circle the correct terms for the reaction going from left to right. reactant a gains/loses and electron to become product B

Answers

Answer 1

The question requires one to indicate the correct terms for the reactant from left to right.

What is a reactant?

A reactant is a material that enters and changes during a chemical reaction.

1. Reactant A (Gains/Loses) and electron to become product B

To produce B, reactant A loses one electron. The loss of one electron from an atom causes the atom to be oxidized.

Reactant A gives an electron to NAD+ and is transformed to B+ in the given reaction there is an increase in the positive charge. As a result, reactant A is oxidized to produce B+.

2. NAD+ becomes reduced in the process of the reaction.

NAD+ receives the electron given to it by reactant A and is reduced to NADH. As a result, the positive charge of NAD+ decreases.

3. NADH is more reduced than NAD+

NAD+ receives an electron and becomes NADH. As a result, NADH is decreased more than NAD+

4. NAD+ is in the more oxidized state compared to NADH

NAD+ has a surplus of positive charge as opposed to NADH. NAD+ must receive one electron in order to produce NADH. As a result, as opposed to NADH, NAD+ is more oxidized.

5. Reactant A is the electron donor in this reaction.

Reactant A loses one electron, resulting in positively charged B+. This electron is taken up by NAD+, which reduces to NADH. As a result,  the electron donor is reactant A.

6. Reactant A is the reducing agent in this reaction.

A reducing agent is a molecule that can transfer electrons.

Such a molecule has the potential to decrease another molecule while also becoming oxidized. Reactant A is the reducing agent in the given reaction, donating an electron to NAD+.

Following the electron transfer, reactant A is oxidized to product B+, and NAD+ is reduced to NADH.

Learn more about reactant at;
https://brainly.com/question/26283409
#SPJ1

Circle The Correct Terms For The Reaction Going From Left To Right. Reactant A Gains/loses And Electron

Related Questions

Jackson has scores of 80, 90, 83, and 81 on four Math quizzes. What is the score he needs on the next quiz to achieve an average above 85?

Answers

I think his score on his math test is going to need to be in the range of 79-84 which will get him there.
Hope this helps sorry if I’m wrong and be safe out there!!

1. Use hollow blocks for constructions such as_____________.
2. Concrete hollow blocks are made from ________________ and cement to be formed into sizes.
3. The bricks are made from ______ and other materials.
4. Place the newly formed blocks into ______ to dry and solidify
5. Bricks are placed into _________ where high temperature bakes the materials.
6. The _________ are loose particle commonly found near the shorelines.
7. Gravel are loose ______________of rock fragments.
8. Steel square / try square is used to check ___________________.
9. Bolts and nuts can be tighten and loosen using ________.
10. Only qualified __________________ is allowed to work in concrete operations
11. Always consult to drawing _______ when working with masonry operations
12 The vertical alignment of scaffold is checked using ______________________.
13. Never use _______________ water in concrete mixture.
14. Cement is a combination of ___________ and aluminates.
15. We use ___________ in mixing large amount of mortars.

Mason Plumb bob PPEs Fine Aggregates
Spade ScaffoldBolts & nuts
UncleanAggregates Spirit Level Bar
PlatformLumber Oven
Wrench Squareness Sun heat
Plan Walls Hard & even

Answers

Answer:Use hollow blocks for constructions such as walls, partitions, fences, and other load-bearing structures.

Concrete hollow blocks are made from fine aggregates (such as sand) and cement to be formed into various sizes.

The bricks are made from clay and other materials.

Place the newly formed blocks into a curing area to dry and solidify.

Bricks are placed into an oven (or kiln) where high temperature bakes the materials.

The aggregates are loose particles commonly found near the shorelines.

Gravel is a loose collection of rock fragments.

Steel square / try square is used to check the squareness and accuracy of corners and angles.

Bolts and nuts can be tightened and loosened using a wrench.

