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sat essay
assignment:should people always prefer new things, ideas, or values to those of the past? Should people always prefer new thing to the old? Many people argue that we should not accept the new easily and should sick to the old. As far as I am concerned, we must always try our b...
social studies
human resources includes the skills,talents and abilities which individuals possess.a variety of human resources exists in the Caribbean such as engineers,doctors,lawyers,teachers,scientists,farmers,authors,poets,artists,fisherman and sport personalities
science
Why would it be helpful for scientists to know how long animals live?
geography
I can't find any of the answers in the book, could you please help? 1. The landform occupying the center of the triangle that forms the indian subcontinent is the.. A Deccan Plateau B Western Ghats C Indo- Cangetic Plain D Eastern Ghats 2. Which account of an Azerbaijani d...
Repost- Biology
A scientist separates plant pigments from leaf, root, and stem samples by paper chromatography. All the leaf chromatographs include yellow green and blue green spots but none of the root and only a few of the stem chromatographs have these green spots. Many of the samples have...
Science
Respected teachers, I have got assignment that i have to write about 7 scientists i am in class 6 and we have to write 1 page for 1 scientist we have to write about their life style and what they invented and how they were great and i know names of some scientists .... Albert ...
Biology
A scientist separates plant pigments from leaf, root, and stem samples by paper chromatography. All the leaf chromatographs include yellow green and blue green spots but none of the root and only a few of the stem chromatographs have these green spots. Many of the samples have...
Enchancing Children's Self-Esteem
Please check to make sure my answers are correct. 1. Its important to help children develop positive self-esteem because A. it will help them be more successful at their careers later in life. B. theyll be more likely to question authority, when necessary. C. they&...
Writing I
Label each sentence below. Use S for simple, CD for compound, CX for complex, and CD-CX for compound-complex. 1. Do you know the theory of black holes? 2. Objects in space have gravitational pull, so smaller objects are attracted to larger object. 3. Throw a rock into the air,...
Literature
In reply to my past post-- On the third of December on the Cornish coast of England many years ago, the weather changed overnight from a mild autumn to a cold, harsh winter. Nat Hocken, a worker at a farm noticed that the birds appear more restless than usual and told his wife...
Literature
'Du Maurier, who wrote the short story The Birds, tells us that the birds are trying to destroy human life, but we never know what is making them do it. Is it really the weather, as some characters in the story think? Is it an evil force? Suppose you're a historian at ...
scientist
A techer pushed a 98 newton desk across a floor for a distance of 5 meters she exerted a horizontal force of 20 newtons. how much work was done?
scientist
Mrs. leuenberger ran the same marathon but since her husband was hunting and she couldnt find a babysitter she had to carry her two daughters in her arms they weigh 40pounds and 55pounds Mrs Leuenberger weighs 145 pound (but you didnt hear that from me)How much work and power ...
scientist
Mr.Becks gigantic gas- guzzling exhaust spewing urban assault vehicle suburban weighs 10000 pounds it takes Mr Beck 2 minutes to drive 1.5 kilometers to west valley fitness so he can ride the stationary exercise bike for a half hour How much work and power did the suburban do?...
Technology
is there anything i should add to my answer: 1. There are seven inputs common to all technological systems. List these inputs and give an example of each one. There are seven inputs common to all technological systems. These include people, materials, tools (machines), energy,...
chemistry
Why is rate of reaction important to scientists?
science
on what website do you find the biography of a latin american inventor or scientist?
scientist
how do scientists keep ice fossils frozen?
Physics (Please)
I'm confused and am hoping someone could help me understand energy can neither be created nor destroyed... great... so in physics classes we can set up problems and stuff were KEo + PEo = KE + PE Energy intial equals energy final sense energy is conserved but then when fri...
AP BIO
a scientist plans to use a microtome to cut sections of a particular type of tissue so then that typical cell will be cut into about 20 sections. to help him make careful observation of internal cell structures, he considers staining the sections with a dye. which of the follo...
scientist
classify properties as chemical or physical for gold?
Science
Are there scientists studying the population of organisms? If there is, what are they called?
