What do scientists who study the human microbiome hope to achieve?
Answers
Answer:
Explanation:
Researchers hope to gain knowledge about how the microbiome contributes to health and disease states.
Related Questions
1.1 L of nitrogen dioxide were produced in the reaction seen below. How
many liters of oxygen gas were used if the reaction occurred at STP?*
2N0 + 02 --> 2NOZ
O 22.4L
O 2.2L
O 0.55L
O 17.6L
Answers
. The soft drink Mr. Pibb contains (among other things) 39 g of sucrose in 355 mL of solution. What is the molarity of sucrose in this solution
Answers
The molarity of sucrose in Mr Pibb can be calculated using the formula of molarity, which is: Molarity = moles of solute/volume of solution in litres. The molarity of sucrose in Mr Pibb is 0.321 M.
Mr. Pibb contains 39 g of sucrose in 355 mL of solution. First, we need to convert the volume of the solution to litres by dividing it by 1000.355 mL = 0.355 L. Now, we need to convert the mass of sucrose to moles by using its molar mass. The molar mass of sucrose is 342.3 g/mol.Moles of sucrose = Mass of sucrose / Molar mass of sucroseMoles of sucrose = 39 g / 342.3 g/mol Molecules of sucrose = 0.1139 mol. Finally, we can calculate the molarity of sucrose in Mr Pibb: Molarity = moles of solute/volume of solution in litersMolarity = 0.1139 mol / 0.355 LMolarity = 0.321 M
Molarity is a measure of concentration, which is the amount of solute present in a given volume of solution. It is defined as the number of moles of solute per litre of solution. To calculate the molarity of sucrose in Mr Pibb, we first need to convert the volume of solution to litres by dividing it by 1000. Then, we need to convert the mass of sucrose to moles using its molar mass. Finally, we can use the formula of molarity to calculate the concentration of sucrose in Mr Pibb. The molarity of sucrose in Mr Pibb is 0.321 M. This means that there are 0.321 moles of sucrose in one litre of Mr Pibb. Sucrose is a disaccharide composed of glucose and fructose. It is a common sweetener used in food and beverages. However, consuming too much sucrose can lead to health problems such as obesity, diabetes, and tooth decay. Therefore, it is important to consume sugary drinks like Mr Pibb's in moderation.
The molarity of sucrose in Mr Pibb is 0.321 M. This means that there are 0.321 moles of sucrose in one litre of Mr Pibb. The calculation of molarity requires the conversion of the volume of solution to litres, the conversion of the mass of solute to moles, and the use of the formula of molarity. Sucrose is a common sweetener used in food and beverages, but excessive consumption can lead to health problems. Therefore, it is important to consume sugary drinks like Mr Pibb in moderation.
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What kind of reaction is the chemical equation C6H12O8 + O2 → CO2 + H2O
Answers
answer : 6CO2 + 6H2O → C6H12O8 + 5O2
Explanation:
Label Each Compound With a Variable
aCO2 + bH2O = cC6H12O8 + dO2
2. Create a System of Equations, One Per Element
C: 1a + 0b = 6c + 0d
O: 2a + 1b = 8c + 2d
H: 0a + 2b = 12c + 0d
3. Solve For All Variables
a = 6
b = 6
c = 1
d = 5
4. Substitute and Verify Result
6CO2 + 6H2O = C6H12O8 + 5O2
Can a stable compound be made from lithium and oxygen
Answers
Answer:
No, because oxygen wants two electrons to become stable and lithium will only give up 1 electron.
I need answers plz
btw D says ice crystals
Answers
Answer:
B. Hydrogen and oxygen molecules
General Formulas and Concepts:
Chemistry - Reactions
Reactants are always on the left side of the arrowProducts are always on the right side of the arrowExplanation:
Step 1: Define
Reaction RxN: 2H₂ + O₂ → 2H₂O
Step 2: Identify
Reactants: H₂ and O₂
Products: H₂O
Calculate the standard reaction enthalpy for the reaction below:
3Fe2O3(s) → 2Fe3O4(s) + ½O2(g)
Answers
The standard reaction enthalpy for the given reaction is +235.8 kJ/mol.