Only qualified masons or personnel with proper training and certification are allowed to work in concrete operations.

Always consult the drawing or blueprint when working with masonry operations to ensure accuracy and compliance with design specifications.

The vertical alignment of the scaffold is checked using a spirit level or plumb bob.

Never use unclean water in the concrete mixture to avoid compromising the quality of the material.

Cement is a combination of calcium silicates and aluminates.

We use a platform or lumber in mixing large amounts of mortars to facilitate the process and ensure even mixing.

1. Use hollow blocks for constructions such as walls, partitions, fences, and other load-bearing structures.
2. Concrete hollow blocks are made from aggregates and cement to be formed into different sizes.
3. The bricks are made from clay and other materials.
4. Place the newly formed blocks into a curing area to dry and solidify.
5. Bricks are placed into an oven where high temperature bakes the materials.
6. The aggregates are loose particles commonly found near the shorelines.
7. Gravel are loose fragments of rock.
8. Steel square / try square is used to check the squareness of corners and edges.
9. Bolts and nuts can be tightened and loosened using a wrench.
10. Only qualified personnel is allowed to work in concrete operations while wearing the appropriate personal protective equipment (PPEs).
11. Always consult the drawing plan when working with masonry operations.
12. The vertical alignment of scaffold is checked using a spirit level.
13. Never use unclean water in a concrete mixture.
14. Cement is a combination of silicates and aluminates.
15. We use a spade or a platform to mix large amounts of mortars.

Describe the wastewater treatment that occurs at the Back River Wastewater Treatment Plant

Answers

The Back River Wastewater Treatment Plant utilizes a multi-step process to treat wastewater. It includes physical, biological, and chemical treatments to remove contaminants, reduce pollutants, and produce treated water that meets regulatory standards for discharge into the environment.

What is wastewater treatment?

Wastewater treatment is the   process of removing and eliminating impurities from wastewater and convertingit into effluent that may be recycled into the water cycle.

When returned to the water cycle,the effluent has a low   environmental impact or is utilised for other uses.

Learn more about wastewater at:

https://brainly.com/question/13348717

#SPJ1

Do you think each type of form plays an important role to one another? Explain

your insights.​

Answers

Answer:

Insight is the understanding of a specific cause and effect within a particular context. The term insight can have several related meanings:

Explanation:Insight is the understanding of a specific cause and effect within a particular context. The term insight can have several related meanings:a piece of information

Explanation:Insight is the understanding of a specific cause and effect within a particular context. The term insight can have several related meanings:a piece of informationthe act or result of understanding the inner nature of things or of seeing intuitively (called noesis in Greek)

Explanation:Insight is the understanding of a specific cause and effect within a particular context. The term insight can have several related meanings:a piece of informationthe act or result of understanding the inner nature of things or of seeing intuitively (called noesis in Greek)an introspection

Explanation:Insight is the understanding of a specific cause and effect within a particular context. The term insight can have several related meanings:a piece of informationthe act or result of understanding the inner nature of things or of seeing intuitively (called noesis in Greek)an introspectionthe power of acute observation and deduction, discernment, and perception, called intellection or noesis

Explanation:Insight is the understanding of a specific cause and effect within a particular context. The term insight can have several related meanings:a piece of informationthe act or result of understanding the inner nature of things or of seeing intuitively (called noesis in Greek)an introspectionthe power of acute observation and deduction, discernment, and perception, called intellection or noesisAn understanding of cause and effect based on the identification of relationships and behaviors within a model, context, or scenario (see artificial intelligence)

