Why is the earth’s atmosphere important

Answers

Answer 1

Answer:

atmosphere is an important part of what makes Earth livable and it blocks some of the Sun's dangerous rays from reaching Earth

Explanation:

Answer 2

Final answer:

The Earth's atmosphere is vital for life, providing essential gases for biological processes, playing a role in the water cycle, and regulating Earth's climate through the greenhouse effect. The atmosphere's composition and structure enable it to trap heat and maintain temperatures suitable for life. Human activities can influence the atmosphere and lead to consequences like global warming.

Explanation:

The Earth's atmosphere is crucial for many reasons. It is the layer of gases surrounding our planet, which includes a mix of nitrogen (78%), oxygen (21%), and other gases like argon, carbon dioxide, and water vapor. These gases are essential for life as we know it, providing oxygen for cellular respiration and carbon dioxide for photosynthesis. Additionally, the atmosphere plays a key role in the water cycle, replenishing our freshwater sources with precipitation.

Moreover, the atmosphere contributes significantly to Earth's climate system, particularly in the troposphere, which is the layer closest to Earth's surface. This region is responsible for weather patterns and helps maintain temperatures that allow life to flourish. The presence of carbon dioxide and other greenhouse gases, like methane and water vapor, is critical in regulating Earth's temperature by trapping heat through the greenhouse effect.

Over time, life on Earth and geological activity have transformed our atmosphere, making it unlike that of Mars or Venus, which are dominated by CO2. Humans, through actions like burning fossil fuels, can significantly impact the atmosphere and contribute to issues like global warming.

The total mass of the atmosphere may seem small in comparison to Earth's total mass, yet it exerts a profound influence on the planet's environment. The atmosphere also has an ionosphere, where solar activity ionizes atoms, and some lightweight atoms can escape Earth's gravitational pull, such as hydrogen and helium.


Related Questions

TME PEMAINING

59:47

Read this excerpt from The Miracle Worker

ANNIE The only time I have trouble is when I'm til

(But she is amused at herself, as is ANAONOS)

Is it my fault it's so often? I won't give them trouble, Me Anagnos, ll be so ladylike they won't notice I've come

ANAGNOS Annie, be humble it is not as if you have so many offers to pick and choose. You will need their affection

working with this child

Which word best describes Annie in this excerpt?

intelligent

reckless

confident

polite

Save

Mark this and retum

Answers

Answer:

Reckless

Explanation:

The word that best describes Annie in this excerpt is reckless.

It reveals that Annie wasn't showing any carefulness in relating with them.

How did Romeo and his friends sneak into the capulet party

Answers

Answer:One of the servants can't read so he asks Romeo to read the invitation for him. In return the servant invited both of them to the party unknowing that Romeo and his friends are from the Montague family.

Explanation:

I sinned I iskdocoskj kskckkskckciiwi I. iDisk k. Kodak k

Emily loves milk, but she can’t drink it; she’s lactose-intolerant.

Is that a

1. Uniting two closely connected

or

2. Separating items in a complex list.

Semicolon Question

Answers

Answer:

1.) Uniting two closely connected

Explanation:

A semicolon is most commonly used to link (in a single sentence) two independent clauses that are closely related in thought. Use a semicolon between two independent clauses that are connected by conjunctive adverbs or transitional phrases.

1.Uniting two closely connected

The radio broadcast features interviews with hurricanes victims. Why do you think Cheryl Corley includes these interviews instead of just describing the victim’s experiences in detail herself?

Answers

Answer:

She brought the hurricane victims so the listeners would hear their stories from their perspective.

Explanation:

Cheryl Corley was aware that describing the experiences the victims of the hurricane had from a third person perspective would not accurately convey the horrors the victims experienced so she had to include the interviews of the victims themselves so listeners would better the experience from the first person perspective.

When a story is being narrated in the third person narrative, that is another person describing events from a detached view the emotions are not properly captured and the 0erson simply describes it the way he sees it or thinks it happened. It is not an accurate way of describing events.

When narrating an experience in the first person, the person describes it exactly how it happened to them and how they felt when it was happening and how they felt after the event. It is a description based on the descriptor's experience.


Name the four steps of the process that is commonly used for planning a writing project.
Explain the difference between a topic outline and a sentence outline.
Every essay should begin with a hook to catch the reader’s attention. Name three different ways you can begin your introduction in order to hook the reader.