Grammar and Composition
please check these: tell which is the correct word in each of the sentences. 1. Sarah had to (wait/weight) at the airport all night. wait 2. What are you going to (ware/wear/where) to the party tonight? wear 3. You don't have to have (your/you're) own way with everythi...
science
What element, found in all plants and animals, is used by scientists to determine approximate dates for an artifacts age?
Science
14 letter word for "scientists do their experiments more than once so they can reduce the effects of chance errors. This is called conducting _________
scientist
what r the 6 step of the scientific method
Scientists
Information on Julie Morgan
Biology
1. A famous scientist once said that wherever in the universe life exists, some of those life-forms must be colored. Why would the scientist make such a statement? 2. One of the accessory pigments used in photosynthesis is beta-carotene, a carotenoid found in high concentratio...
science
is a news article the same as a news story is this a news article or a news story? Is Garbage The Solution To Tackling Climate Change? ScienceDaily (Oct. 3, 2009) Converting the rubbish that fills the worlds landfills into biofuel may be the answer to both the gro...
science
I have two questions. I'm doing a crossword puzzle and this is the question. "sometimes scientist make a mistake or ___and need to do the experiment again." The answer is 5 letters and the second to last letter is an O. The second question is "After the expe...
scientist
Scientists do their experimental tests more than once, so they can reduce the effects of chance errors. This is called conducting______________. I need help with this one.
science 4th grade
why do scientist predict?
reading/english
When studying the world of living things, biologists and other scientists use the scientific process. Observtions along with precious data are used to formulate a hypothesis. New observations and or experiments are carried out in order to test the hypothesis. Scientists often ...
Chemistry
A scientist wants to make a solution of tribasic sodium phosphate, Na_3PO_4, for a laboratory experiment. How many grams of Na_3PO_4 will be needed to produce 375 mL of a solution that has a concentration of Na^+ ions of 1.10M? I tried multiplying .375 L by 1.10 M to get the n...
social studies
many scientists believe that______began in africaover 2 million years ago
4th grade science
how do scientist preserve fossils frozen in ice
Science
how do scientists preserve a fossil frozen in ice
Science
There are two fill-in-the-blank questions that I can't find the missing word. If you could be of any help, I'd appreciate it. :) #1. The ____ describes the steps you use during an experiment. #2. Sometimes scientists make a mistake, or ____, and need to do an experimen...
science
sometimes scientists make a mistake or ? and need to repeat the experiment again.
science
1) what are five skills scientist use to learn about the world? 2) what are inferences based on? 3) why do scientist make models? ¢¾¢¾plz, plz help me.... i totally need help on this¢¾¢¾
scientist
The shark can accelerate to a speed of 32.0 km/h in a few seconds. Assume that it takes a shark 1.5 s to accelerate uniformly from 2.8 km/h to 32.0 km/h. What is the magnitude of the shark's acceleration?
scientist
suppose a polar bear running with an initial speed of 4.0 m/s accelerates uniformly for 18s. what is the bear's maximum speed if the bear travels 135m during the 18s of acceleration? Give the answer in both meters per second and kilometers per hour.
Science
Scientists do their experimental tests more than once, so the can reduce the effects of chance errors. This is called conducting___________________.
science
Scientist do experimental tests more than once so they can reduce the chance of errors. This is called conducting what?
history
plz check. thanks Compare and contrast the short and long- term effects of the Crusades on Western Europe and the Middle East. Western Europe: The series of military expeditions, spanning more than a hundred years, began with Pope Urban II to take back the Holy Land from Musli...
scientist
In 1976 a powerful earthquake hit the city of Tangshan, China. Scientists had failed to predict the earthquake. If people had paid attention to the unusual animal behavior that preceded the earthquake, however, they would have known it was coming. Animals can often sense an im...
science
When scientist do their experimental test more than once so they can reduce the effects of chance errors what is this called in one word?
biology
What are three points of evidence that scientists used to develp the three-domain system?
6th grade
How does a scientist choose which type of investigation to use?
science
scientist do test more than once to reduce chance errors which is called conducting what
Physics
(a) Identify the significance of scientists James Clerk in hertzs research. (b) Explain the physics of why hertz was able to detect sparkling in small detector coil when the detector was located in the position shown on the diagram above. (c) Describe two tests Hertz car...
