Physical connections made during crossing over are necessary for the proper detachment of homologous chromosomes in meiosis.
DNA double-strand breaks (DSBs) can occur as a result of endogenous processes like DNA replication and repair as well as exogenous agents like radiation and specific chemicals. Cells purposefully create additional DNA double-strand breaks (DSBs) throughout meiosis in order to start homologous recombination, which accurately segregates chromosomes by exchanging genetic material between homologous chromosomes. A single-strand break can be repaired by using the unharmed strand as a template. Homologous recombination is a frequent form of repair for double-strand breaks. Two identical Genetic molecules exchange genetic material in this instance. Chemicals can be employed to undo the harm.
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EXTENDED RESPONSE
A single layer of smooth muscle encircles the walls of
blood vessels. The walls of the stomach and small
intestine have a layer of circular smooth muscle and
a layer of longitudinal smooth muscle.
Part A
How does the muscle arrangement of blood
vessels reflect the function of this structure?
Part B How does the muscle arrangement of the
stomach and small intestine reflect the func-
tion of these structures?
Tunica media is a thicker arterial wall layer which is mostly made up of smooth muscle cells. It forms the middle layer in blood vessels.
What is Smooth muscle cells?Smooth muscle cells regulate blood flow by constricting and dilating the blood vessels. This regulation is important for the efficient transport of gases and nutrients when reaches the capillary bed.
Due to having a large amount of smooth muscle cells, these arterioles play an important role in regulating the flow of blood between arteries and capillaries.
Therefore, Tunica media is a thicker arterial wall layer which is mostly made up of smooth muscle cells. It forms the middle layer in blood vessels.
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which surgical procedure replaces the femoral head and the acetabulum with a metal ball and stem?
Hip arthroplasty, also known as hip replacement, is a surgical procedure used to treat hip pain. Artificial implants are used during the operation to replace some of the hip joint.
The ball and socket that make up the hip joint are located at the top of the femur, also known as the thigh bone (in the pelvis, also known as the hip bone). One or both parts of the hip can be replaced during surgery to replace it. Your ability to resume daily activities and engage in physical activity with less pain is the procedure's main objective.
Chronic pain brought on by osteoarthritis, rheumatoid arthritis, post-traumatic arthritis, avascular necrosis, or childhood hip disease can be treated with total hip replacement surgery. By allowing the ball and socket to move freely, hip replacement procedures improve mobility and lessen pain.
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the upper layer of warm, less dense water is referred to as the the upper layer of warm, less dense water is referred to as the epilimnion. benthic zone. hypolimnion. thermocline.
The upper layer of warm, less dense water in a lake is referred to as the epilimnion. This layer is generally the warmest and most well-mixed part of the lake, and it is usually located near the surface.
The temperature of the epilimnion varies with the season, but it is generally warmer than the deeper layers of the lake.
The epilimnion is separated from the deeper, colder water by a layer called the thermocline. The thermocline is a narrow layer in which the temperature changes rapidly, and it marks the transition between the warm, well-mixed epilimnion and the colder, less well-mixed hypolimnion. The hypolimnion is the deepest layer of the lake, and it is usually the coldest and least well-mixed.
In addition to the epilimnion, thermocline, and hypolimnion, many lakes also have a benthic zone, which refers to the bottom sediments and the organisms that live there. The benthic zone is an important part of the lake ecosystem, as it provides habitat for many species and serves as a sink for nutrients and other materials that are transported from the surface of the lake.
Question: The upper layer of warm, less dense water is referred to as the
A.) thermocline.
B.) hypolimnion.
C.) epilimnion.
D.) benthic zone
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on isle royale in lake superior, moose are prey for wolves and hosts for a parasite known as the moose tick that causes them to lose fur. in this community, how does predation differ from the parasitic relationship?
Parasite and host population coevolve, whereas predator and prey populations do not. Hence, Option B is the correct answer.
What do we mean by parasite?