Explanation:Insight is the understanding of a specific cause and effect within a particular context. The term insight can have several related meanings:a piece of informationthe act or result of understanding the inner nature of things or of seeing intuitively (called noesis in Greek)an introspectionthe power of acute observation and deduction, discernment, and perception, called intellection or noesisAn understanding of cause and effect based on the identification of relationships and behaviors within a model, context, or scenario (see artificial intelligence)An insight that manifests itself suddenly, such as understanding how to solve a difficult problem, is sometimes called by the German word Aha-Erlebnis. The term was coined by the German psychologist and theoretical linguist Karl Bühler. It is also known as an epiphany, eureka moment or (for cross word solvers) the penny dropping moment (PDM).[1] Sudden sickening realisations identifying a problem rather than solving it, so Uh-oh rather than Aha moments are further seen in negative insight.[2] A further example of negative insight is chagrin which is annoyance at the obviousness of a solution missed up until the point of insight,[3] an example of this being the Homer Simpson's catchphrase exclamation, D'oh!.

PLEASE MARK ME AS BRAINLIEST

help help help help help esp​

Answers

I don’t know this language , sorryyyyy

How do the result of Albert bandura’s experiment support zumbareis theories about immoral behavior

Answers

The results of Albert Bandura's experiment support Zimbardo's theories about immoral behavior because in his experiment he found out that people's aggression and evilness increased when they think they are anonymous and unidentifiable.

which of the following can lead to a distracted teen driver who engages in reckless driving

Answers

Answer:

texting and driving or not keeping your hands on the wheel at all times

Explanation:

What do the arrows at point 3 indicate

Answers

There is no picture in the question you asked but the answer is cool air is above water

Answer:

air cool

Explanation:

im taking the test

While Jenner's interest in the protective effects of cowpox began during his apprenticeship with George Harwicke, it was 1796 before he made the first step in the long process whereby smallpox, the scourge of mankind, would be totally eradicated. For many years, he had heard the tales that dairymaids were protected from smallpox naturally after having suffered from cowpox.

—"Edward Jenner and the History of
Smallpox and Vaccination,"
Stefan Riedel

Which statements support the claim that Jenner has been given credit for starting and spreading the practice of immunization?

Jenner became interested in the protective effects of cowpox during his apprenticeship.
Jenner’s mentor was George Harwicke.
Jenner made the first step to erase smallpox.
Smallpox is called the scourge of mankind.
Jenner heard stories of cowpox helping to save people from smallpox.

Answers

Jenner made the first step to erase smallpox and Jenner heard stories of cowpox helping to save people from smallpox support the claim that Jenner has been given credit for starting and spreading the practice of immunization.

These statements show that Jenner was the one who took the first step towards eradicating smallpox by investigating the link between cowpox and smallpox immunity. Additionally, the fact that he had heard stories of cowpox protecting people from smallpox suggests that he was the one who popularized the idea of using cowpox as a means of immunization. However, the statements about Jenner's apprenticeship, mentor, and the severity of smallpox are not directly related to his contribution to the practice of immunization.

Marisol is selling snacks at her school’s soccer games to raise money for a service project. She buys nuts in cases that contain 24 bags and granola bars in cases that contain 20 packages. She sells the nuts for $1.25 a bag and the granola bars for $1.75 a package. If she raised $160 and sold 112 items, how many cases of granola bars did Marisol buy?

Answers

Answer:

2 cases of granola bars

Explanation:

This is a classic system of equations type question.

24n + 20gb = 112 as she can only buy the items in these quantities and this is how many she bought in total

30n + 35gb = 160 as this is how much money she earns per case

I like to solve using elimination when possible. So we can multiply the first equation by 1.25

30n + 25gb = 140 then subtract this from the second equation

10 gb = 20 then divide by 10

gb = 2

The girl with blue hat sits next to the tree



no change



The girl sits next to the tree with blue hat



With blue hat the girl sits next to the tree

Answers

is that a question or because i am a little confused

Ummm this doesn’t make sense

what force is a contact force?

Answers

A contact force is any force that requires contact to occur. ... Contact forces are often decomposed into orthogonal components, one perpendicular to the surface(s) in contact called the normal force, and one parallel to the surface(s) in contact, called the friction force. Hope this helps you

Answer:

It is any force that requires contact to happen. There is frictional force, applied force, and normal force.