Biology
Read Scientific Inquiry, Controlled Experiments Then and Now, pages 6-7 of your textbook. Start by observing the living species around you. Ever wonder why a pollinator is attracted to a particular flower, or what would happen to predator species if a particular prey species i...
biology
Read Scientific Inquiry, Controlled Experiments Then and Now, pages 6-7 of your textbook. Start by observing the living species around you. Ever wonder why a pollinator is attracted to a particular flower, or what would happen to predator species if a particular prey species ...
science
14 letter word scientists do their experimental tests more than once so hey can reduce the effects of chance errors. This is called conducting ______________.
environmental science
Please check this: Scientists use statistics to a. graph data b. analyze data c. communicate ideas to each other d. all of the above B ( in my book it says: scientists rely on and use statistics to summarize, characterize, analyze, and compare data. statistics is usually a bra...
Science
Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in run...
Intro to Psychiology 1
It is the proper role of a psychological research scientist to: A) Question data B) make safe predictions C) Keep research methods accessible only to those involved in the research D) Avoid making predictions. I know it's not (B) and i dont think it's (D) either. I'...
scientist
Scientists do their experimental tests more than once so they can reduce the effects of chance errors this called conducting__________?
science
i've got a question that i need help on what problems could occur if scientists didn't communicate the results of their investigations
economics
Discuss similarities and differences in the roles economists play as policy advisors and as scientists. How would advice offered to policymakers differ depending on which role an economist assumes?
science
how do scientists use measuremnets?
science
how do scientists use the si system?
chemistry
A scientist has 0.46 mL of a solution. How would she convert this volume to microliters?
calculus
Carbon-14 is a radioactive substance produced in the Earth's atmosphere and then absorbed by plants and animals on the surface of the earth. It has a half-life (the time it takes for half the amount of a sample to decay) of approximately 5730 years. Using this known piece ...
biology
Describe the dilemma posed by the taxon representing the protostome to scientists studying systematics in animal kingdom
10th grade English
Well, it is not quite English.. But it is an essay on my science project. I was wondering if I could get some help on grammar or awkward phrases. Please fix any mistakes in it ASAP.. Asthma, a multi-factorial disease, is caused by family heredity, which is, passed on from one ...
scientist
who was the greatest 20th century scientist?
scientist
What element, found in all plants and animals, is used by scientists to determine approximate dates for an artifacts age?
Biology
Read Scientific Inquiry, Controlled Experiments Then and Now, pages 6-7 of your textbook. Start by observing the living species around you. Ever wonder why a pollinator is attracted to a particular flower, or what would happen to predator species if a particular prey species i...
Critical Thinking
In 1976 a powerful earthquake hit the city of Tangshan, China. Scientists had failed to predict the earthquake. If people had paid attention to the unusual animal behavior that preceded the earthquake, however, they would have known it was coming. Animals can often sense an im...
Science
How does Marie Curie help us understand the universe in which we live? Would this be correct?? With numerous experiments Marie confirmed Becquerel's observations that the electrical effects of uranium rays are constant, regardless of whether the uranium was solid or pulver...
Biology
How are scientists able to piece together the process of protein synthesis and the effects of genetic controls without direct observation?
elementary
how becoming a scientist
science
why do scientists use the same enzyme to remove the insulin and cut the plasmid?
science
why do scientists use the same enzyme to remove the insulin and cut the plasmid?
Grammar
Just a quick question- Choose the answer that best identifies the phrase in CAPS: Fossil plants that scientists have identified include cactuses and oaks, and THEY ARE PRESERVED IN BREATHTAKING DETAIL. A.adj. clause B.adverb clause C.noun clause D.independant clause D? Thanks!...
Grammar
The last four grammar questions of the day [I think]- idenify the word that the phrase in CAPS modifies: 1.A scientist WHO FINDS ONE NEW SPECIES is very happy Ans- scientist 2.WHEN SOMEONE FINDS SEVERAL NEW SPECIES AT ONCE, that is rare indeed Ans- rare?? 3.Only a few plants, ...