A mechanoreceptor cell found in the inner ear that responds to auditory stimuli. The arrangement of the accessory sensory structures ensures that the movement of the hair-like projections (stereocilia and kinocilia), which transmit information to the central processing unit of the nervous system, is triggered by the appropriate stimuli. The Organ of Corti, a sensory receptor located inside the cochlea, contains nerve receptors for hearing in sensory cells with hair-like structures (hair cells). The cochlea contains two fluids (endolymph and perilymph).
The Organ of Corti of the cochlea is a sensory organ that houses the hair cells that serve as nerve receptors for hearing.
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Scientific Method in Action 1 The Strange Case of Beriberi In 1887 a strange nerve disease attacked the people in the Dutch East Indies. The disease was beriberi Symptoms of the disease included weakness and loss or are Watims offen died of heart failure. Scientists with beribers. The injected chickens became sick. However, so did a group of chickens that were more information with bacteria grain rice, but during the experiment, the chickens were fed polished rice. Dr. Eijkman researched this One of the scientists, Dr. Eijkman, noticed something before the experiment, all the chickens had eaten whole interesting case and found that polished rice lacked thiamine, a vitamin necessary for good health 1. State the Problem 2. What was the hypothesis? Strange nerve disease attached People in Dutch East Indies The disease beriberi might be caused by bacteria They injected chickens with bacteria from the blood or patients 3. How was the hypothesis tested?
The hypothesis was tested by injecting chickens with bacteria from the blood of patients with beriberi, as well as feeding them polished rice lacking thiamine.
What is thiamine?A necessary nutrient that is important for the metabolism of carbohydrates, proteins, and fats is thiamine, usually referred to as vitamin B1. It is a water-soluble vitamin that the body cannot produce on its own; therefore, it must be received through food or supplements. Thiamine has a role in the synthesis of energy from food and is necessary for the healthy operation of the neurological system, heart, and muscles. Thiamine deficiency can result in a number of medical conditions, including beriberi, a condition marked by weakness, loss of appetite, and nerve damage. Whole grains, legumes, nuts, and meat are among the foods high in thiamine.
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acid rain damages trees in which of the following manners? group of answer choices removes soil nutrients dissolves roots causes bark to fall off
OptionA, removes soil nutrients. Acid rain does not directly damage trees. As a result, trees are more likely to become weaker by having their leaves damaged, having fewer nutrients accessible to them.
Acid rain damages trees by weakening them through a variety of means. Acid rain can damage leaves, which can lead to reduced photosynthesis and less energy for the tree to grow and defend itself. It can also wash away important nutrients from the soil, such as calcium and magnesium, which are necessary for healthy tree growth. Additionally, acid rain can release toxic substances from the soil, such as aluminum, which can further damage tree roots and limit their ability to absorb water and nutrients. Over time, these effects can lead to weakened trees that are more susceptible to disease and pests.
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The complete Question is:
Acid rain damages trees in which of the following manners?
A ) removes soil nutrients
B ) causes bark to fall off
C ) dissolves roots
Scientists use specific levels of organization to analyze the biosphere. Which level of organization describes a school of anchovies?
A school of anchovies. At least 20 fish can be seen swimming.
Which two events can happen in the absence of oxygen?
A.
The formation of water molecules
B.
The splitting of glucose molecules
C.
The formation of some ATP molecules
D.
The production of CO2 molecules
B. The splitting of glucose molecules and D. The production of CO2 molecules can occur in the absence of oxygen.
The formation of water molecules typically requires the presence of oxygen, as it is a product of the reaction between hydrogen and oxygen.
The formation of ATP molecules typically requires the presence of oxygen, as it is produced through cellular respiration, which is a process that involves the oxidation of glucose and the transfer of electrons to oxygen.
In the absence of oxygen, cells can resort to anaerobic respiration, such as fermentation, to produce some energy. During fermentation, glucose is split into simpler compounds, such as lactate or ethanol, and CO2 is produced as a byproduct.
small rna-containing particles for the synthesis of proteins
Protein synthesis is carried out by tiny RNA-containing particles called ribosomes.
