library. William finds a science textbook with diagrams and pictures that he finds very easy to understand. ... While the books are difficult for William to get through, he is lucky to have these books available when other rural students might not have that advantage

Make sure to change a few words just so it sounds like it is coming from you, and that it matches other work you have turned in :)

Identify each of the following sentences as simple, compound, complex, or compound-complex.

1. He didn’t want any vegetables or rice with dinner.

2. Do you want the pasta, or would you prefer the steak?

3. In Paris last year we saw many attractions, including the Eiffel Tower.

4. After the game on Thursday, we are going to the movies.

5. After you go to the game on Thursday, come to dinner with us.

6. The book that is on the shelf is yours, and you can take it whenever you want it.

7. Although the cookies were burned, they tasted good.

8. Jamie and Ralph called me last night and then came over for a visit.

Answers

Answer:

Explanation:

Which one

simplecompoundsimplesimplecomplexcompound and complexcomplexsimple

Explanation:

need this rigth now plz help

Answers

Answer:

c

Explanation:

because no where in the paragraph does it say that ALL junior college students choose to also go to a regular college, and the whole point of this paragraph is to tell the reader that it many people decide to go to a junior college first, because it’s cheaper. hope this helped

i think the answer is c

Which of these best describes how to reduce wordiness in this sentence??

Answers

I’d choose the last one but it may not be correct.

The first one because the sentence has no need to know about when it was after New Years because you start your new year resolution after the New Years

Which statement best evaluates the effectiveness of the conclusion
paragraph?
Thesis Statement: My future job must include human interaction, a
nontraditional workspace, and teamwork.
Main Points:
1. Work with people
2. Work in a nontraditional workspace
3. Work in a place where coworkers share ideas
Conclusion: In the end, my future job will be one that allows me to
collaborate with my coworkers in dynamic and nontraditional
workspaces. If I am forced to sit behind a desk I will be extremely bored. Furthermore, I will be less productive if I am forced to work alone without the chance to discuss ideas with my coworkers. So the next time an adult asks me what I want to do when
I grow up, I will tell them a job without a desk, in an office full of
people. That's my dream job!

A. The conclusion is effective because it presents interesting information not addressed in the body paragraphs.
B. The conclusion is ineffective because it does not restate the thesis in a new way.
C. The conclusion is effective because it restates the thesis, summarizes the main points, and includes a satisfying close.
D. The conclusion is ineffective because it fails to leave the reader with a thought-provoking question.

Answers

I think the answer will be B because I’m smart and I know how to do that
The answer for this question is C.

Write a silly story about a talking animal. Include dialogue in your story.

Answers

Answer:

Winnie the Pooh

Explanation:

look him up, its as good as it gets ;)

THE HARE AND THE TORTOISE
By Rob John
‘Look at me!’ said the Hare to the other animals. ‘Just look how fast I can run.’
The Hare ran across a field as fast as he could. All the animals agreed that yes the Hare was very fast. The Hare ran back.
‘See,’ he shouted. ‘I’m not even out of breath.’
‘Yeah, that was fast,’ said a Fox.
‘So who wants a race?’ said the Hare. ‘Anybody think they could beat me?’
None of the animals spoke.
‘See,’ said the Hare. ‘You’re all too scared to even try.’
‘I’ll have a go,’ said the Tortoise.
The Hare laughed. ‘You? The slow- est creature in the whole world? I’m not wasting my time racing a Tortoise.’
‘What’s the matter?’ said the Tortoise. ‘Scared I might beat you?’
Some of the animals laughed at that so the Hare said, ‘Alright then, Tortoise. Let’s have a race...right now...then we’ll see who’s laughing.’
‘Not today,’ said the Tortoise. ‘We’ll race next week. Got to do a bit of training first.’
Next morning the animals watched the Tortoise do his ‘training’. First he did some gentle stretching exer- cises to warm himself up...
...and then he started to run.
‘Has he started running yet?’ asked the Fox.
‘Hard to tell with Tortoises,’ said the Badger. ‘He’s definitely moving.’
‘Is he?’ said the Fox.
‘Tortoise, are you sure about this?’ said the Crow. ‘I mean the Hare IS very fast and you...well...’
1