What is the standard reaction enthalpy of reaction?The standard reaction enthalpy (ΔH°) for the given reaction is determined as follows:
Equation of reaction: 3 Fe₂O₃ (s) → 2 Fe₃O₄ (s) + ½ O₂ (g)
The standard enthalpy of formation values for Fe₂O₃ (s), Fe₃O₄(s), and O₂(g) is used to calculate the standard reaction enthalpy.
ΔH° = [2 × ΔH°f(Fe₂O₃)] + [½ × ΔH°f(O₂)] - [3 × ΔH°f(Fe₃O₄)]
where;
ΔH°f(Fe₂O₃) = -824.2 kJ/mol
ΔH°f(Fe₃O₄) = -1118.4 kJ/mol
ΔH°f(O₂) = 0 kJ/mol
ΔH° = [2 × (-1118.4 kJ/mol)] + [½ × 0 kJ/mol] - [3 × (-824.2 kJ/mol)]
ΔH° = -2236.8 kJ/mol + 0 kJ/mol + 2472.6 kJ/mol
ΔH° = 235.8 kJ/mol
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Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 2CO(g) + 2NO(g)2CO2(g) + N2(g)
Answers
The standard enthalpy change for the given reaction is -1266.2 kJ/mol. This indicates that the reaction is exothermic, and that the formation of the products releases energy to the surroundings.
The standard enthalpy change for the given reaction can be calculated using the standard heats of formation (∆Hf) of the reactants and products. The standard heat of formation (∆Hf) is the enthalpy change that occurs when one mole of a substance is formed from its elements in their standard states at a specified temperature and pressure.The balanced chemical equation for the reaction is:2CO(g) + 2NO(g) → 2CO2(g) + N2(g)The standard heats of formation (∆Hf) for the reactants and products are:\(∆Hf(CO(g)) = -110.5 kJ/mol\)\(∆Hf(NO(g)) = 90.4 kJ/mol\)\(∆Hf(CO2(g)) = -393.5 kJ/mol\)\(∆Hf(N2(g)) = 0 kJ/mol\)The standard enthalpy change (∆H°) for the given reaction can be calculated using the formula:\(∆H° = ∑n∆Hf(products) - ∑n∆Hf(reactants)\)where n is the stoichiometric coefficient of each species in the balanced equation.Substituting the values of standard heats of formation into the formula, we get:\(∆H° = [2(-393.5 kJ/mol) + 1(0 kJ/mol)] - [2(-110.5 kJ/mol) + 2(90.4 kJ/mol)]\)= -1266.2 kJ/molTherefore, the standard enthalpy change for the given reaction is -1266.2 kJ/mol. This indicates that the reaction is exothermic, and that the formation of the products releases energy to the surroundings.For more such question on standard enthalpy
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CaCl2 is a salt that forms as the result of what type of bond?
Answers
Ionic bonds, which hold the ions together, result in an ionic compound. In most cases, ionic compounds are created between metal and nonmetal components.
CaCl2 is a form of salt, right?A calcium salt, an inorganic chloride, and an inorganic calcium salt all make up calcium dichloride. It functions as fertilizer. The ionic compound calcium chloride is created when calcium and chlorine interact. It is highly water soluble and liquescent.
How is the CaCl2 bond created?Calcium chloride (CaCl2) is mostly created when hydrochloric acid reacts with limestone (CaCO3) (HCl). You can write the chemical equation like this. It is also created as a key by-product in the Solvay process, which involves reacting limestone with NaCl solution to make soda ash Na2CO3.
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balance the following equation __N2+__O2→__N2O
Answers
Answer:
2N₂ + O₂ → 2N₂O
Explanation:
Given equation:
N₂ + O₂ → N₂O
In balancing a chemical equation, the number of atoms on both sides of the expression must be the same.
To solve this problem, we use a simple mathematical approach;
put coefficients a,b and c
aN₂ + bO₂ → cN₂O
Conserving N;
2a = 2c
Conserving O:
2b = c
Let a = 1, c = 1 , b = \(\frac{1}{2}\)
multiply through by 4
a = 2, b = 1 and c = 2
Balanced equation is;
2N₂ + O₂ → 2N₂O
after millikan performed his oil drop experiemnt, he concluded that
Answers
Answer:
charges on the drops were all integer multiples of a fundamental unit of charge.
How do I solve this?