Psychology What is one source error associated with self-report inventories, and what is one of its solutions?

Answers

Answer:

one source error associated with self-report inventories is that some people aren't very self-aware or may jump to conclusions about their systems or disorders without taking a step back and assessing all of the possibilities. a solution to this would be having the assessment taker speak to a professional, or trying to make them report their symptoms as objectively as possible.

Explanation:

Answer:

One source error is deliberate deception, and one of its solutions is having a lie scale inserted into the assessment. Another source error is social desirability, and one of its solutions is locating questions sensitive to bias and changing or dropping them. Another source error is response set, and two of its solutions are using word variations and writing questions on the assessment in different ways.

Explanation:

sample answer on edge ;)

On a merry-go-round, 16 horses are evenly spaced on the outside perimeter. Abe is opposite
to the first horse. It takes 6 seconds for the fifth horse to reach Abe. How long will it take the merrygo-round to go around once? Draw a clear diagram to answer this question.

plzz help could you sho work

Answers

Explanation:

no it's you know for getting them for this

Mary and Keisha run with the same constant speed but in opposite directions. The girls have: A. The same position B. Different accelerations C. Different speeds D. Different velocities

Answers

Answer:

D

Explanation:

Mary and Keisha run with the same constant speed but in opposite directions. The girls have different velocities. Hence option D is correct.

What is velocity?

According to a particular point of view and a particular unit of time, velocity is the rate at which an object changes position while travelling in one direction. Velocity is a vector quantity. It has both a magnitude and a direction. Therefore, it alters whenever either the speed or the direction do. The meter per second is the accepted unit of magnitude for velocity.

One might refer to an object as accelerating if either the magnitude or direction of the velocity vector changes. An object moving in a circle at a constant speed can be said to accelerate because the direction of the velocity changes.  Although the object is moving at a constant speed, its velocity is changing. As a vector, velocity has a fixed magnitude but a fluctuating direction.

Thus, Mary and Keisha run with the same constant speed but in opposite directions. The girls have different velocities. Hence option D is correct.

To learn more about velocity, refer to the link below:

https://brainly.com/question/18084516

#SPJ2

How can you take a screenshot on an HP computer?

Answers

Answer:

hi! Its easy!

Explanation:

You have to press the Windows key and then press the prt sc press them at the same time

Answer:ou hit ctrl+shift+ a picture that looks like a rectangle with two lines next to it. Or you can hit ctrl+alt+ the picture again.

Explanation:

12
DALILAH
Bakari is making a scale model of a large cylindrical building. The scale model has a volume that
of the building. To determine the radius and height of the scale model, Bakari divided both the ra
by 8 because the formula for the volume of a cylinder only has 2 variables.
Which statement is true?
Bakari is correct.
Bakari is incorrect. He should have divided the radius and height by 2.
Bakari is incorrect. He should have divided the radius and height by 4.
Bakari is incorrect. He should have divided the radius and height by 16.

Answers

Answer:  Bakari is correct

Explanation:

Bakari is correct. If he divided both the radius and height by the same factor (in this case, 8), then the resulting scale model will have the same proportions as the original building, just scaled down by a factor of 8. The formula for the volume of a cylinder is V = πr²h, which only has two variables (the radius and height). So if Bakari wants to maintain the same proportions of the cylinder in his scale model, he needs to divide both the radius and height by the same factor. This will result in a scale model with a volume that is 1/8th the volume of the original building.

Bakari is correct.

If the scale model has a volume that is 1/8 of the volume of the actual building, then the dimensions of the scale model must be 1/2 the dimensions of the actual building in order to maintain the same proportions. This means that Bakari should divide both the radius and height of the actual building by 2 in order to determine the radius and height of the scale model. Therefore, his method of dividing both the radius and height by 8 is correct.

Which of the following sentences from the passage supports the idea that Mendel’s discoveries were the result of hard work rather than chance?

