Which of the following characteristics best describes Lewis antibodies?
A. IgM, naturally occurring, cause HDFN
B. IgM, naturally occurring, do not cause HDFN
C. IgG, in vitro hemolysis cause hemolytic transfusion reactions
D. IgG, in vitro hemolysis, do not cause hemolytic transfusion reactions

Answers

Answer 1

Lewis antibodies are IgM antibodies that are naturally occurring and do not cause hemolytic disease of the fetus and newborn (HDFN). Option B is correct.

Lewis antibodies (B) are a type of naturally occurring IgM antibodies. They are present in the plasma of individuals and do not typically cause hemolytic disease of the fetus and newborn (HDFN). IgM antibodies are generally unable to cross the placenta and cause HDFN because of their large molecular size.

Lewis antibodies are part of the Lewis blood group system, which is one of the many blood group systems in humans. These antibodies are naturally present in the plasma and are not associated with any significant clinical manifestations or complications. They are not typically involved in transfusion reactions or in vitro hemolysis.

On the other hand, IgG antibodies (C) are capable of crossing the placenta and can cause hemolytic transfusion reactions and HDFN. These antibodies can lead to destruction of red blood cells cytotoxic and result in serious complications in certain situations.

Therefore, the best description of Lewis antibodies is that they are IgM antibodies that are naturally occurring and do not cause HDFN.

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Related Questions

Why is the immune system necessary in
an organism?
A. without it there would be nothing to fight off infection
B. it provides structure for the body
C. the cells transfer oxygen around the body
D. the organs in it help absorb nutrients for the body

Answers

A-When the immune system is functioning properly, it can fight off disease-causing organisms including bacteria, viruses, and parasites as well as cancer cells while safeguarding healthy tissue.

Answer: A

Explanation:

Most mycoses are difficult to treat because?

Answers

According to the research, most mycoses are difficult to treat because to determine the responsible fungus it is necessary to culture the lesions.

What is contact dermatitis?

They are skin conditions resulting from parasitization by "fungi"; these are vegetables that do not carry out the phenomenon of photosynthesis.

They are caused by fungi belonging to the genera Epidermophyton, Microsporum and Trichophyton.

Therefore, we can conclude that according to the research, most mycoses are difficult to treat because to determine the responsible fungus it is necessary to culture the lesions.

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Blood transport_________ from the lungs to all the cells of the body.

Answers

Answer:

Blood transports oxygen from the lungs to all cells of the body.

Explanation:

In the circulatory system , a person breaths in air which is then filtered for oxygen an d the rest of the components are discarded through exhaling .

The oxygen is then taken in by air sacks which later combines blood with oxygen , so hemoglobin which is a blood component takes it to form oxyhemoglobin , which runs through the blood vessels , to the cells for consumption .

The cells will then deposit the deoxygenated blood which returns back tot he heart and then lungs for oxygenation .

Select the correct answer from each drop-down menu. rna interference is a mechanism of eukaryotic gene regulation. in this mechanism, the enzyme "dicer" cuts dsrna into smaller fragments called , which form a complex with risc and degrade specific .

Answers

The dicer enzyme processes dsRNA and forms siRNAs, which suppress the expression of target genes by cutting mRNA. 1) siRNA 2) RNA.

What are siRNA fragments?

siRNA means small interfering RNA. This is a silencing RNA molecule involved in the RNA interference mechanism, intervening in the expression of a specific gene.

siRNAs are complementary double-stranded RNA molecules composed of about 20-21 nucleotides. siRNA originates from a long double-stranded RNA (dsRNA).

The dicer enzyme cuts dsRNA molecules and produces siRNA. siRNAs suppress the expression of target genes when cutting messenger RNA.

siRNAs suppress the expression of target genes by cutting the complementary messenger RNA (mRNA) into two halves. This is accomplished by the interaction of the siRNA with the RISC complex (RNA-induced silencing complex).

The two mRNA halves are later degraded by the cellular machinery, leading to the suppression of the gene expression.

siRNAs also participate in other pathways related to RNAi, such as in antiviral defense or in the chromatin structure organization.

RNA interference is a mechanism of eukaryotic gene regulation. In this mechanism, the enzyme dicer cuts dsRNA into smaller fragments called (1) siRNA, which form a complex with RISC and degrade specific (2) RNA.

