The purpose of a controlled experiment is to allow a scientist to isolate and test?

A a conclusion

B many data

C several variables

D a single variable

Answers

Answer 1
A single variable.

In an experiment we are trying to figure out how one thing (independent) effects another thing (dependent) so we want to keep everything constant. We want that experiment to be controlled so nothing else is effecting our dependent variable. That way we can be 100% sure that any change to our dependent is due to our independent variable. Hope that makes sense

Related Questions

what happens when a cold front replaces a warm front

Answers

Answer:

When a cold front overtakes a warm front, it creates what's called an occluded front that forces warm air above a frontal boundary of cooler air masses.

Explanation:

The presence of a cold front means that cold air is advancing and pushing underneath warmer air. This is because the cold air is ‘heavier,’ or denser, than the warm air. Cold air is thus replacing warm air at the surface.

Which item is a carbon sink?
O A. Soil
OB. Animal respiration
OC. Clouds
OD. Plant respiration

Answers

soil is the answer. i hope this helps!!

In which biome would you likely find primarily evergreens, such as pine, fir, and spruce?

Answers

my guess is taiga? if there are options go with the closest to that

Eating Insects to Feed the World, could mealworms be a more sustainable protein source than beef? Why?

Answers

Answer:  There is a sustainable alternative to going meat-free, the FAO says: edible insects. Grasshoppers, crickets and mealworms are rich in protein, and contain significantly higher sources of minerals such as iron, zinc, copper, and magnesium than beef.

Explanation:

Runoff from a uranium mine stockpile has contaminated the surface water in a location. This might cause health problems among people in the location. Which of these is the best plan to solve this problem? (4 points)
Plant trees around uranium mines to absorb contaminants.
Put fences around uranium mines to check the flow of contaminants.
Wear protective clothing for prevention against harmful effects of radiation.
Collect the runoffs in retention ponds for isolation and recovery of contaminants.

Answers

The best best plan to solve the problem of contamination in the surface water is to collect the runoffs in retention ponds for isolation and recovery of contaminants.

What is surface runoff?

Surface runoff is an overland flow of excess water (with or without accumulated contaminants) that cannot be absorbed by the ground as infiltration.

According to this question, runoff from a uranium mine stockpile has contaminated the surface water in a location. This might cause health problems among people in that region.

However, one way to curb the problem of contamination in the surface water is to collect the runoffs in retention ponds for isolation and recovery of contaminants.

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How does the white-tailed deer overpopulation affect the ecosystem

Answers

Answer: Too many deer in a given area results in overgrazing and the eventual loss of brush and shrubs in forested areas. Loss of undergrowth means no place for small animals and birds to shelter and nest. The result is the disappearance of many native species that no longer have access to the habitat they need.

How many chromosomes does the human genome contain?.

Answers

Forty six chromosomes

see the file attached!o(〃^▽^〃)o

How will widespread solar panels to generate electricity help reduce global warming

Answers

Answer:

Solar panels fight global warming by producing electricity that keeps us from burning greenhouse gas-producing fossil fuels. They also shade Earth from the sun.

Explanation:

What are human sources of excess nutrients (nitrates and phosphates) in streams?

Answers

Fertilizer, waste Water ,automobile,exhaust,animal waste

In a population of birds, the color of their feathers is controlled by an incompletely dominant gene. Homozygotes of one type are sky blue, homozygotes of the other type are mauve, and heterozygotes are cobalt colored. Population 1 contains 10,000 birds and 6,400 of those 10,000 are sky blue. Population 2 contains 10,000 birds and 900 of those 10,000 are sky blue. Both populations are under Hardy-Weinberg Equilibrium. Determine the HWE frequencies of each color in each population separately.

Answers

Answer:

if it contains 10000 than it must be 100373282

Explanation:

calcium iron vitamin c and vitamin d in which of these is organic substances​

Answers

Answer:

vitamin C and vitamin d

Explanation:

because if the digested first only no vitamin it's supply to our body

examples like eggs

Cross Tt x Tt what is the excepted ratio of tall to short plants?