Answers

Answer:

Without the support of modern genetics and molecular biology, Mendel was able to discern fundamental rules of inheritance that still hold true today.

This sentence from the passage supports the idea that Mendel's discoveries were the result of hard work rather than chance. It highlights the fact that Mendel was able to discern fundamental rules of inheritance through his own efforts, even without the support of modern genetics and molecular biology. This suggests that Mendel's discoveries were the result of intentional and deliberate experimentation and observation, rather than luck or happenstance.

I did not sign up for a brainly account an want to cancel any membership that I have. It was billed to my amex card

Answers

Answer:

Thats sad

Explanation:

(1) Farmer Ben has only ducks and cows 21 in total. He can’t remember how many of each he has. He knows
that the animals have a total of 52 legs. Assuming that each animal has all legs intact and no extra
limbs, how many of each animal does farmer Ben have? Draw a clear diagram to answer this question.

(2) On a merry-go-round, 12 horses are evenly spaced on the outside perimeter. Abe is opposite to the first
horse. It takes 4 seconds for the fourth horse to reach Abe. How long will it take the merry-go-round to
go around once? Draw a clear diagram to answer this question. Make a Diagram and solve this problem.


(3) Charmin’s daughter has $6.00 she wants to spend on a comic books and superhero cards. Comic books
cost 75 cents each, and deluxe packages of superhero cards cost $1.50 each. List all the ways she can
spend all of her money on comic books, superhero cards , or both.

(4) In how many ways can one add only three positive even numbers and get 22? Make a systematic list
and show all the possibilities.

THIS IS MY EXAM FOUR QUESTIONS CAN SOMEBODY PLZZ HELP ME AN SHOW THE WORK FROM THE BOTTOM OF MY HEART PLZZ

Answers

Answer:

Answer of question 1 :

Explanation:

Let x be the legs of ducks

And y be the legs of cows

According to the question,

2x + 4y = 52...…..(i) ( as ducks ahs two legs and as cows has 4 legs)

As he has 21 animals in total so,

x + y = 21...…..(ii)

We have make the equation. We will solve them by eliminatory method or substitution method. Here, I'll go for substitution method.

From equation (ii)

x = 21 - y....…..(iii)

Putting the value of x in equation (i),

2x + 4y = 52

2( 21 - y ) + 4y = 52

42 - 2y + 4y = 52

2y = 52 - 42

y = 10/2

y = 5 ( He has 2 cows)

putting the value of y in equation (ii)

x + y = 21

x + 5 = 21

x = 21 -5

x = 16 ( He has 16 ducks)

help me!!!
pllssss
thankk​

Answers

Answer:

which part of the question would u like help with and I can answer it for you. ask in different way

in basketball, a field goal is either 2 or 3 points. in a college basketball tournament, jim made 73 more 2-point field goals than 3-point field goals. if he scored a total of 216 goals in the tournament, how many 3-point field goals did he make?

Answers

Answer:

72

Explanation:

216/3 is 72

PART A: Which of the following identifies the central idea of the text?
A. Studies show that motherhood does not get easier as soon as many believe, due to stress and feelings of dissatisfaction mothers often experience during the middle school years.
B. Studies show that the satisfaction of mothers is at an all-time low in the years following the birth of their child due to feelings of exhaustion.
C. Studies support the belief that mothers’ feelings of exhaustion and dissatisfaction improve greatly when their child matures during puberty.
D. Studies show how the experience of motherhood greatly varies from mother to mother, and therefore the most difficult time of motherhood cannot be determined.