Answers
Answer:
C
Explanation:
Particles inside the nucleus = protons + neutrons = mass number = 84
particles outside = electrons number = atomic number
if the number of atoms of a radioactive substance has decayed to 25 atoms in five half-lives,what was the original number of atoms in the substance?
Answers
The original number of atoms in the radioactive substance was 800 atoms.
How many atoms were there in the original substance?In radioactive decay, the number of atoms of a substance decreases over time. Each half-life is the time it takes for half of the atoms to decay. If the number of atoms has decayed to 25 in five half-lives, it means that after each half-life, the number of atoms halved until it reached 25.
To determine the original number of atoms, we need to reverse the process. Since there are five half-lives, we know that the number of atoms halved five times. Starting from 25 atoms, we can double the number of atoms five times to find the original amount.
25 atoms → 50 atoms → 100 atoms → 200 atoms → 400 atoms → 800 atoms
Therefore, the original number of atoms in the radioactive substance was 800 atoms.
In radioactive decay, the number of atoms decreases exponentially over time due to the spontaneous emission of particles or radiation. The rate of decay is determined by the half-life, which is the time required for half of the atoms in a sample to decay. By applying the concept of half-lives, scientists can estimate the original amount of a radioactive substance based on the current number of atoms.
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I need help with this pls
Answers
Answer:
H - Cl2 +NaBr -> Br2+2NaCl
Using immunoprecipitation, you can isolate a protein (protein X) you think is involved in chronic myelogenous leukemia (CML), which is caused, in part, by a hyperactive tyrosine protein kinase called ABL. You think one of the targets of ABL is the protein X that you can purify. In comparing tissues with and without the disease, you subject the samples to isoelectic focusing. Understanding how IEF works, how would you expect the samples with CML to migrate compared to the wild type, non-diseased sample protein?
A. The phosphorylated protein will have a lower isoelectric point and thus migrate further toward the anode.
B. The phosphorylated protein will be more attracted to the negative charge on the anode.
C. The non-phosphorylated proteins from the non-diseased samples will move further to the anode without the bulky phosphate group attached to a tyrosine.
D. Non-diseased proteins will migrate with a lower pl than those from diseased tissues and thus the samples from the non-diseased samples will migrate more to the anode than diseased protein.
Answers
The non-phosphorylated proteins from the non-diseased samples will move further to the anode without the bulky phosphate group attached to a tyrosine. The correct option is C.
Isoelectric focusing (IEF) is a technique used to separate proteins based on their isoelectric points (pI), which is the pH at which a protein has a net neutral charge. During IEF, proteins migrate in an electric field through a pH gradient until they reach a region of the gel where the pH matches their individual pI, resulting in immobilization.
In the context of chronic myelogenous leukemia (CML), where the hyperactive tyrosine protein kinase ABL is involved, the phosphorylation of proteins plays a significant role. Phosphorylation refers to the addition of a phosphate group to a protein. Phosphorylated proteins generally have a different charge distribution compared to non-phosphorylated proteins.
In this scenario, it is likely that protein X, which is suspected to be a target of the hyperactive ABL kinase, would be phosphorylated in the samples with CML. The addition of a phosphate group to the protein alters its charge distribution, leading to a change in its pI. Therefore, the phosphorylated protein X would have a different pI compared to the non-phosphorylated form.
Given this information, we can deduce that the non-phosphorylated proteins from the non-diseased samples would have a lower pI compared to the phosphorylated protein X from the CML samples. Consequently, the non-phosphorylated proteins would migrate further toward the anode in the isoelectric focusing process, as they would be attracted to the region of the gel with a higher positive charge.
This aligns with option C, which states that non-phosphorylated proteins from the non-diseased samples would move further to the anode without the bulky phosphate group attached to a tyrosine.
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What term describes the application of water to farmland from
a source such as a lake or river?
Answers
The term that describes the application of water to farmland from a source such as a lake or river is "irrigation."
What is Irrigation?
Irrigation is the process of artificially supplying water to crops or plants to promote their growth and development. It involves the application of water to agricultural land using various techniques, such as sprinklers, drip systems, or flood irrigation. The primary purpose of irrigation is to supplement the natural rainfall that is insufficient or irregular in certain regions, allowing farmers to grow crops in areas that would otherwise be unsuitable for farming. Irrigation systems can be designed to deliver the required amount of water directly to the roots of plants, which can increase crop yields and improve the quality of the produce. However, overuse or mismanagement of irrigation can lead to waterlogging, soil salinization, and other environmental problems.