Answers

Thes four-venture process for arranging a composing project incorporates

Directing explorationTaking notesSorting out notesSetting up an outline.

In a topic outline, the topic thoughts are written in phrases rather than in complete sentences. In a sentence outline, every topic in the outline is written in a total sentence.

Decisions incorporate a persuading examination, a story, an alarming occurrence, or a striking subtlety. Any of these will get the peruser's consideration and interest.

The two principle sorts of outlines are the topic outline and the sentence outline. In the topic outline, the headings are given in single words or brief expressions. In the sentence outline, every one of the headings are communicated in complete sentences.

A sentence outline communicates the focal thoughts of a discourse in complete sentences. Sentence outlines are more definite than topic outlines, however less nitty gritty than first drafts.

A topic outline organizes your thoughts progressively showing which are fundamental and which are sub-focuses, in the grouping you need, and shows what you will discuss. As the name suggests, it distinguishes every one of the little small scale topics that your paper will include, and shows how they relate.

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Select the sentence from the article that suggests

paleontologists were able to make guesses about

the dinosaur only after a close examination.

Answers

This question is incomplete, here´s the complete question

Read "Teeny skull trapped in amber belongs to  smallest dinosaur ever found", By Ben Guarino.

Select the sentence from the article that suggests paleontologists were able to make guesses about the dinosaur only after a  close examination.

(A) "If it's indeed a dinosaur, it's definitely the smallest known extinct dinosaur," said Ohio University  paleontologist Lawrence Witmer.

(B) The researchers' analysis placed the animal "fairly deep in the origin of birds," Schmitz said, but with a  "lot of uncertainty."

(C) In the past, when describing fossils, paleontologists have mistaken young animals for unusually small  species.

(D) The dinosaur probably ate insects and other invertebrates, Schmitz said.

Answer: (B) The researchers' analysis placed the animal "fairly deep in the origin of birds," Schmitz said, but with a  "lot of uncertainty."

Explanation:

The author of the study, a paleobiologist at the Keck Science Center, was Lars Schmitz. Schmitz first approach through a digital scan of the creature's skull led to the belief that it was an animal in the origin of birds, but this idea carried a "lot of uncertainty."

It was only after closer examination they could conclude that Oculudentavis khaungraae was likely the smallest species of a dinosaur ever found.

What inference does the passage best support?

Most Russians in the 1890s were not wealthy.
Most English citizens were very wealthy.
Russians did not run their farms well.
English people were fonder of sweets.

Answers

Answer:

A) Most Russians in the 1890s were not wealthy.

Explanation:

The inference that the passage best support is that Most Russians in the 1890s were not wealthy.

What was the passage about?

The passage is known to tell more about the difference in sugar production output of both the Russians and those of the English.

Conclusively, The inference that the passage best support is that a lot of Russians in the 1890s were not wealthy and as such  had low output in terms of sugar production.

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Why won't Caesar change his mind?

SELECT AN ANSWER

The soothsayer forbid Caesar from

reversing his decisions, regardless of the

requests of others.

Caesar said the North Star told him he

could not change his mind, and the stars

guide people's decisions

Caesar says only women change their

minds, so he cannot change his, or he

would be unfit to rule.

Caesar is the one who banished Cimber's

brother in the first place, and to change

his mind would be admitting he was

wrong.

Answers

Final answer:

Caesar won't change his mind because in Shakespeare's play, he compares himself to the North Star, symbolizing his unchanging, constant nature as a leader.

Explanation:

The reason Caesar won't change his mind is related to his portrayal as a resolute and steadfast leader, one who sees decisiveness as a critical trait of leadership. This is epitomized in the line from William Shakespeare's Julius Caesar, where Caesar compares himself to the North Star, stating 'But I am constant as the Northern Star,' indicating that like the North Star, he is steadfast and does not waver. Shakespeare uses this metaphor to illustrate Caesar's perception of his role as a leader as fixed and unchangeable. It also reflects a belief in the importance of consistency in character and action, especially in positions of power. Thus, to change his mind would be to betray these principles and show weakness.

In scholarly or research work, how is the credibility of the writing usually proven? (site 1)

Answers

Answer:

To determine the credibility of an academic writing one has to take some steps, this include:

1. Checking the credentials and the affiliations of the writer from the written paper. This will allows you to know if the author has an authority by means of his qualifications to write on a particular topic.