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On each side of the skull, the __________ suture joins the parietal bone with the temporal bone.

Answers

On each side of the skull, the Squamosal suture joins the parietal bone with the temporal bone.

The squamosal or squamous suture is the cranial suture between the temporal and parietal bones bilaterally. From the pterion, it extends posteriorly, curves inferiorly and continues as the parietotemporal suture. The squamous suture is the connecting joint in the skull between the parietal bone and the lower portion of the temporal bone called the par squamosa. Edges of the squamous suture overlap in a scale-like formation. It is located just above the ears on both sides of the head. The squamous suture forms the joint of the skull between the squamous part of the temporal bone and the inferior aspect of the parietal bone.

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DNA:_______.
a. is single stranded.
c. directs cellular function.
b. contains six different nucleotide bases.
d. contains the base uracil.

Answers

DNA is single-stranded. There are two types of DNAs, fiber polymer(ssDNA) and double-stranded polymer (dsDNA). Consequently, the polymer binding proteins typically contain fiber DNA-binding proteins (SSBs) and double-stranded DNA-binding proteins(DSBs).

Single-stranded DNA binding proteins (SSBs) and double-stranded DNA binding proteins (DSBs) are two different types of DNA binding proteins that participate in many biological processes.

While SSBs typically serve roles in DNA replication, recombination, and repair, among other processes, DSBs typically operate as transcriptional factors to control the expression of the genes. For the study of protein functions, knowing a DNA binding protein's binding specificity is useful.

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According to the theory of endosymbiosis, early eukaryotes evolved by symbiotic association of prokaryotes. Which two protists evolved from a symbiotic relationship of organisms, which resulted in eukaryotic organisms containing chloroplasts?
paramecium
red algae
euglena
slime molds

Answers

The two protists that evolved from a symbiotic relationship of organisms are red algae and euglena.

What is symbiotic relationship of organisms?

The symbiotic relationship is defined as the type of close relationship between two different organisms where by one or both benefit from each other.

According to the theory of endosymbiosis, which states that in symbiosis which involves a larger cell that serves as a host and a smaller cell that is referred to as an endosymbiont.

Therefore the two protists that evolved from a symbiotic relationship of organisms, which resulted in eukaryotic organisms containing chloroplasts is the red algae

euglena.

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Many chlorophytes are unicellular, but others are bigger and more complex. The fact that increased size and complexity evolved in different ways indicates ________.

Answers

Many chlorophytes are unicellular, but others are bigger and more complex. The fact that increased size and complexity evolved in different ways indicates the chlorophyte group contained extensive genetic variability.

What are chlorophytes?

Green algae are known as chlorophytes, and as their name suggests, the chlorophyll in the thylakoid gives them their green color. They also include other pigments including xanthophyll and beta-carotene. They can be unicellular or multicellular depending on the species.

Chlorophyta converts sunlight to starch that is stored in cells as a food reserve. Because of their ability to photosynthesize, chlorophytes are among the ecosystem's most significant producers. As a byproduct of photosynthesis, they are a significant supply of starch and oxygen. Many heterotrophs eat them as food. Numerous chlorophytes interact symbiotically with other types of species.

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Living organisms require a large temperature stimulus before the body temperature changes because the ______ bonds of water counteract molecular movement.

Answers

Living organisms require a large temperature stimulus before the body temperature changes because the hydrogen bonds of water counteract molecular movement.

Numerous qualities of water are essential to sustaining life-

Because of its polarity, water may establish hydrogen bonds that enable ions and other polar molecules to dissolve in it. Water is an ideal solvent as a result. Water can keep heat better than many other substances because of the hydrogen bonds that exist between its molecules. The hydrogen bonds between water constantly break and reform as the temperature rises, allowing the system's overall temperature to stay steady despite the addition of more energy. Surface tension is a result of the cohesive forces in water.

All of these distinctive qualities of water are crucial to the chemistry of living things.

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The movement of water into and out of plant cells described by ____________ which is the ability of water to ____________ .

Answers

The movement of water into and out of plant cells is described by water potential which is the ability of water to do work.

What is water potential?

It is the capacity of water to move from one place to another. Work is done when a substance moves from one place to another. Simply put, water potential is the capacity of water to do work.