Irrigation is the artificial application of water to land for the purpose of agricultural production. It is a critical practice in areas where rainfall is insufficient or unreliable, as it provides a reliable source of water for crops to grow. Irrigation systems can vary widely depending on the type of crops being grown, the availability of water, and the topography of the land.
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A trainer wanted to train a dolphin to do a different trick every day and compare it with the trick on the original day to see how many tricks the dolphin
could learn to do.
Answers
How many moles of AgNO3 must react to form 0.854 mol Ag?
mol AgNO3
Answers
Answer:
0.854
Explanation:
The equation of its dissolution in water is: AgNO3 → Ag + (aq) + NO3- (aq)
and AgNO3 → Ag + (aq) + NO3- (aq)
1 mol 1mol 1mol
? -------- 0.854mo
so for finding the value, it is sufficients to complute 1 x 0.854 mol =0.854 mol
so, 0.854 mol is required for the reaction to form 0.854 mol of Ag
which process is a chemical change
Answers
Name one substance in the diagram that would
have a net movement out of the cell. (The beaker has 5% ionide, 85% water, 10% protein, The cell has 90% water, 5% starch, and 5% glucose)
Answers
The substance in the diagram that would have a net movement out of the cell is Water.
What substance would move from the cell?The substance that will have to have a net movement out of the cell would need to first be in the cell. The only substances in the cell are water, starch, and glucose.
Water will be the most likely substance to have a net movement out of the cell thanks to the process of osmosis which allows water molecules to move from an area of high concentration to an area of low concentration across a semi - permeable membrane. This happens until the concentration gradient is the same across the semi - permeable membrane.
The water in the cell is 90 % which means it is 5 % more than the 85 % water in the beaker. Water would therefore move out of the cell in a net movement until the concentration is the same in the beaker and the cell.
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which one of the following is not a statement of the kinetic molecular theory? a) gas particles will be attracted to one another. b) the volume available to the gas particles is equal to the volume of the container. c) the measured pressure is from collisions of the gas particles with the walls of the container. d) the average kinetic energy is proportional to the temperature of the system.
Answers
The kinetic molecular theory does not suggest that "gas particles will be attracted to one another. Hence, the correct option is (a).
The kinetic molecular theory is a set of assumptions about the behavior of gases based on the motion of their constituent particles.
1. The gas particles are in constant, random motion and are in collisions with each other and the walls of the container.
2. The volume occupied by the gas particles is negligible compared to the volume of the container.
3. The collisions between gas particles and the walls of the container result in a measurable pressure.
4. The average kinetic energy of the gas particles is proportional to the temperature of the system.
The first three assumptions are considered to be part of the basic kinetic molecular theory, while the fourth assumption is sometimes referred to as the equipartition theorem.
Therefore, the statement "gas particles will be attracted to one another" is not part of the kinetic molecular theory and is incorrect. The interactions between gas particles are not considered in this theory, which assumes that they do not interact with each other except during brief, elastic collisions.
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Which describes the MOST LIKELY effect of the mismatch on future birds?
A. There could be a shift to earlier reproduction in
the birds.
B. The next generations of birds may choose to not
reproduce.
C. There could be a shift to later reproduction in the
birds.
D. The next generations of birds may choose to
reproduce more often.
Answers
The statement which best describes the most likely effect of the mismatch on future birds is that there could be a shift to later reproduction in the birds and is therefore denoted as option C.
What is Reproduction?
This is referred to as the process in which an offspring is produced from their parent or cells and involves the fusion of gametes.
In the effect of mismatch on future birds, there will be a reduction in the birds getting a mate which therefore shift to later reproduction and is therefore the reason why option C was chosen as the correct choice.
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The statement that describes the most likely effect of the mismatch on future birds is that there could be a shift to later reproduction in the
birds.
So option C is correct.
What is reproduction?Reproduction is described as the biological process by which new individual organisms offspring are produced from their "parent" or parents.
If there is mismatch on future birds, one of the many effects is that there could be a shift to later reproduction in the birds which the consequences of such mistiming in reproduction are reduced reproductive output.
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classify each of the following reactions as exothermic or endothermic a. paper burning with a bright flame b. plastics becoming brittle after being left in the sun c. a firecracker exploding
Answers
(a) Paper burning with a bright flame is an exothermic reaction.