2. Checking out the other papers that the author has written in related topic.

3. Ensuring that the work is plagiarism free by checking to see if the work was properly peer reviewed.

4. Checking the sources that the author used in his work to see if all sources are properly referenced.

Explanation:

A scholarly (or academic) article's author will typically list his or her credentials or affiliations. References will also be provided (footnotes, endnotes, etc.). Use a suitable article database search to determine if the author has authored any additional articles on this subject.

What In scholarly or research work writing usually?

Checking the qualifications and affiliations of the writer from the written paper is one of the measures that must be taken in order to assess the reliability of an academic work. You can determine if the author is qualified to write about a particular subject by looking at his credentials.

Examining the author's previous works on comparable subjects. Confirming that the work was appropriately peer-reviewed and that it is free of plagiarism.

Therefore, it is important to verify that the author properly cited all the sources he used in his writing.

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Which social movement stemmed from the Seneca Falls Convention of 1848?
the abolitionist movement
the public education movement
the women's rights movement
the temperance movement

Answers

Answer:

C

Explanation:

Answer:

C: the women’s rights movement

Explanation:

Give me an example sentence of first person point of view

Answers

I was walking down the street Saturday morning

Answer:

"I am answering this question"

" "Shut up!" I told him"

"I had a very good day"

This sentence is written in the indicative mood. How might it be rewritten into the interrogative mood? A) Don't slouch on that cushioned seat, dear cat! B) Will the cat slouch on that cushioned seat all day? C) The cat might slouch on that cushioned seat on all day. D) If the cat slouches on that cushioned seat all day, he will never eat.

Answers

Answer:

B. Will the cat slouch on that cushioned seat all day?

Explanation:

To interrogate means to ask questions of someone closely, aggressively, or formally.

The question mark at the end of the sentence indicates that this is a question, not a statement or exclamation. Therefore, the answer is B.

Failure to document information properly results in

A) vested interest
B) plagiarism
C) jail time
D) bias

Answers

If you don't document the information properly it's considered plagiarism and can end in jail time.

Answer:

B) Plagiarism

Explanation:

Plagiarism results from taking others work and not properly/correctly giving the credit to the person you received it from. While not properly documenting information (plagiarism) is serious it will not result in jail time, bias or vested interest.

In the story "The Most Dangerous Game." General Zaroff is the character foil for
Whitney
Rainsford
Ivan
Nielsen

Answers

Answer:

Rainsford :)

Explanation:

The character foil that is employed for representing General Zaroff would be:

B). Rainsford

The term "character foil" is used to denote a character who primarily functions to exhibit the traits or qualities directly in opposition to the traits/qualities of another character. In the text titled "The Most Dangerous Game," the character foil of General Zaroff is Rainsford as he possesses entirely opposite qualities as of Zaroff. This clash of qualities results in the development of rivalry and conflict between the two.

Thus, option B is the correct answer.

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Read the paragraph from "A Cat Is Not a Can of Soup," and observe the boldfaced evidence to support the main argument.

Have you been thinking of getting a pet? Wait a minute before you rush down to a pet shop. Adopting a pet from the Ferndale Shelter is often a wiser move than buying one. However, many families hesitate to visit the shelter because they aren't aware of its advantages or have mistaken ideas about what they will find there.

The main argument is that adopting a pet from the Ferndale Shelter is often a wiser move than buying one.

Which answer best uses the evidence to evaluate the main argument?


The argument is ineffective; the evidence presents an invalid argument.


The argument is effective; the evidence explains why more families do not explore shelter adoption.

The argument is effective; the evidence presents a valid argument.


The argument is ineffective; the evidence explains why more families do not explore shelter adoption.

Answers

Answer:

The argument is effective; the evidence presents a valid argument.

Explanation:

this was the right answer for me

The text is divided into sections with subheadings. In the section called “Inherited Disorder,” what does the author describe?

Answers

Final answer:

The section 'Inherited Disorder' describes genetically-inherited human diseases, chromosomal abnormalities during meiosis, and the dramatic effects of these disorders. It also touches on ethical and social issues related to genetic disorders.