Water moves into and out of a cell depending on the water potential of the cell and that of the ambient solution. naturally, water will always move from the region of high to the region of low water potential in cells.

Thus, if the water potential of cells is higher, water will move out of cells to the surrounding. If the water potential of cells is lower, water will enter cells from the surrounding.

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A volcano erupts, harming all the organisms in the area. Eventually, small plants grow but are eventually replaced by larger plants. What is the name for this process?
A. Biodiversity
B. Population
C. Cyclical
D. Succession

Answers

D. Succession


Description
Succession is the change in either species composition, structure, or architecture of vegetation through time.
The answer is D. Succession helps to form a new environment and bring life back such as plants and nutrients.

What is the process that ensures mitral and tricuspid valve closure after the ventricles are filled with blood?

Answers

Diastole is the process that ensures mitral and tricuspid valve closure after the ventricles are filled with blood.

Cardiac cycle events can be divided into diastole and systole. Diastole represents ventricular filling, and systole represents ventricular contraction/ejection. Systole and diastole occur in both the right and left heart, though with very different pressures.

Diastole begins with the closing of the aortic valve (or pulmonic) and ends with the closing of the mitral valve (or tricuspid). This period encompasses the ventricular relaxation and filling.

Diastole represents when the blood vessels return blood to the heart in preparation for the next ventricular contraction.

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Which of the following types of babies are most likely to be outwardly unaffected by a caregiver leaving or returning

Answers

Avoidant attachment types of babies are most likely to be outwardly unaffected by a caregiver leaving or returning.

Avoidant attachment

The way you typically behave or think when interacting with others is known as your avoidant attachment style. Your attachment type is influenced by the early interactions you have with your parents or other primary caregivers. Your attachment style may be secure, anxious, avoidant, disorganized, or another type depending on how attentive and connected these caregivers were to you. In trying to keep the peace and their caregiver near by, the youngster ignores their own challenges and wants. They still experience difficulties and negative emotions like anxiety or depression, but they do it on their own and downplay their significance. Through maturity, a person's attachment style frequently persists, which may have an effect on their friendships, romantic connections, and other connections. The avoidant attachment patterns present in today's population are about 30%.

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Which condition is a heightened response that occurs after exposure to a noxious stimulus?

Answers

Hyperalgesia is a heightened response that occurs after exposure to a noxious stimulus.

Hyperalgesia:

An increased sensitivity to feeling pain and extreme response to pain. When the nerves or the chemical makeup of the nerve pathways involved in pain perception are damaged, hyperalgesia may result. Your body's particular nerve receptors are becoming more sensitive, which is the reason for this. As a result of a surgery or procedure, tissue or nerve injury may result in hyperalgesia. Additionally, it can happen to persons who are using opioids.

A noxious stimulus is one that is potent enough to endanger the integrity of the body (i.e. cause damage to tissue). Peripheral afferents, such as A-delta and C-nerve fibers and free nerve endings, are induced by noxious stimuli and are responsible for transmitting pain throughout an organism's nervous system.

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Justin has decided that he wants to involve his employees in all of the different steps of decision making: identifying problems, generating alternatives, selecting solutions, planning implementations, and evaluating results. If he does this, he can expect that employee performance and job satisfaction will

Answers

Justin has decided that he wants to involve his employees in all of the different steps of decision-making: identifying problems, generating alternatives, selecting solutions, planning implementations, and evaluating results. If he does this, he can expect that employee performance and job satisfaction will increase.

What is job satisfaction?

A measure of a worker's contentment with their job, whether they like the job or specific features or facets of occupations, such as the nature of the job or supervision, is called job satisfaction, employee satisfaction, or work satisfaction. The cognitive (or evaluative), affective (or emotional), and behavioral components of job satisfaction can all be assessed. Researchers have also highlighted that different job satisfaction measures vary in how much they represent thoughts or feelings about the job.

Employee performance is characterized by how well they carry out their job responsibilities and complete their assigned tasks. It speaks to the usefulness, excellence, and efficacy of their output. Performance is a factor in how valuable we consider each person to be to the company.

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Which of these scenarios describe(s) LTD?