(b) Plastics becoming brittle after being left in the sun is an endothermic reaction.
(c) A firecracker exploding is an exothermic reaction.
Exothermic reactions are those that release energy in the form of heat or light. In the case of paper burning, the energy stored in the paper's chemical bonds is released as heat and light, making it an exothermic reaction.
Endothermic reactions are those that absorb energy from the surroundings, causing the temperature to decrease. Plastics becoming brittle after being left in the sun is an endothermic reaction because the energy from the sun is absorbed by the plastic, causing it to break down and become brittle.
An exothermic reaction occurs when energy is released in the form of heat or light, which is what happens when a firecracker explodes. The chemicals inside the firecracker react with each other, releasing energy in the form of heat and light, which creates the loud bang and the explosion.
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Pleaseee help ASAP
will mark brainliest!!! <3
Answers
Answer:
Fluorine belongs to the group 7 A so it must have 7 electrons in the oribits so the answer would be A as u count the electrons in the orbits, There are exactly 7 electron
Explanation:
For a chemical reaction, the activation energy for the forward reaction is 143 kJ and the activation energy for the reverse reaction is 9.08 x 104 J. What is the overall energy change for the forward reaction
Answers
The overall energy change for the forward reaction is 52.2 kJ.
The activation energy for the forward reaction is given as 143 kJ, and the activation energy for the reverse reaction is 9.08 x 104 J.
We can calculate the overall energy change for the forward reaction using the Arrhenius equation.
The Arrhenius equation relates the rate constant, temperature, and activation energy for a chemical reaction. It is given as follows:
\(k = Ae^(-Ea/RT)\)
where k is the rate constant, A is the pre-exponential factor, Ea is the activation energy, R is the gas constant, and T is the temperature. The rate constant is directly proportional to the energy of activation.
The activation energy is defined as the minimum amount of energy required to start a chemical reaction. The activation energy is directly proportional to the rate of the reaction, i.e., the higher the activation energy, the slower the rate of the reaction.In this problem, we are given the activation energies for the forward and reverse reactions.
To calculate the overall energy change for the forward reaction, we need to subtract the activation energy for the reverse reaction from the activation energy for the forward reaction.
E_forward = 143 kJ
E_reverse = 9.08 x 104 J
We need to convert the activation energy for the reverse reaction to kJ by dividing by 1000.
E_reverse = 9.08 x 104 J / 1000
= 90.8 kJ
Now we can calculate the overall energy change:
E_overall = E_forward - E_reverseE_overall
= 143 kJ - 90.8 kJ
E_overall = 52.2 kJ
Therefore, the overall energy change for the forward reaction is 52.2 kJ.
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1) Calculate the % Error when the Experimental value is 5.5 grams and the
Accepted value is 5.0 grams.
Answers
Copper is mostly utilized in generators, house and auto wiring, as well as the cables in gadgets like radios, TVs, computers, lighting, and motors due to its flexibility and good conductivity.
What led to General Motors' demise?The expenses of legacy health care and company pensions were also fixed. Therefore, many costs remained largely same as revenues declined. This resulted in losses. Due to the mounting losses and the weakening economy, GM was no longer able to operate as a profitable company.
Who currently owns General Motors?Who is the GM Company's owner? Stockholders, 12.56% General Motors Co. insiders, plus 7.47% retail investors collectively own 79.97% of General Motors Co. (NYSE: GM). The largest individual Ford Motor Co. fund is Retired person Medical Benefits Trust UAW.
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A 0.366 g sample of hydrated tin(II) chloride (SnCl2•xH2O) is found to contain 0.0586 g of water. What is the approximate percent of water in the hydrate? What is the value of x?
16%
2. 81%
3. 84%
4. 75%
5. 19%
Part 2
1. 5
2. 1
3. 4
4. 2
5. 6
6. 3
Answers
1. The approximate percent of water in the hydrate is 16%
2. The value of x in the hydrate is 2
Data obtained from the question Mass of hydrate, SnCl₂•xH₂O = 0.366 gMass of water, H₂O = 0.0586 gPercentage of water =? Value of x =? 1. How to determine the percentage of water in the hydrateMass of hydrate, SnCl₂•xH₂O = 0.366 g
Mass of water, H₂O = 0.0586 g
Percentage of water =?