What are ribosomes?The biological components known as ribosomes are in charge of protein synthesis. They consist of two subunits, a big and a small subunit, each of which is made up of proteins and ribosomal RNA (rRNA). Through a process known as translation, the ribosomes read the genetic code contained in messenger RNA (mRNA) molecules and use this knowledge to build amino acids into proteins. All living cells, including bacteria, archaea, and eukaryotes, include ribosomes. In eukaryotic cells, ribosomes are either free in the cytoplasm or attached to the endoplasmic reticulum, depending on whether the synthesized protein is destined for use within the cell or for secretion outside the cell.
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The small bulge at the end of the axon that sends messages to other neurons are called:_________
"Axon terminals" are the tiny protrusions at the end of axons that communicate with other neurons.
A neuron's axon is a long, slender projection that extends from the cell body and carries nerve impulses away to other neurons or muscles.
The axon terminal, also referred to as a terminal button, synaptic knob, or synaptic terminal, is a small, bulbous structure at the end of the axon.
Neurotransmitters, which are chemicals that transmit signals across synapse, the minuscule space between an axon terminal and the dendrites of other neurons, are kept in synaptic vesicles, which are found in the axon terminal.
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What organisms are considered super bugs because they are resistant to most commonly used antibiotics?
in an experiment, you have a tall plant that produces round peas. tall and round are dominant and the plant is heterozygous for both traits. the plant is then self-fertilized. what is the probability that a single offspring plant is tall and has wrinkled peas? express your answer as a decimal.
A plant in which tall and round are dominant and the plant is heterozygous for both traits, The probability that a single offspring plantis tall and has wrinkled peas is 0.1875.
The parental plant's genotype is TtRr since all od them possess heterozygous traits. The answer to this question can be determined in several ways. use a Punnett square or a ramification, but the result is the same. This crossed Punnett Square shows that 3/16 is likely large and wrinkled. Punnett squares are useful, but can be unwieldy for large numbers of features, so it's worth looking at ways to explore this using probabilities. Each allele has a half (0.5) chance of being passed on to the next generation. Using the product rule, we can calculate the probability of the large wrinkled phenotype. The genotypes that give the tall and wrinkled phenotype are:
TTrr, Ttrr, tTrr Probability of T and T and r and r = 0.5 x 0.5 x 0.5 x 0.5 (equivalent to 0.54) = 0.0625 (or 1/16) Ttrr is also 0.54 and tTrr is 0.54. The probability of any of these possibilities occurring uses the summation rule. H. Probability of TTrr or Ttrr or tTrr = 0.0625 + 0.0625 + 0.0625 = 0.1875.
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Which of the following would be good examples of genotype-by-environment interactions? Select all that apply.a. two different strains of corn that differ in height due to genotypeb. a strain of corn whose yield varies with the amount of nutrients in the soilc. two different mutants of mice that share similar fat metabolism abilitiesd. a line of dairy cows that increases milk yield in relation to feed amounte. a line of chickens whose eggshells are extra thick regardless of feed typef. a strain of mutant mice that becomes obese regardless of feed amount
The good example of genotype- by environment interaction are strain of corn whose yield varies with the amount of nutrients in the soil and line of dairy cows that increases milk yield in relation to feed amount.
InteractionFair-skinned folks are more susceptible to skin cancer from sunlight exposure than people with darker complexion. This is an illustration of the relationship between genotype and environment.The term "genotype by environment (G E) interaction" describes the variance in how different genotypes react to various surroundings (Falconer and Mackay, 1996). Due to scaling or re-ranking effects, there are two basic types of G E interaction.The phrase "genotype environment (GxE) interaction effect") refers to both the modification of genetic risk factors by environmental risk and protective factors as well as the function of specific genetic risk factors in determining individual differences in vulnerability to environmental risk factors.For more information on genotype-environment kindly visit to
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Carolus Linnaeus classified species based upon ________________ but not upon ______________
Carolus Linnaeus classified species based upon their physical and morphological characteristics but not upon their genetic makeup.