2. PART B: Which section from the text best supports the answer to Part A?
A. “In the early years, when motherhood is often portrayed as especially demanding, mothers reported high levels of parenting ‘overload.’” (Paragraph 6)
B. “By the time children reached adulthood, mothers reported significantly lower levels of parenting overload and guilt but maintained relatively high levels of parenting satisfaction.” (Paragraph 7)
C. “It was between these two periods that mothers reported the highest levels of dissatisfaction with parenting, with mothers of middle-school children representing the peak.” (Paragraph 8)
D. “Importantly, these trends reflected group averages; there was considerable variation in the experiences of individual mothers.” (Paragraph 9)

3. PART A: What is the meaning of “rosy” in paragraph 1?
A. knowledgeable
B. unrealistic
C. validating
D. optimistic

4. PART B: Which detail from the text best supports the answer to Part A?
A. “from more than one slightly more-seasoned mom” (Paragraph 1)
B. “It’s a message of hope and encouragement” (Paragraph 2)
C. “a recognition of how hard some aspects of early motherhood can be”
(Paragraph 2)
D. “But according to new research, it might also be wrong.” (Paragraph 2)

Answers

Answer:

1. A

Explanation:

Common lit

Studies show that motherhood does not get easier as soon as many believe, due to stress and feelings of dissatisfaction mothers often experience during the middle school years. The correct options are A, C, D, and D respectively.

What is central idea?

The central idea is the story's central, unifying element, which connects all of the other elements of fiction used by the author to tell the story.

The central idea is best described as the story's dominant impression or the universal, generic truth.

The section “It was between these two periods that mothers reported the highest levels of dissatisfaction with parenting, with mothers of middle-school children representing the peak” best supports the answer to Part A.

The meaning of “rosy” in paragraph 1 is optimistic.

The detail from the text best supports the answer to Part A is “But according to new research, it might also be wrong.”

Thus, the correct options are A, C, D, and D respectively.

For more details regarding central idea, visit:

https://brainly.com/question/8282081

#SPJ3

The lunch bill for the group was $45. Their total bill was 54 dollars, including the tip. What percent did they pay in tip? _________%

Answers

They paid $9 in tip, which is 20% of the original bill ($45). To find out, you can subtract the cost of the food from the total bill: $54 - $45 = $9. Then, you can divide the tip amount by the original cost of the food and multiply by 100 to get the percent: ($9 / $45) x 100 = 20%.

The function p is defined by p(h) = 2h+h. If
k>-2 and p(k)= P(-2), what is the value of k?
A) -1
B) 0
C)1
D) 2

Answers

Answer:

it's D

Explanation:

basta D di ako sure

whats Tommy's favorite color is his dads is green and moms is yellow
A. lime green
B. yellow snow
C. red
D. naruto​

Answers

Dattebayooo is the answer

Adam's income was increased by 5 percent in may. If he received 1102.50 in may, find his income in april

Answers

1050


Let’s call his April income y.
An increase of 5% is equal to 1.05.
y x 1.05 = 1102.5
y = 1102.5/1.05 = 1050

1/12x-1/12y=13
1/3x-1/6y=20

Answers

Answer:

Explanation:

X=-36 and y is -192

U-U * i must say :O REEEeeeeeeeeee *gets thrown of window * levi: :P ha now stop texting -__- * * T^T am hiding for the love of god .....i hate meh bro

Answers

The advancement of uwueuwu is the correct answer

Answer:

h

Explanation:

PLEASE HELP the answer it says is D while I think it is A
But also A is kinda off as well SO I DON'T KNOW

Answers

The choice that offers an accurate interpretation of the data in the chart is D) a slightly higher rate of atherosclerosis than.

What is the graph about?

The graph shows that patients who follow a low-cholesterol diet but do not exercise daily experience roughly 30% fewer cases of atherosclerosis than patients who do not follow a low-cholesterol diet and do not exercise daily.

Therefore, the accurate interpretation of the data in the chart is that patients who follow a low-cholesterol diet but do not exercise daily have a slightly higher rate of atherosclerosis than patients who do not follow a low-cholesterol diet and do not exercise daily.