Answer choices:

Neuron A fires infrequently upon neuron B, which is silent, which leads to a decrease in their connection strength
Neuron A fires strongly and neuron B fires weakly, which leads to an increase in their connection strength
Neuron A and B both fire, but asynchronously, from an incoming stimulus and decrease their connection strength
Neuron A fires strongly and repeatedly, but not neuron B, which leads to an increase in their connection strength

Answers

The correct answer choice which is true about neurons is Neuron A fires strongly and neuron B fires weakly, which leads to an increase in their connection strength

What is a Neuron?

Neurons can simply be defined

as the fundamental and functional units of the nervous system. Neurons are also known as nerves.

There are basically three classes of neurons: These are

Efferent neuronesAfferent neuronesIntermediate neurons

So therefore, neuron A fires strongly and neuron B fires weakly, which leads to an increase in their connection strength

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The term hominin refers to modern-day humans and our fossil relatives that are more similar to us than they are to chimpanzees. True False

Answers

True. The term hominin refers to modern-day humans and our fossil relatives that are more similar to us than they are to chimpanzees.

What is hominin?Hominins are our direct predecessors, extinct human species, and modern humans collectively (including members of the genera Homo, Australopithecus, Paranthropus and Ardipithecus).A member of the family Hominidae, which includes humans, gorillas, chimpanzees, and orangutans, is referred to as a hominid. A member of the subfamily Homininae, which includes humans, gorillas, and chimpanzees, is a hominine (excludes orangutans). A hominin is a chimpanzee or human who belongs to the Hominini tribe.Three distinct taxonomic levels were established for chimpanzees, gorillas, and humans. Humans are a member of the Hominini, sometimes known as hominins. The primary distinction between hominid and hominin is that the former refers to the family to which humans belong while the latter refers to the level of the tribe to which humans belong.

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Cardiac triggering monitors cardiac motion by coordinating the rf excitation pulse with the ______ wave of cardiac systole.

Answers

Cardiac triggering monitors cardiac motion by coordinating the rf excitation pulse with the R-wave of cardiac systole.

What is the function of the heart monitor?

A heart monitor is useful for measuring the rate of your beats per minute, especially if you do some physical activity. Continuous monitoring during practice helps to manage the functioning of the organism, visualizing when the heart beats increase and decrease

Through the electrocardiogram (ECG), the multi-parameter vital signs monitor follows the patient's heartbeat, which are captured through the ECG cable that is connected to some points on the patient's chest.

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Which information can be used to determine an atom's identity?

Counting the number of electrons
Counting both neutrons and electrons
Counting the number of neutrons
Counting the number of protons

Answers

The information which can be used to determine an atom's identity is by counting the number of protons

What is an atom?

An atom can be defined as the smallest part of an element which can take part in a chemical reaction.

So therefore, the information which can be used to determine an atom's identity is by counting the number of protons

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The reduction of blood volume occurs following severe dehydration and hemorrhage; however, although dehydration results in an increase in hematocrit, immediately following hemorrhage hematocrit is unchanged. Explain this difference.

Answers

During bleeding, both formed elements (platelets, white blood cells, red blood cells) and plasma are lost from the circulatory system. They are lost proportionally, so initially there is no change in hematocrit.

Hematocrit is the percentage of the blood volume made up of elements (Hct = cell volume/blood volume). During dehydration, only water and electrolytes are lost, and the number of cells remains constant - the same number of cells in a smaller volume leads to an increase in hematocrit. When the body tries to restore blood volume, the first thing to recirculate is water from the ECF and this increases the amount of water without increasing the amount of red blood cells, so the compensatory mechanism causes the hematocrit to fall.

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after two half-;ives (9 billion years) what percent of the orignal uranium remains?

Answers

The percentage of the orignal uranium that remains after two half-lives is 25%

Data obtained from the question Original amount (N₀) = 100%Number of half lives (n) = 2Percentage remainig (N) =?

How to determine the percentage remaining

N = N₀ / 2ⁿ

N = 100 / 2²

N = 100 / 4

N = 25%

Thus 25% of the original sample remains

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Which steps involved in the contraction of a skeletal muscle require binding and/or hydrolysis of atp?

Answers

Answer:

Dissociation of the myosin head from the actin filament requires the binding of ATP (I).