Grammar
I have a few more grammar questions, can someone please help me find the answer? Choose the answer that best identifies the phrase in CAPS. 1.These flower fossils, WHICH CAME FROM A VACANT LOT, are the best that have ever been discovered anywhere in the world. A.adjective clau...
Grammar
I need help on some of these questions: Identify the independant clause in the sentence: 1.Scientists have found traces of an ancient forest that once grew on an empty lot in New Jersey when the region had a tropical climate. A.on an empty lot in New Jersey B.Scientists have f...
English
In 1976 a powerful earthquake hit the city of Tangshan, China. Scientists had failed to predict the earthquake. If people had paid attention to the unusual animal behavior that preceded the earthquake, however, they would have known it was coming. Animals can often sense an i...
trig
Scientists believe that the average temperature at various places on Earth vary from cooler to warmer over thousands of years of gradual climate change. Suppose that at one place, the highest avg temp is 80 and the lowest is 60. Also suppose that the time it takes to go from t...
Math riddle
What is one problem That Rocket Scientist, Dr. Awkward, never has?
English
I am having trouble writing a topical outline and expanding it to a sentence for this paper: Marie Curie is best known as the discoverer of the radioactive elements polonium and radium, and is the first person to earn the honor of two Nobel prizes. Her work not only influenced...
Science
How do scientists know what the interior of the earth looks like when we have never seen it?
Science
How do scientists map the bottom of the ocean when they cannot travel there to see it?
Science
I have to do a project with a science related career (that doesn't necessarily mean a scientist, but someone who uses science frequently). What do you call a scientist who studies the science of music? I've google this but I couldn't find any results, but I know th...
Science
Can you please help me find a list of scientists that have something to do with energy? (They don't have to be famous.) Thank You!
Science
A scientist needs to take a picture of the well-ordered arrangements of the atoms and molecules within a substance. What instrument would be best for a scientist to use?
science
ok i have a couple questions. 1. How has life changed throughout Earth's history? 2.What are three things that fossils tell us about earth's past? 3.What is radioactive dating? how do scientists use parent and daughter elements to determine the age of a fossil? 4.What ...
science
Scientists believe that Earth's early atmosphere changed in composition as a result of a. the appearance of oxygen-producing organisms b. the drifting of the continents c. the changes in Earth's magnetic field d. a transfer of gases from the Sun
science
according to scientific hypothesis, how were earth's oceans formed? when do scientists hypothesiz they formed?
Science help
India : Duck Australia : Duck South Africa : Duck, Goose Africa : Duck Cat Antarctica: Duck Goose cat If scientist wanted to argue that South Africa, Africa, and Antarctica was once connected, which animals would they use to determine that? Would it be just Goose and Cat? Sinc...
science
India : Duck Australia : Duck South Africa : Duck, Goose Africa : Duck Cat Antarctica: Duck Goose If scientist wanted to argue that South Africa, Africa, and Antarctica was once connected, which animals would they use to determine that? Would it be just Goose and Cat? Since d...
us history
1. during the 1950 americans placed the most value in a. comfort and security. b security and cauton. c. adventure and excitment. d. rock and roll and nigth. answer d. 2. one of president truman greatest challenges in reconverting to a peacetime economy was a. securing passage...
WORLD HISTORY
What element, found in all plants and animals, is used by scientists to determine approximate dates for an artifacts age?
english
Are these sentence types correct? Complex While scientists are studying past diseases such as the Spanish flu, they constantly worry about the next pandemic to strike. Compound Various research facilities, such as the World Health Organization, are continually studying various...
Math
To chart the movement of a polar bear, scientists attached a radio transmitter to its neck. Two tracking stations are monitoring the radio signals from the bear. Station B is 10 miles directly east of station A. On Monday, station A measured the direction to the bear at N43E,a...
Physical Science
I had a couple of questions for homework and I answered them the best I could. Can someone check and tell me if they are correct? 1.To describe the position of an object accurately, scientists use what? Ans- Coordinate Systems 2.In science, we have to describe the motion of an...
Physical Science [repost]
I had a couple of questions for homework and I answered them the best I could. Can someone check and tell me if they are correct? 1.To describe the position of an object accurately, scientists use what? Ans- Coordinate Systems 2.In science, we have to describe the motion of an...