Explanation:

In the section titled “Inherited Disorder,” the author describes genetically-inherited human diseases. This includes diseases such as sickle cell anemia, alkaptonuria, hemophilia, color blindness, and Huntington's disease. Specifically, the text details how inherited disorders can originate from abnormal behaviors of chromosomes during meiosis, with a focus on two categories: abnormalities in chromosome number and chromosome structural rearrangements. These chromosomal disorders often have significant, sometimes fatal, consequences due to the fact that small chromosome segments may contain many genes. Additionally, the section may cover the ethical, social, and medical issues surrounding genetic disorders, such as the right to privacy and concerns about genetic testing.

Read the excerpt from Echo Narcissus.

Until this day, Echo's voice can be heard in the canyons of the mountains, echoing after the voices of those who pass by — "Hello … hello … Can you hear me? … hear me, hear me, hear me" with ringing tones that quickly fade.

Which mythical element is best represented in this excerpt?

A. an explanation of the natural world
B. the appearance of nonhuman gods
C. a presence of magical elements
D. a lesson about the meaning of life

Answers

Answer:

I believe the answer is A. It's the Greek's interpretation of how echo's occur.

Answer:

A

Explanation: my mom said it was  A

Night:
Explain the quote “our eyes were opened,but too late” Where was the train at this point?

Answers

Answer:

they finally realized what was happening to them. They realized all Moshe had told them was true and had they maybe continued to keep their eyes closed that their lives would not get any worse then they had been over the last few days. The train was now on the Czechoslovakian border in a small town named Kaschau

or

They weren't expecting to be taken out of Hungary into Germany and now it was too late to save themselves

Final answer:

The quote represents a moment of realization that comes too late to change the course of events, a common theme in literature that underscores the tragic timing between awareness and action.

Explanation:

The quote “our eyes were opened, but too late” reflects a moment of realization and understanding that arrives after the opportunity to act or change the course of events has passed. This notion is a common theme in literature, symbolizing missed opportunities or delayed awareness that leads to unavoidable consequences.

While the specific context of where the train was at this point is not provided in the excerpts, this idea often occurs in narratives at pivotal moments where characters recognize the gravity of their situation, but find themselves powerless to alter their path. This can serve as a powerful commentary on human nature, destiny, and the sometimes tragic timing of awareness and action.

Which statement best explains how the evidence of this excerpt leads to the inference that the men had intercepted a very important message?

A.The inference is supported by the fact that the men had to work very slowly to decipher the complicated message.
B.The inference is supported by the complicated codes that were used by the Germans to convey their messages across the Atlantic during the war.
C.The inference is supported by the fact that two men were involved in the deciphering of the message.
D.The inference is supported by the excitement the men feel when they discover that the message was sent by Zimmermann, the German foreign secretary.


will give BRAINLIEST if correct

Answers

Its D






Explanation :took on edge and got it correct

The inference is supported by the excitement the men feel when they discover that the message was sent by Zimmermann, the German foreign secretary. Therefore, the correct option is option D.

An excerpt is indeed a quotation from that other resource that the author introduces with fresh language in a sentence. This phrase is taken from Thomas Jefferson's 1801 inaugural speech: As he warned his audience, "I may often go wrong by defect of judgement," Jefferson admitted the fallibility of human nature. "I shall frequently err through lack of judgement" is the excerpt.

This is a brief passage from a lengthy work, hence being an excerpt first from Declaration of Independence: "When it comes to necessary for one nation to cut the political ties that have bound them to another, and also to assume among powers of the world," says the philosopher Aristotle. The inference is supported by the excitement the men feel when they discover that the message was sent by Zimmermann, the German foreign secretary.

Therefore, the correct option is option D.

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Directions: Select ALL the correct answers.
Which two sentences from the passage best support the article's conclusion that sled dogs are a distinct breed?
Interestingly, this continual out-crossing for athletic enhancement has still led to the
Alaskan sled dog repeatedly producing its own unique genetic signature.
Their findings confirmed that the Alaskan sled dog has a unique molecular signature
and that the genetic profile is sufficient for identifying dogs bred for sprint versus
distance
Consequently, the animals that Huson and others in her sport assemble as a team can
be dissimilar in appearance.
Over the past 50 years, sled-dog racing has become a high performance sport that
has influenced the kind of dog that is harnessed into a team.
Canine performance research is instructive in gaining genomic insights about
metabolic systems important for muscle rehabilitation, which could help people
suffering from physically disabling diseases or traumatic injuries.