Find out more on graphic representation here: https://brainly.com/question/28350999

#SPJ1

Other Questions
The nurse asks a patient to smile, blow out his cheeks, raise his eyebrows, and close his eyes tightly. The nurse is assessing which cranial nerve examine the map below. Where would you place this period in history realtive to the birth of jesus Bruce pitches for his little brother's baseball team. He has observed that the number of pitches a batter hits varies and is given by the function f(x) = x 11, where x is the number of pitches and f(x) is the number of hits. If batters get {4, 12, 14, 27, 42} hits, how many pitches did Bruce throw? A. {13, 21, 24, 26, 44} B. {17, 24, 27, 28, 35} C. {20, 27, 32, 33, 45} D. {15, 23, 25, 38, 53} what are some things you want money can buy what is trigonometric ratios Balance the equation below and identify the type.NH4NO(s)---> N(g) + HO(l) Howard gardner is most likely to agree that the concept of intelligence includes:. Find unknown angle k68k display the details for just the office expenses group Given : Doctor As data set on glassesDoctor Bs data set on glassesTo Find " mean absolute deviation for Doctor As data set on glassesmean absolute deviation for Doctor Bs data set on glasses If the mayor of a city were asked to deliver a speech at the grand opening of a new branch of the city's library, he or she would be delivering which type of speech Sigmund freud's psychosexual stages focus on several parts of the body, identified as? Where does Paul Bunyan find Babe? Which of the following is equal to the fraction below ?(answers are in the picture) What is the maturity preference theory? Correlational studies have shown that people who graduate from college tend to make more money than people who do not graduate from college. The MOST appropriate conclusion that can be drawn from this fact is that graduating from college: Which political leader supported the Indian Removal Act? During transcription, mRNA is produced from the antisense strand of DNA. This means that the mRNA will match theplease answer only if you are sure A) antisense strand of DNA, substituting thymine for uracil.B) antisense strand of DNA, substituting uracil for thymine.C) sense strand of DNA, substituting uracil for thymine.D) sense strand of DNA, substituting thymine for uracil. The heat from the bonfire is transferred to the student's hands through the process ofconductionconvectionradiationreflection STORIES OF USEFUL INVENTIONS, excerptBy S. E. Forman1911THE MATCH(There never was a time when the world was without fire, but there was a time when men did not know how to kindle fire; and after they learned how to kindle one, it was a long, long time before they learned how to kindle one easily. In these days we can kindle a fire without any trouble, because we can easily get a match; but we must remember that the match is one of the most wonderful things in the world, and that it took men thousands of years to learn how to make one. Let us learn the history of this familiar little object, the match.)Fire was first given to man by nature itself. When a forest is set on fire by cinders from a neighboring volcano, or when a tree is set ablaze by a thunderbolt, we may say that nature strikes a match. In the early history of the world, nature had to kindle all the fires, for man by his own effort was unable to produce a spark. The first method, then, of getting fire for use was to light sticks of wood at a flame kindled by natureby a volcano, perhaps, or by a stroke of lightning. These firebrands were carried to the home and used in kindling the fires there. The fire secured in this way was carefully guarded and was kept burning as long as possible. But the flame, however faithfully watched, would sometimes be extinguished. A sudden gust of wind or a sudden shower would put it out. Then a new firebrand would have to be secured, and this often meant a long journey and a deal of trouble.In 1827, John Walker, a druggist in a small English town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. The druggist had discovered the first friction-chemical match, the kind we use to-day. It is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. Although Walker's match did not require the bottle of acid, nevertheless it was not a good one. It could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. In a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. The match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. It would ignite when rubbed on any dry surface, and there was no longer any sputtering. This was the phosphorus match, the match with which we are so familiar. Which line from the parentheses paragraph shows the value of the match?A. but there was a time when men did not know how to kindle fireB. it was a long, long time before they learned how to kindle one easilyC. There never was a time when the world was without fireD. In these days we can kindle a fire without any trouble, because we can easily get a match