Percentage = (mass of water / mass of hydrate) ×100
Percentage of water = (0.0586 / 0.366) × 100
Percentage of water = 16%
2. How to determine the value of xTo obtain the value of x, we shall determine the formula of the hydrate. This can be obtained as follow:
Mass of hydrate, SnCl₂•xH₂O = 0.366 gMass of water, H₂O = 0.0586 gMass of anhydrous, SnCl₂ = 0.366 – 0.0586 = 0.3074Formula of hydrate =?Divide by their molar mass
SnCl₂ = 0.3074 / 190 = 0.0016
H₂O = 0.0586 / 18 = 0.0032
Divide by the smallest
SnCl₂ = 0.0016 / 0.0016 = 1
H₂O = 0.0032 / 0.0016 = 2
Thus, the formula of the hydrate is SnCl₂•2H₂O
Comparing the formula of the hydrate (SnCl₂•2H₂O) with SnCl₂•xH₂O, we can see that the value of x is 2
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A hot air balloon rises because the fire warms up the air and the air circulates to fill the balloon and lift it at the same time. What type of heat transfer is this?
A.Conduction
B.Convection
C.Radiation
D.Absorption
PS: Please Hurry ! Thank You !
Answers
Answer:
B.
Explanation:
Convection is the transfer of heat energy, I'm REALLY sure. Please tell me if its wrong in the comments!
what is the angle between one of the carbon-hydrogen bonds and one of the carbon-chlorine bonds in the methylene chloride ( ) molecule?
Answers
The angle between one of the carbon-hydrogen bonds and one of the carbon-chlorine bonds in the methylene chloride (CH2Cl2) molecule is approximately 109.5 degrees.
This angle is a result of the tetrahedral geometry of the carbon atom in the molecule, which has four electron pairs around it. Two of these electron pairs are involved in the carbon-hydrogen bonds, and the other two are involved in the carbon-chlorine bonds. The shape of the molecule is determined by the repulsion between these electron pairs, which results in a tetrahedral arrangement. The angle between any two bonds in a tetrahedral molecule is approximately 109.5 degrees. This geometry is important for understanding the properties and behavior of molecules, as it affects how they interact with other molecules and their reactivity in chemical reactions.
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An aqueous solution is 10.% glucose by mass (d = 1.039 g/mL at 20°C). Calculate its freezing point, boiling point at 1 atm, and osmotic pressure
Answers
The values of
Boiling point for the solution: 100.32°C
Freezing point for the solution: -1.15°C
Osmotic pressure for the solution at 20°C: 13.9 atm
What is osmotic pressure?The osmotic pressure is the least amount of pressure that must be applied to a solution in order to block the passage of the solution's pure solvent through a semipermeable membrane.It can alternatively be described as a measurement of a solution's propensity to osmotically absorb a pure solvent. The highest osmotic pressure that may form in a solution if it were cut off from its pure solvent by a semipermeable membrane is known as the potential osmotic pressure.When two solutions with various solute concentrations are separated by a selectively permeable membrane, osmosis takes place.From the low-concentration solution to the solution with increasing solute concentration, solvent molecules move across the membrane preferentially. Up until equilibrium is reached, solvent molecules will continue to move.we know that
Mass = \(volume \times density\)
Mass = \(1.039 \times 1000 = 1039\)gm solution
Then the amount of the solute and solvent are
Mass = \(0.10 \times 1039 = 103.9 g\) solute
Mass = \(0.9 \times 1039 = 935.1g\) solvent
now moles of glucose = \(\frac{103.9}{180} = 0.577 moles\)
now molarity M = \(\dfrac{moles}{volume} = \dfrac{0.577}{1} = 0.577\)
we know that
\(\Delta T = K_b \times m = 0.577 \times 0.617 = 0.32\)
hence the boiling point is
\(\Delta T = T_b - T\\T_b = 100 + 0.32 = 100.32\)
osmotic pressure = \(\pi = MRT\\\pi = 0.577 \times 0.082 \times 293 =13.9 atm\)
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You can increase the strength of an electromagnet by
A. changing the position of the compass.
B. adjusting the magnetic declination.
C. using a stronger ferromagnetic material for the core.
D. reversing the magnetic domains.
Answers
Answer:
A. changing the position of the compass