Answers

Answer:

Interestingly, this continual out-crossing for athletic enhancement has still led to the Alaskan sled dog repeatedly producing its own unique genetic signature.

Their findings confirmed that the Alaskan sled dog has a unique molecular signature and that the genetic profile is sufficient for identifying dogs bred for sprint versus distance.

Explanation:

Final answer:

The two sentences that support the conclusion that sled dogs are a distinct breed are those mentioning the unique genetic signature of Alaskan sled dogs and the ability to genetically identify dogs bred for different racing purposes.

Explanation:

From the provided passage, two sentences that best support the article's conclusion that sled dogs are a distinct breed are:

"Interestingly, this continual out-crossing for athletic enhancement has still led to the Alaskan sled dog repeatedly producing its own unique genetic signature."

"Their findings confirmed that the Alaskan sled dog has a unique molecular signature and that the genetic profile is sufficient for identifying dogs bred for sprint versus distance."

These sentences highlight the genetic uniqueness of Alaskan sled dogs despite the wide variation in their appearance due to selective breeding practices, affirming their status as a distinct breed particularly adapted for sled racing.

What do readers learn about Tom Sawyer from the list of items that the boys give to him in lines 102–115? Cite evidence from the text to support your answer. PLEASE HELP. GIVING BRAINLIEST.

Answers

Answer:

Tom likes things that are unusual though not

necessarily valuable: "a dead rat and a string to swing it with" (lines 104-105)

King uses repetition to emphasize the need to

Read the excerpt from Martin Luther King Jr's "I Have a

Dream" speech

But we refuse to believe that the bank of justice is

bankrupt. We refuse to believe that there are insufficient

funds in the great vaults of opportunity of this nation,

O have a sense of humor,

O take a firm stand.

O ask questions

O feel regret

a

nd return

Save and Exit

Nex

Subut

What is the answer

Answers

Answer:

Take a firm stand

Explanation:

Answer: take a firm stand

Explanation:

Your friends are debating whether cats are weird or not. Pick a side and your favorite arguments from the Frontier source supporting your opinion. Write one to two paragraphs presenting your arguments, and support them with quotes and details from the video. Also be sure to include at least one argument from someone that might not agree with you. Use facts to address that argument and explain why you think it might be wrong

Answers

Answer:

i think cats are weird,

Explanation:

i think this because cats aren't as lovable

they aren't playful as much as dog

they are very independent

they are very moody

add more detail, i gave some ideas

Answer:

Cats Are weird

Explanation:

1. they like to be left alone

2. dont like attention

3. are very fisty

4. dont like water

5. hate going for walks

6. scratch you

7. look ugly

8. not very loving

10. hate to cuddle or play with you

Match each excerpt to the point of view it uses

Answers

Answer:

write the excerpts that you need

How does the poet’s use of puns, or words with multiple interpretations, contribute to the poem’s meaning?

How does the poet’s use of puns, or words with multiple interpretations, contribute to the poem’s meaning?

Answers

Answer:

more details and its vocals

Explanation:

please help its due tomorrow and answer all plz

Answers

Answer:

May u resend the picture because i would love to help but i cant see the question

According to the frame narrative, which pilgrim tells the first tale?
A the host
B theknight
C the prioress
D the scholar

Answers

He is going to tell about each one according to his/her station in life. The knight is first because he is of nobility.

Answer:

B) the knight

Explanation:

Emotional responses and intellectual reasoning are similar reactions to propaganda.

True
False

Answers

Is the answer true bc it can’t be false

Answer:

False

Explanation:

Please mark brainliest I am trying to level up. Have a nice day!

2. How might scientists in the laboratory be helping farmers grow food?​

Answers

The results suggest that meat could require more energy than lab meat. But agreed lab meat would require less land, less water and potentially produce less greenhouse gases.


English, 16.04.2020 17:32, Fatimaneedhelp
In the text, the author describes how experts have learned about the vocabularies of writers by studying their written work. What else do you think experts can learn from studying the language of written work?What do you think is the value of studying the language of William Shakespeare whose writing is of
over hundreds of years old?

Answers

Answer:

The value of studying Shakespeare are the learning benefits and increase in the comprehension of the English language.