Linnaeus's classification system, known as binomial nomenclature, assigns a two-part scientific name to each species based on its physical features. The first part of the name represents the genus, which groups closely related species, genetic makeup and the second part represents the species. Linnaeus's system was based on the principle of morphological similarity, where organisms that look alike are considered to be closely related and belong to the same species. He believed that species were fixed entities, meaning that they did not change over time. However, this view was challenged by subsequent discoveries in evolutionary biology, genetics, and molecular biology. Despite this, Linnaeus's classification system remains a fundamental tool for organizing and naming the vast diversity of life on Earth.
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poured sand in a pan. which other material should ty add to the pan to model stream erosion
Answer:
water
Explanation:
because i said so.
Consider the elements, listed, found in the human body. Which two are major components, making up at least 3% each of the human body? hydrogen n cobalt selenium O magnesium O carbon
The elements hydrogen and carbon are two major components from the listed elements making up at least 3% each of the human body.
The human body is composed of six elements, including oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus, which account for around 99% of its mass. The remaining five elements, potassium, sulphur, sodium, chlorine, and magnesium, account for only about 0.85% of the total makeup. All 11 of them are required by life. The remaining elements are trace elements, of which more than a dozen are thought to be essential for life based on convincing evidence. The body mass of magnesium, the least abundant of the 11 non-trace elements, is not equal to the combined mass of the trace elements (less than 10 grammes for a human body).
Hence, The elements hydrogen and carbon are two major components from the listed elements making up at least 3% each of the human body.
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The major type of cell found in fibrous connective tissue is the:_________
The major type of cell found in fibrous connective tissue is the fibroblast.
Elongated, spindle-shaped cells called fibroblasts are essential for the development and upkeep of fibrous connective tissue. They are in charge of creating and arranging the extracellular matrix, which is made up of proteins like glycoproteins and fibers like collagen and elastin.
Additionally, fibroblasts play a role in tissue regeneration and wound healing. They proliferate and move to the site of harm when there is damage, where they produce proteins and other compounds that aid in healing and tissue regeneration. They also contribute to the regulation of the extracellular matrix by dissolving and eliminating worn-out or broken fibers and generating fresh ones.
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mitochondria and lysosomes carry out specific functions for the cell and are collectively called
Mitochondria and lysosomes carry out specific functions for the cell and are collectively called Organelles.
Inside cells, organelles are specialized structures that carry out a variety of tasks. Literally, the phrase refers to "tiny organs." Organelles provide specialized duties to keep a cell alive, just like organs like the heart, liver, stomach, and kidneys serve specific roles to keep an individual alive.
The mitochondrion, a large organelle also present in eukaryotic cells, is in charge of producing ATP, a substance used by living things as a source of energy. Many cells have hundreds of mitochondria.
These mitochondria feature an inner membrane that folds over several times to form a multi-layered structure known as cristae and an exterior membrane that encloses the organelle. The matrix, a substance that contains proteins and mitochondrial DNA, is the fluid that fills the mitochondria.
Other organelles like lysosomes are responsible for digesting and recycling toxic substances and waste. They are embedded with proteins called enzymes, which break down macromolecules, including amino acids, carbohydrates, and phospholipids.
Lysosomes are produced by a larger organelle called the Golgi complex, which manufactures other cellular machinery as well. Whenever a cell dies, it self-destructs using its own lysosomes.
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in the sense of alternation of generations, how many generations are included in a mature pine seed?
In the sense of alternation of generations, a mature pine seed contains only one generation - the sporophyte generation.
Pines, like all gymnosperms, have a life cycle that includes a dominant sporophyte generation, which produces haploid spores through meiosis. The spores develop into a small, haploid generation called the gametophyte. In pines, the gametophyte generation is reduced to a few cells and is contained within the seed, which is produced by the female sporophyte cone.