Answers

Here is the answer...hope it helps:)

Can someone check if my answers are correct or wrong? thanks

Answers

Answer:

Your answers are correct or at least from the information I know and read super sorry if wrong but everything checks out!

A student mixes various molecules needed for DNA replication. When he adds DNA, replication occurs, but each DNA duplex consists of a normal DNA strand paired with numerous segments of DNA that are a few hundred nucleotides long. What has been left out of the mixture

Answers

Answer: DNA Ligase

Explanation:

During DNA replication, both the parental DNA strands are separated and act as templates for the synthesis of new strands. The formation of the new strands occurs in only 5'-3' direction and thus both the strands are synthesized in a different manner. One new strand with the template of 3'-5' direction will be synthesized continuously and is called a leading strand. The other strand with the template of 5'-3' direction will be synthesized discontinuously in the form of DNA fragments. These fragments are called Okazaki fragments and the strand is called a lagging strand. DNA ligase connects these fragments later to form a continuous lagging strand.

Therefore, DNA ligase is required for ligation of Okazaki fragments, and in absence of DNA ligase, the ligation of fragments will not occur and the newly synthesized strand will be discontinuous. However, if DNA ligase is not present in the reaction mixture, then the chances are that not all the newly synthesized DNA strands will be discontinuous. Only the DNA molecule with the lagging strand will be in the form of fragments.

When the body uses nonspecific immune defenses, how is the body defending itself?.

Answers

Even openings in the skin (such as the mouth and eyes) are protected by saliva, mucus, and tears

The grants witnessed strong selection during droughts in 1977 and 1985. compare the two droughts.select all that apply.select all that apply.in both droughts, large-beaked medium ground finches had the highest survival rates.in both droughts, small-beaked medium ground finches had the highest survival rates.both droughts resulted in changes to food sources that favored the survival of some medium ground finches over others.both droughts events provided strong natural selection on medium ground finch populations.

Answers

Both droughts resulted in strong natural selection on medium ground finch populations  and both droughts resulted in alteration to available food, which favored the survival of some medium ground finches over others. Thus, the correct option is A and B.

What is natural selection?

Natural selection is a natural process in which organisms that are more adapted to their environment survive and reproduce more than those that are not.

Darwin's Finches' beaks were picked for their beneficial adaptations over generations until they all branched off to become new species. These birds have distinct beaks than mainland finches, although being almost identical in every other way.

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Which led most directly to the decline of the latin language?
oa. the death of joan of arc
ob. fear of witchcraft
oc. the great schism
o d. interest in poetry

Answers

The great schism was what led to the decline of the latin language and is denoted as option C.

What is Great schism?

This was characterized by Christianity being divided into two divisions, Roman Catholic and Eastern Orthodox.

This led to the latin language being replaced with others such as Greek etc in this scenario.

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If+the+atmosphere+is+78%+n2,+why+can't+we+just+get+our+nitrogen+by+breathing?

Answers

Nitrogen is present in the environment in abundance but still we cant inhale nitrogen

What is the role of nitrogen in our body?

Nitrogen is physiologically inert. It contributes nothing to the functioning of our bodies. The cells in our body need oxygen to live, not nitrogen. we can find nitrogen in our body in form of nitrogeneous base in nucleotide.

We inhale all gases present in air fills our alveoli, by the process of diffusion, only oxygen in the air is taken into the blood stream while the other gases along with the waste CO2 is exhaled. So you do breathe in nitrogen, but it is exhaled as it is by the body.

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Energy in this ecosystem passes directly from the sun to.

Answers

Answer:

Through photosynthesis, certain organisms convert solar energy (sunlight) into chemical energy, which is then used to build carbohydrate molecules. The energy stored in the bonds to hold these molecules together is released when an organism breaks down food. Cells then use this energy to perform work, such as movement.

Explanation:

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Describe the structure and the function of the stomach. Be sure to include cells and tissues relating to this organ.

Answers

Connective tissues support the tissues of the mucosa and connect it to the muscularis layer.

The blood supply of the submucosa provides nutrients to the wall of the stomach. Nervous tissue in the submucosa monitors the contents of the stomach and controls smooth muscle contraction and secretion of digestive substances.

What is the function of the stomach?