Physical Science
I had a couple of questions for homework and I answered them the best I could. Can someone check and tell me if they are correct? 1.To describe the position of an object accurately, scientists use what? Ans- Coordinate Systems 2.In science, we have to describe the motion of an...
maths
there are 24 hours in a day and scientists tell us that we should sleep for 3/8 of the day.how much time should we spend sleeping?
SAT Essay
Reposting. Think carefully about the issue presented in the following excerpt and the assignment below. The history of human achievement is filled with stories of people who persevere, refusing to give up in the struggle to meet their goals. Artists and scientists, for instanc...
SAT Essay
Think carefully about the issue presented in the following excerpt and the assignment below. The history of human achievement is filled with stories of people who persevere, refusing to give up in the struggle to meet their goals. Artists and scientists, for instance, may stru...
science
A scientist wishes to determine how effective a vaccine is in protecting rats against a contagious disease. Which experimental procedure should the scientist use to determine the vaccines effectiveness?
bio
Scientists often want to know if the genetically transformed organism can pass its new traits on to its offspring and future generations. To get this information, which would be a better candidate for your investigation, an organism in which each new generation develops and re...
fb
what were the headlines after a mad scientist trained two eggs to attack a candy store with sharp sticks
algebra I
what where the headlines after a mad scientist trained two eggs to attack a candy store with sharp sticks Pg 161-162
genology
How does a scientist tell if a valcanoe is active or inactive and what is the criteria
Social Studies Opinion
What do you think about this aricle? Can I get some of your ideas? Indoctrinated in belief The statistics in "Darwin's sin" (Feb. 8), which indicate only half of Americans believe in evolution, are sad. Evolution is proven based on fact, scientific study and evid...
social studies
Scientists think adding CO2 to the atmosphere will affect the earth's climate. What effect is predicted?
Chemistry
Sorry about that The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000...
Chemistry
The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000 times. A basic s...
Chemistry
The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000 times. A basic s...
Foreign Langauge
Who is a person that's important to the history and/or culture of France. This person can be a political figure, scientist, artist, musician, athlete, religious figure, etc.
m
what were the headlines after a mad scientist trained two eggs to a candy store with sharp sticks
Physics
please check these: In which of the following sentences is WORK used in the scientific sense of the word? a. holding a heavy box requires a lot of work b. a scientist works on an experiment in the laboratory c. sam and rachel pushed hard, but they could do no work on the car d...
Chemistry
A scientist has 0.46mL of a solution. How would she convert this volume to microliters?
science
When determining teh mass of an atom, the electrons are not considered. Why can scientists disregard the electrons?
Physics
please check my answers, they are Capitalized 1. the SI base unite used to measure mass is the a. meter b. second. C. kilogram d. liter 2. how does a scientist reudce the frequency of human error and minimize a lack of accuracy? a. take repeated measurements b. use the same me...
science245
Scientists debate about the use of fossils as a tool to determine records of various events, such as the vanishing of the dinosaurs or the origin of our ancestors. Based on what you know of fossils from your textbook and other sources, discuss the role of fossils in helping sc...
Science
Scientists theorize that an increase in atmospheric carbon dioxide level might cause an increase in global temperatures. This theory is based on the fact that carbon dioxide is a. good absorber of infrared radiation b. poor absorber of infrared radiation c. good reflector of u...
critical thinking
In 1976 a powerful earthquake hit the city of Tangshan, China. Scientists had failed to predict the earthquake. If people had paid attention to the unusual animal behavior that preceded the earthquake, however, they would have known it was coming. Animals can often sense an im...
Science
How would carbon-14 help scientists determine the earliest explorers of the new world?
science
Hello! I need help with some Science things. 1. Where is a good place to find a picture that describes radioactive decay, fussion and fission/ 4. Scientists use the amount of radioactive isotopes found in rocks and fossils to calculate their ages. This process is called_____ 5...
math
what were the headlines after a mad scientist trained two eggs to attack a candy store with sharp sticks?