The male gametophyte in pines is the pollen grain, which is produced by the male sporophyte cone. When the pollen grain lands on the female cone, it germinates and produces sperm cells, which fertilize the egg cells of the female sporophyte cone. This produces the zygote, which develops into the mature sporophyte pine tree.
Therefore, in a mature pine seed, there is only one generation present - the sporophyte generation. The gametophyte generation is represented by a few cells contained within the seed, but it is not fully developed and does not function independently.
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the feather colour of a certain breed of chicken is controlled by codominant alleles. a cross between a homozygous black-feathered chicken and a homozygous white-feathered chicken produces all speckled chickens. what phenotypic ratios would be expected from a cross between two speckled chickens?
Option (D). The following phenotypic ratios would be expected from a cross between two speckled chickens - 1 black feathers : 2 speckled feathers : 1 white feathers.
A phenotypic ratio is a quantitative connection between phenotypes that indicates how frequently the frequency of one phenotype corresponds with the frequency of another. Phenotypic ratios obtained from test crosses are used when researchers wish to obtain generational gene expression of an organism.
Phenotypic ratio refers to the proportional number of offspring exhibiting a particular trait or combination of traits. In this scenario, the phenotypic ratio indicates the number of tall and short offspring according to genotype. The definition of phenotypic ratio is the ratio of different phenotypes present in the offspring of a cross. For example, if there are 3 apples and 2 oranges, the ratio of apples to oranges is 3:2
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Complete question :
The feather colour of a certain breed of chicken is controlled by codominant alleles. A cross between a homozygous black-feathered chicken and a homozygous white-feathered chicken produces all speckled chickens. What phenotypic ratios would be expected from a cross between two speckled chickens?
A. All speckled
B. 1 black feathers : 1 white feathers
C. Speckled, black feathers and white feathers in equal numbers
D. 1 black feathers : 2 speckled feathers : 1 white feathers
chordates possess several distinguishing characteristics that separate them from other animal groups. check all of the features that one would use to classify members into this phylum___A. Cnidaria: presence of nematocysts and radial symmetryB. This is sexual reproduction by way of parthenogenesis.C. pharyngeal slitsnotochorddorsal hollow nerve cordpostanal tailD. They are serially repeated in the segments of the body.
The features that one would use to classify members into the phylum Chordata are C. Pharyngeal slits, notochord, dorsal hollow nerve cord, postanal tail.
Chordates are characterized by the presence of these four features during some point of their life cycle. The pharyngeal slits are openings in the pharynx that are used for filter feeding or respiration in aquatic forms. The notochord is a stiff rod that provides support and helps to define the main axis of the body. The dorsal hollow nerve cord is a tubular structure that runs along the dorsal side of the body and develops into the central nervous system. The postanal tail is a tail that extends beyond the anus and is used for locomotion in aquatic forms.
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i need help as fast as possible
Answer:
2 common ancestor: The most recent ancestral form or species from which two different species evolved.
PLS ANSWER QUICK HELP
The story of the finches and the tale of the African elephant both demonstrate how species can evolve and adapt to changes in their environment.
The finches on the Galapagos Islands are a classic example of natural selection and adaptation. Observed by Charles Darwin during his travels, the finches on the islands displayed a range of beak sizes and shapes, each adapted to a specific food source. Over time, genetic mutations occurred that allowed some finches to develop longer or shorter beaks, better suited for cracking open hard seeds or reaching nectar from flowers. This adaptation helped the finches to access a wider range of food sources and to survive in changing environmental conditions. The change in the ecosystem that drove the evolution of the species was primarily driven by changes in food availability, as the plants on the islands varied in the types and hardness of their seeds.
In the case of the African elephant, the species has also evolved in response to environmental changes. Over millions of years, elephants have developed larger ears, tusks, and trunks, which are adaptations that have helped the species to cope with changing temperatures and to find food and water. For example, larger ears help to dissipate heat and cool the body. At the same time, tusks and trunks are useful for breaking through tough vegetation and reaching food sources that would otherwise be inaccessible. The change in the ecosystem that drove the evolution of the species was caused by a variety of factors, including changes in climate and food availability, as well as the competition for resources from other species.