Select the correct answer. rachel ate a piece of fruit and happened to drop the seeds in her backyard. after a few weeks, she saw a small plant with flowers growing in the backyard. which group does this plant belong to? a. angiosperms b. gymnosperms c. pteridophytes d. bryophytes e. chytrids

Answers

Answer:

Angiosperms

Explanation:

Answer:

A. Angiosperms

Hope this helps!

Explanation:

Based on your knowledge of scientific laws and theories, which of the following is true?
a. Both laws and theories can be expressed in terms of a single mathematical equation.
b. They are ordered, with theories coming before laws.
c. A law explains what happens; a theory explains why something happens.
d. Neither laws nor theories can ever change.

Answers

Answer:

C

Explanation:

A law is an observation; a theory is the explanation of that observation.

source: http://www.differencebetween.net/miscellaneous/culture-miscellaneous/difference-between-theory-and-law/

In science, a scientific law is a descriptive statement or mathematical equation that describes a natural phenomenon or pattern consistently observed in the natural world.

The correct statement is option c.

The statement explains what happens and is often based on empirical evidence obtained from repeated observations and experiments.

On the other hand, a scientific theory is a well-substantiated and comprehensive explanation of some aspect of the natural world. It goes beyond mere observation and provides an understanding of why and how a particular phenomenon occurs. A scientific theory is supported by a substantial body of evidence, and it can be used to make predictions about future observations or experiments.

Scientific laws and theories are both essential components of scientific understanding, and they are not ordered in terms of coming before or after each other.

Hence , C is the correct option

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The most significant threat to biodiversity today is ________________. Group of answer choices the killing of competing species the elimination of habitat the introduction of foreign species. the reduction of sperm counts. the acidification of the oceans.

Answers

Answer:

B.) the elimination of habitat

Explanation:

While all of the answer choices could decrease biodiversity, the most prevalent issue comes from habitat loss as a result of urbanization and the overuse of natural resources.

What did not occur in the hadean eon? a.) formation of the earth b.) meteor bombardment c.) formation of earliest solid rock d.) oxygen begins to appear in the atmosphere

Answers

Answe. No rocks on the Earth r:

Explanation:

A boy has been reported to lack fear and not show any stress in dangerous situations. these symptoms suggest issues with which area of the brain?

Answers

If a person is not able to show stress in dangerous situations and lacks fear, there might be issues with an area of their brain known as the amygdala.

The amygdala is an almond-shaped structure which can be found in the medial temporal lobe of the brain, right in front of the hippocampus. It is a region of the brain which primarily deals with regulating our emotional processes like fear response but is also responsible for other strong emotions like aggression and pleasure. In case the amygdala gets damaged, it impairs the emotional memories of the person and also results in poor decision making.

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Osteoarthritis, or oa, is known as a degenerative joint disease and is characterized by hypertrophy of bone and the formation of _____, also known as bone spurs.

Answers

Osteoarthritis is known as degenerative joint disease and is characterized by hypertrophy of bone and the formation of Osteophytes, also known as bone spurs.

Osteoarthritis, also known as osteoarthrosis or degenerative joint disease, is a disorder of the joints characterized by progressive degeneration of the articular cartilage or of the entire joint, including the ligaments, subchondral bone, synovium (joint lining), and articular cartilage (bone beneath the cartilage).

On the extremities of bones, smooth, hard knobs of additional bone called bone spurs (also known as osteophytes) grow. They frequently manifest themselves in the joints, which are where two bones meet.

Following a joint or tendon injury, bone spurs can also develop.

Your body attempts to repair broken bones by growing new bone where it is injured.

Hence, Osteoarthritis lead to the formation of Osteophytes, also known as bone spurs.

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People with diseases that result in the malabsorption of which nutrient are at risk for a vitamin d deficiency?

Answers

Inadequate dietary vitamin D or its deficiency leads to malabsorption of calcium. Nutritional disorder leads to the rare disease rickets, which causes bones to become soft and bend in children. In adults, vitamin D deficiency leads to osteomalacia, which causes weak bones, bone pain and muscle weakness.

The body needs vitamin D to properly absorb calcium and phosphorus from the diet. However, keeping the right quantities of calcium and phosphorus in bones is challenging when vitamin D levels are low.