The stomach secretes acid and enzymes that digest food. Ridges of muscle tissue called rugae line the stomach.

The stomach muscles contract periodically, churning food to enhance digestion. The pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

Thus, this could be the answer.

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A cross was performed, and the offspring shown
to the right were produced. What is the most likely
genotype for the parents?
OBbee x bbEE
OBbEEx Bbee
OBbEex BbEe
BBEE x bbee
DONE
10 mice with
black fur, black eyes
3 mice with
white fur, black eyes
2 mice with
black fur, red eyes
1 mouse with
white fur, red eyes

Answers

Answer: da

Explanation:

Answer:

c

Explanation:

Some behaviors such as mating and caring for young are genetically determined in certain species of birds. the presence of these behaviors is most likely due to the fact that

Answers

The presence of these behaviours is most likely due to the fact that these behaviours helped birds to survive in the past.

How do birds care for young ones?

Bird are the warm blooded vertebrates that has feathers, toothless beaked jaws and has the ability to reproduce their young ones through the laying of eggs.

They take care of their young ones till a certain life stage to ensure their survival.

Therefore, the presence of these behaviours is most likely due to the fact that these behaviours helped birds to survive in the past.

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A bird species known as the cattle egret is often found near farms in wet areas. The bird waits, sometimes even perched on a cow's back, until the cow kicks up a frog or fish while it walks. Then, the bird strikes and eats the exposed prey. This is an example of what kind of feeding relationship

Answers

This is commensalism because one organisms benefits (the egret) and the other is unaffected (the cow).

The interaction between a cattle egret and a cow is an example of Mutualism.

What is the Feeding relationship?

The feeding relationship may be defined as a classification of species interaction through which the organism of one species feeds on the other via interacting with it.

Mutualism is a type of +,+ relationship in which the species of a cattle egret benefitted due to the consumption of prey that is present on the cow's back, on the other hand, the cow also gets benefits by cleaning the body (back) by cattle egret.

Therefore, it is well described above.

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conclusion definition

Answers

Answer:

Answer

Explanation:

The conclusion is the last paragraph you write. The Barebones of a conclusion; summarize the previous paragraphs you wrote and conclude what you wanted to say for writing those paragraphs.

Human development may change depending upon the environment. This is because development is​

Answers

Answer:

This is because development is dynamic process.

Which type of cell transport is used by chloroplasts to make hydrogen (H*) ions move against their concentration gradient?
O A. Exocytosis
O B. Passive transport
O C. Active transport
O D. Diffusion ​

Answers

Answer:

The answer to the question is C

how did james hutton's beliefs differ from the beliefs of his time?

Answers

Hutton's ideas were diametrically opposed to much of this contemporary theory. He asserted that many rocks had indeed been formed by sedimentary processes—i.e., that rock particles had been washed off the land into the oceans, had accumulated in beds there, and had solidified into rocks.

Hope it helps!!

Charles darwin found fossils that looked like ancient versions of living species. From this evidence darwin suggested that earth was.

Answers

The fossil that was discovered by Charles Darwin goes a long way to suggest that the earth is older than 6000 years.

Who is Charles Darwin?

The man Charles Darwin is the renowned proponent of the theory of evolution. According to this theory, living things all evolved from simple life forms many years ago.

The fossil that was discovered by Charles Darwin goes a long way to suggest that the earth is older than 6000 years.

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Describe 2 causes of variation in humans

Answers

The two main causes of variation are "mutation" and "genetic recombination".

A mutation is a change in the DNA sequence of an organism. Mutations can result from errors in DNA replication during cell division, exposure to mutagens or a viral infection.

Genetic recombination refers to the rearrangement of DNA sequences by the breakage and rejoining of chromosomes or chromosome segments.

Answer:

The two main causes of variation are mutation and genetic recombination in se.xual reproduction.

Explanation:

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Which best indicates pen pressure in handwriting analysis?

The height-to-width ratio is uniform.

The capital letters and lowercase letters are connected.

The letters are either above, below, or on a baseline.

The downstrokes and upstrokes are an even width .

Answers

Answer:

The letters are either above, below, or on a baseline.

Explanation:

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