In both cases, the stories of the finches and the African elephant demonstrate how species can evolve and adapt to changing environmental conditions, allowing them to survive and thrive in their habitats.
The amount of oxygen in a person's blood decreases. How will the body respond
Answer:
Explanation:
Hypoxia is low levels of oxygen in your body tissues. It causes symptoms like confusion, restlessness, difficulty breathing, rapid heart rate, and bluish skin. Many chronic heart and lung conditions can put you at risk for hypoxia. Hypoxia can be life-threatening.
Imagine an invertebrate that lives in an estuary where salinity varies cyclically with the tides. If this individual is able to adjust the salt concentration of its body fluids, its salt concentration will have:____.
If the invertebrate living in an estuary can adjust the salt concentration of its body fluids, its salt concentration will have relatively constant despite the cyclic changes in salinity caused by the tides.
This ability to regulate salt concentration, known as osmoregulation, is essential for organisms living in environments with fluctuating salinity levels. Depending on the invertebrate species and its physiological adaptations, it may be able to maintain a constant internal salt concentration by actively transporting salts in and out of its body or by excreting excess salts through specialized structures. The ability to osmoregulation is critical for the survival and functioning of many aquatic organisms, including those living in estuaries.
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please help!!!! (k12)
the classification of organisms is called(1 point) responses evolutionary biology. evolutionary biology. ecology. ecology. taxonomy. taxonomy. anatomy.
The classification of organisms is called taxonomy. Taxonomy is the science of naming, characterizing, and classifying creatures, and it encompasses all of the world's plants, animals, and microorganisms.
Taxonomy is the scientific study of naming, defining and classifying groupings of biological species based on similar traits. It is derived from the Ancient Greek 'arrangement' and -o 'method'. Taxa are groupings of organisms that are assigned a taxonomic rank; groups of a given rank can be aggregated to produce a more inclusive group of higher rank, resulting in a taxonomic hierarchy.
In modern botany, the main ranks are domain, kingdom, phylum (division is often used instead of phylum), class, order, family, genus, and species.
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Full Question: The classification of organisms is called(1 point) responses
evolutionary biology.. ecology. taxonomy. anatomy.Answer:
the answer is taxonomy
Explanation:
bar graph showing all the organic compounds in an egg.
The organic compounds in an egg are: Fat: 33%, Protein: 18%, Carbohydrates: 0.03%, Cholesterol: 0.2%, Vitamins: 5%, Minerals: 5%, Triglycerides: 16%, Phospholipids: 17%, Other: 6%
What is organic compounds?
Organic compounds are compounds that contain at least one carbon atom. They can be found in both living and non-living things, such as in plants, animals, and even rocks and soil. Organic compounds are essential for life, as they make up proteins, carbohydrates, and other molecules that are necessary for life. They are also important for many industrial processes, such as in the production of plastics, rubbers, and drugs. Organic compounds are made up of molecules that contain carbon, hydrogen, and other elements, such as oxygen and nitrogen.
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Fill The Blank? the space between the parietal layer and visceral layer of the pericardium contains ______.
The space between the parietal layer and visceral layer of the pericardium contains pericardial fluid.
The fibrous sac that covers the heart is known as the pericardium. The fibrous pericardium, parietal pericardium, and visceral pericardium are the three layers that can be distinguished from one another. Serous pericardium is comprised of the parietal and visceral pericardia. The serous pericardium has two layers that run continuously across one another.
The outer layer of serous (parietal) pericardium lines the inner surface of the fibrous pericardium. The outside of the heart is covered in the inner (visceral) layer of the serous pericardium. The serous pericardium's two layers are separated by the pericardial cavity, which houses the pericardial fluid. In addition to lubricating the two layers and enabling the heart's contraction and expansion, this fluid also acts as a lubricant.
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Where does ribosome assembly occur in the nucleus?