The two sources of vitamin D are-

Natural sunlight Foods such as fish oil, Egg yolk and fatty fishes like salmon and mackerel

There are other disease conditions which lead to poor absorption of vitamin D-

Inflammatory bowel diseaseCeliac diseasesKidney problems

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Match these items.

1. Aorta
bring blood to the heart

2. Veins
major artery bringing blood from the heart to the body

3. Pulse
doorways to the heart

4. Valve

measure of the rate of heart contractions
5. Atrium
heart passageway to the arteries

6. Ventricle
passage to the ventricle

Answers

The correct matching is as follows:

Veins - bring blood to the heartAorta - major artery bringing blood from the heart to the bodyValve - doorways to the heartPulse - measure of the rate of heart contractionsVentricles - heart passageway to the arteriesAtrium - passage to the ventricle

What are blood vessels?

Blood vessels are those vessels a re tubes in which blood in the body flows.

The blood vessels of the body include, veins, arteries and capillaries. Larger blood vessels include the aorta

The correct matching is as follows:

Veins - bring blood to the heartAorta - major artery bringing blood from the heart to the bodyValve - doorways to the heartPulse - measure of the rate of heart contractionsVentricles - heart passageway to the arteriesAtrium - passage to the ventricle

In conclusion, blood vessels transport blood throughout the body.

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anastasia is part of a grassroots environmental group. this is distinguished from mainstream environmentalism by its __________. Define contemporary art as collaborative integrative and process oriented how do these mediums and techniques differ from tradition or moderm arts Compounds containing nitrogen are often weak bases. One example is aminoethanol, which has the formula hoch2ch2nh2 and a kb value of 3. 1 10 You and your crew are responding to a call to a home where a child had a seizure. The family members are concerned and want to know what caused the seizure. You know all of the following could have caused the seizure EXCEPT:hypothermia 4. Approximate the solution to this system of equations.y = -2x+6y = 4x - 1 The main goal of customer discovery is to find out whether your competitors will drop their price to compete with you. Select one:O True O False How did Jamess actions lead to the enactment of the English Bill of Rights?ResponsesHe revealed how treacherous members of the Catholic Church were.He showed what could happen if a kingdom was left without an heir.He left his kingdom bankrupt and his subjects starving to death.He tried to force his beliefs on English subjects without permission. -(Advanced analysis) Assume the equation for the total demand for money is L = 0.4 Y + 80 4 i, where L is the amount of money demanded, Y is gross domestic product, and i is the interest rate. If gross domestic product is $200 and the interest rate is 10 (percent), what amount of money will society want to hold?-$200-$320-$120-$160 Both the theory of comparative advantage in production and the H-O theory provide ______ as a basis for international trade.a. trade surplus theoryb. factor endowmentsc. managed trade theoryd. trade deficit theorye. foreign direct investment Give the measure of the angle that is complementary to the given angle. (Example 1) Given: G= (V,E), a diagraph where all vertex is a source or a sink, or both.Prove:G has neither self-loops nor anti-parallel edge. Star X has a smaller parallax angle than star Y. What can you conclude? A. 10 Star X is less luminous than star Y. B. Star X is more luminous than star Y. C. Star X is smaller in radius than star Y. D. Star X is nearer to Earth than star Y. E. Star X is farther from Earth than star Y. describe the various human and physical obstacles builders of hong kong's airport had to overcome. how were they able to overcome them? a mid to late 19th century german composer, conservative in his use of form, but not rhythm or harmony, in the mid and late 19th century was ____ ____ reports the cumulative amount of net income earned by the company less the cumulative amount of dividends since the corporation began. chain networks. personally addressed written communication. informational overload. impersonal written communication. rumor-based communication. Using ABC product cost information when considering reducing cost, which of the following would be recommended?a.Using an activity-based approach with multiple overhead allocation ratesb.Switching to a plantwide allocation ratec.Improving operations so that the activity-base usage per unit is increasedd.Improving operations so that the raw material usage per unit is eliminated Summary Planner: Two Roads, Chapter 22 Large-scale, long term storage is typically implemented with what kind of memory technology? a. Disk b. DRAM c. SRAM d. Does not matter. e. Flash a girl is 12years old now.what was her age x years ago?