Explanation:

Other Questions
Austin Fisher contributed land, inventory, and $34,000 cash to a partnership. The land had a book value of $70,000 and a market value of $127,000. The inventory had a book value of $62,000 and a market value of $57,700. The partnership also assumed a $50,000 note payable owed by Fisher that was used originally to purchase the land. Provide the journal entry for Fisher. Meiji Isetan Corp. of Japan has two regional divisions with headquarters in Osaka and Yokohama. Selected data on the two divisions follow: Division Osaka Yokohama Sales $ 10,700,000 $ 37,000,000 Net operating income $ 749,000 $ 3,330,000 Average operating assets $ 2,675,000 $ 18,500,000 For each division, compute the return on investment (ROI) in terms of margin and turnover. During cellular respiration, oxygen is used to break down glucose molecules into carbon dioxide, water, and What is the amount of heat required to raise the temperature of 200.0 g of aluminum by 10C? (specific heatof aluminum = 0.21 cal/gC)4,200 cal420 cal42, 00 cal420,000 cal Consider a venture with a small hole drilled in the side of the throat. This hole is connected via a tube to a closed reservoir. The purpose of the venture is to create vacuum in the reservoir when the venture is placed in an airstream. (The vacuum is defined as the pressure difference below the outside ambient pressure.) The venture has a throat to inlet area ratio of 0.85. Calculate the maximum vacuum obtainable in the reservoir when the venturi is placed in an airstream of 90 m/s at standard sea level conditions. Which event of the 1920s symbolized a conflict between traditional beliefs and science?Election of herbert hoover Palmer raids scopes monkey trial stock market crash 1-a. Assume that Andretti Company has sufficient capacity to produce 120,150 Daks each year without any increase in fixed manufacturing overhead costs. The company could increase its unit sales by 35% above the present 89,000 units each year if it were willing to increase the fixed selling expenses by $140,000. What is the financial advantage (disadvantage) of investing an additional $140,000 in fixed selling expenses? I dont understand my homework... and dont go at me Im an slow learner I never done this... before... but NOTE I already got the first one... When a golfer tees off, the head of her golf club which has a mass of 152 g is traveling 44.8 m/s just before it strikes a 46.0 g golf ball at rest on a tee. Immediately after the collision, the club head continues to travel in the same direction but at a reduced speed of 27.7 m/s. Neglect the mass of the club handle and determine the speed of the golf ball just after impact. what are the three most important things to know about china The process of dna replicaton occurs just before the specification for a plastic handle calls for a length of 6.0 inches +- .2 inches. The standard deviation of the process is estimated to be 0.05 Inches. what are the upper and lower specification limits for this product. Suppose that preferences over private consumption C and public goods G are such that these two goods are perfect substitutes, that is, the marginal rate of substitution of public goods for private goods is a constant b > 0. Determine the optimal quantity of public goods that the government should provide, and interpret your results. Make sure you show all of the relevant cases. What happens when b changes, or when q changes?Repeat part (a), except with perfect complements preferences, that is, for the case where the representative consumer always wishes to consume private consumption goods and public goods in fixed proportions, or C = aG, with a > 0. If half of the pie below is eaten, what fraction remains? PLZZZZZZZZZ HELPPPPPPPPPRead the excerpt from "Pirate Story" by Robert Louis Stevenson.Three of us afloat in the meadow by the swing,Three of us aboard in the basket on the lea.Winds are in the air, they are blowing in the spring,And waves are on the meadow like the waves there are at sea.Adventure and imagination are exciting for children. This is a theme found in these lines.How does repetition strengthen the theme of adventure and imagination?The repeated words discourage action and play.The repeated words express movement and travel.The repeated words are numbers and scientific terms.The repeated words warn of danger and harm. g write a program which will take a list of integer number from the user as input and find the maximum and minimum number from the list. first, ask the user for the size of the array and then populate the array. create two user define functions for finding the minimum and maximum numbers from the array. finally, you need to print the entire list along with the max and min numbers. you have to use arrays and user-define functions for the problem. Which popular style has the simplest melodies and harmonies?rock and rollexpressionismjazzscat Josephines father is 5 times as old as Josephine. In 6 years, he will be only three times as old. How old is Josephine now? Brandon bought four packs of dog treats he gave for treats to his neighbor's dog now Brandon has 24 treats left for his dog how many dog treats were in each pack explain how you know Lindsay is 555 years younger than Mark. Seven years ago, the sum of their ages was 313131. Let lll be Lindsay's age and let mmm be Mark's age. Which system of equations represents this situation?