Translation exam (from French into English)
Hello! I'm a French-speaking student and I had an English exam this morning. We had to translate a text and 10 isolated sentences from French into English. This is, more or less, what I wrote for the text. What do you think of it? If you don't mind, could you correct t...
Science
What are the disadvantages of cutting down rainforests? I've already looked it up and got some info, so if anyone knows any additional info i could add to it, I'd appreciate it. Well, here's what I got: -Trees produce Oxygen and carbon dioxide -farmers CAN use the ...
sceince
1) which scientist's work did Copernicus contradict? 2) what made it difficult for him to prove his theory? i researched some site but still i dont get it...
science
1) which scientist was later imprisoned for openly supporting the Copernican theory? 2) what did he discover that helped prove that Copernicus was correct?
science
1) which scientist's work did Copernicus contradict? 2) what made it difficult for him to prove his theory?
sci
Respond to the following scenario: o Your younger brother is in 5th grade. He comes home and tells you to look at an animation his teacher showed him in geology class. o Review the Continents of the Past animation on this weeks aXcess page. o After viewing the animation,...
chem
what would cause scientists t change the current model of an atom
Science.
What did scientist learn from studying Supernova 1987A?
Science
Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of electrolytes will cond...
Geology
Scientists debate about the use of fossils as a tool to determine records of various events, such as the vanishing of the dinosaurs or the origin of our ancestors. Based on what you know of fossils from your textbook and other sources, discuss the role of fossils in helping sc...
chemistry
what 3 groups do scientists put elements into in the periodic table?
Evolutionary Psychology
Its the year 2234 and you are an explorer‐scientist who has been sent to a distant planet to study two intelligent life forms recently found there. One lives in the resource‐poor desert regions of the planet. Tests show this creature (a smartine) is amazingly...
6th grade Science
Scientists can use what to test an area for oil without drilling?
english: essay
Could someone give feedback on my expository essay? The concerns is the thesis, intro, conclusion and citations of the paper. Systemic Lupus Erythematosus (Lupus) Many years ago, my mother was diagnosed with Systemic Lupus Erythematosus. Every day since the diagnose she try to...
science
I have a picture that shows what scientists think parts of North America looked like 300 million yrs ago. ie, trees, plants , insects, rocks. How do scientists know what North America looked like so long ago, if there were no people around to see it?
Physics
One application of the index of refraction is analysis of crime scenes. Using the index of refraction, forensic scientists can determine what type of glass has been left at a scene. Read the following and answer the questions below. Different types of glass (bottle, window, ca...
chemistry
How do scientists know that light has a dual wave-particle nature? In what ways does light behave as wave and particle?
introtechnology
find out a female scientist and what they made
math
The scientists Verhulst (1828) where is the natural growth rate of the population when resources are limited and is a positive constant called carrying capacity of the environment. (a) Using sign analysis, find all constant solution and discuss the general behavior of solution...
math
The scientists Verhulst (1828) and Peal (1930) proposed the following growth model for a population living in an environment with limited resources (e.g. space, food, sunlight, etc): = , where is the natural growth rate of the population when resources are limited and is a pos...
math
The scientists Verhulst (1828) and Peal (1930) proposed the following growth model for a population living in an environment with limited resources (e.g. space, food, sunlight, etc): = , where is the natural growth rate of the population when resources are limited and is a pos...
English
1.Susan made small and cute teddy bears. (In this sentence, what is the meaning of 'teddy'?) 2. I like both Tom and Don. 2-1. I like Tom and Don. 2-2. I want to marry Tom or Don. 2-3. I like neither Tom nor Don. 2-4. I don't like Tom, and I don't like Don, eith...
SCIENCE NEED HELP NOW PLEASE!!!!!
Explain why scientists use the formula H2O areound the world for water rather than water all around the world?
ethinics
Questions: Do you think that "race" should have ever been constructed by social scientists? Why? Why not? Why do you think that anyone has to define who we are by standards measured by our human understanding of anthropology?
english 12
what is the thesis suppose to do analysis of this essay to show its cause effect. How do i start it ? June 15, 2001 - More than 13,000 years ago when humans first set foot in the Americas, there were no roads crisscrossing the landscape, no sprawling cities, no vast fields of ...
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