‘Don’t worry,’ said the Tortoise. ‘This is just day one. I’ll speed up. You’ll see.’
On the day of the race crowds of animals came to watch. The Tortoise slowly made his way to the starting line and then suddenly...
...the Hare arrived at top speed wearing a brand new track suit and four expensive-looking trainers.
‘The race starts here.’ said the Fox pointing to a line on the ground. ‘And ends at that tree on the other side of the field. First one to touch the tree is the winner.’
‘Right, let’s get on with it,’ said the Hare. ‘Ready Tortoise? Ready to see some real speed?’
‘I’m ready,’ said the Tortoise.
‘Ready, steady...go!’ said the Fox and the race began.
The Hare roared off then stopped and looked back. The Tortoise was still crossing the starting line. The Hare ran back to the Tortoise.
‘Didn’t you hear him say go? You can start, you know.’
‘I have started,’ said the Tortoise.
‘Look,’ said the Hare. ‘You’re going so slowly I’m going to have a rest. Might even have a little sleep. I’ll finish the race when I wake up and still beat you by miles.’
The Hare lay down in the sun and fell asleep. The Tortoise kept going. Slowly, steadily he moved across the field and by evening time he was getting close to the finishing tree. Still the Hare slept on and now the animals started to get excited.
‘You know what? I think he might win,’ said a Rabbit.
‘I can’t believe it,’ said the Badger. ‘The Tortoise might actually win.’
The animals started to get excited and as the Tortoise got close to the finishing tree they started to cheer.
‘Come on Tortoise,’ they shouted. ‘Nearly there. Keep going old friend. Keep going.’
But the noise of the cheering crowd woke up the Hare. He looked across the field, saw the Tortoise about to reach the tree and in a flash he was running.
2

The Tortoise heard the Hare thund- ering up behind him but he kept going...and going...and suddenly he was there. Just in time the Tortoise touched the tree with
his nose. He’d done it. The Tortoise had beaten the Hare fair and square.
‘There you go,’ said the Badger. ‘Slow and steady’s sometimes bet- ter than fast and flashy.’
‘Not fair,’ said the Hare. ‘I was asleep. We have to run the race again. It’s not fair.’
But no-one was listening to the Hare
Other Questions
(6) Match the columns :Column 1(1) Funaria(2) SpirogyraColumn IIka) Spiral chloroplastb) Capsule(c) Leafletsd) Flowers Etica, creatividad, compromiso, excelencia, integridad, credibilidad, pueden ser ejemplos de visiones.Es VERDADERO O FALSO? . Si es Falso lo justificas. A sample of oxygen gas has a volume of 453.7 mL when its pressure is 0.435 atm. What will the volume of the gasbeat a pressure of 0.88 atmospheres, if the temperature remains constant? Which of the following factors would LIMIT carrying capacity?A. Far from factories or roadsB. A large nearby riverC. Abundant foodD. A small space to live in Can you please answer me these question.I think someone like to read poem and answer the question. Mr. Johnston needs a shelf to hold a set of textbooks, each 1 3/4 in. Wide. How many books will fit on a 35-in.-long shelf? PLEASE HELP ill give brainliest to best and correct answer As project manager, Gabriella has discovered a major problem that could affect the remainder of the project.What should she do before deciding how to resolve the problem? Find the missing value.Hint: Use the number line to find the missing value.-5 = -8-H-15-10-5051015Stuck? Review related articles/videos or use a hint. Balance the following equations Ag (s) + H S(g) + 0 (g) Ag S() + H0 Javed is the best batsman of them all.( Convert into negative sentence) How much of a circle does a 100-degree angle turn through?A.1B.100/180C.50/360D.100/360 Justin is saving money to buy a stereo. He has $25 saved in the bank right now. He earns $40 each week delivering newspapers. Let y = the total amount of money Justin has, and x is in weeks. To what extent does our civil and criminal court systems promote justice? Consider thefollowing: How does our criminal justice system promote due process and maintain orderin society? How does our civil justice system promote fairness for individuals? What are the foundations for building society in your view? solve for x please help! The first part of every article is the body.TrueFalse 10. In the year 2016, Florida reported more than __________ fatalities in police-reported motor vehicle crashes. what us 10 to the power of two Oxit baz c nhng tnh cht ha hc no?