Comets are composed of ice and dust because they are remnants from early solar system composed of materials that have remained unchanged since the formation of solar system about 4.6 billion years ago.
Why are comets composed of ice and dust?The ice in comets is believed to be made up of water, with smaller amounts of other volatile compounds like carbon dioxide, methane, and ammonia. The dust in comets is composed of materials including silicates and metals that formed into solid particles.
Early solar system was a cold place, and materials in the outer regions of solar system, where comets are thought to have originated were never heated enough to vaporize and this allowed water and other volatile compounds to freeze into ice and the solid particles combined to form the dust.
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Which of these statements is true about the gametophyte tissue that surrounds the pine embryo?
A. It develops from the fusion of a microspore and a megaspore.
B. It functions as a diploid food reserve.
C. It functions as a triploid food reserve.
D. It functions as a haploid food reserve.
E. It is the remnant of the pollen tube.
An embryo sac is another name for a megagametophyte (female or egg-producing gametophyte). The embryo sac develops within an ovule, which is found within a flower's ovary.
The mature embryo sac is a seven-celled, eight-nucleate structure in most angiosperms. Megagametogenesis is the process by which megagametophytes mature and evolve. Megagametophytes are responsible for the production of female gametes, or eggs. These egg cells are required for pollination and fertilization. The megagametophyte of gymnosperms and the endosperm of angiosperms, which are formed before and after fertilization and have haploid and triploid genomes, respectively, may be thought of as functional homologues due to their functions as a source of nutrients for the growing embryo.
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bioinformatics most typically analyzes what cellular macromolecules?
Bioinformatics is an interdisciplinary field that applies computational methods and tools to analyze and interpret biological data.
One of the primary types of biological macromolecules that bioinformatics typically analyzes is nucleic acids, specifically DNA and RNA.
Bioinformatics tools are used to analyze the structure and function of nucleic acids, including the sequence of nucleotides in DNA and RNA, the expression patterns of genes, and the interactions between genes and their products. This information is used to study gene expression, genetic variation, gene function, and the evolution of genes and genomes.
In addition to nucleic acids, bioinformatics can also be used to analyze and interpret data related to proteins, including their sequence, structure, and function, as well as their interactions with other molecules. This type of analysis is often referred to as structural bioinformatics or protein bioinformatics.
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went’s experiment differed from all previous plant tropism experiments by
Went experiment differed from all previous plant tropism experiments by "Unequal distribution of elongation promoting chemical in Avena coleoptile"
F. W. Went discovered that the elongation of the Avena coleoptile stops when the tip is severed. But when auxin was administered externally, the plant's growth was restored. According to his interpretation of the results of the trials, auxin is produced at the coleoptile tip and then moved towards gravity. It switches between the lit and the darkened sides. The shaded side has more auxin than the illuminated side. This causes the plant to slant towards the light source and grow more on its shadowed side. Positive phototropism is evident, with the lighted side exhibiting less cell elongation and the shaded side exhibiting faster cell elongation. Therefore, "Unequal distribution of elongation promoting chemical in Avena coleoptile" is the right response.
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cardiac muscle tissue contains fewer mitochondria than are found in skeletal muscle tissue. true/false
Answer:
true
I hope it helps....
name 4 of the five most common molecules (these are small inorganic molecules, not biomolecules) on prebiotic earth, the raw materials for the primordial soup (the starting solution of the miller-urey experiments).
Four of the five most common small inorganic molecules found on prebiotic Earth, which were also used in the famous Miller-Urey experiment to simulate conditions for the origin of life, are water, methane, ammonia, and hydrogen gas.
The fifth most common molecule was thought to be molecular hydrogen, but recent studies suggest that carbon monoxide or carbon dioxide may have been more abundant than previously thought.
The Miller-Urey experiment was conducted in the 1950s by Stanley Miller and Harold Urey to investigate the origins of life on Earth. The experiment involved simulating the conditions of the early Earth in a closed system, which included water vapor, methane, ammonia, and hydrogen gas, and subjected the mixture to an electric discharge to simulate lightning.
After a week of the experiment, the researchers observed the formation of several organic compounds, including amino acids, which are the building blocks of proteins. This experiment provided evidence that organic molecules could arise spontaneously from simple inorganic precursors under the conditions thought to have existed on the early Earth.
The most common inorganic molecules found on prebiotic Earth were water, methane, ammonia, and hydrogen gas. These molecules were likely produced by geological and atmospheric processes, such as volcanic activity and the breakdown of atmospheric gases by ultraviolet radiation. These molecules were thought to have been the building blocks of the primordial soup, the hypothetical mixture of organic and inorganic molecules that served as the starting point for the origin of life on Earth.
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Systematists have used a wide variety of characters to reconstruct the phylogenies of particular groups of organisms. which one of the following types of characters can produce an estimate of phylogeny?
1. behavioral characters
2. DNA sequences
3. protein sequences
4. morphological characters
All the above characters combined can produce an estimate of phylogeny.
Phylogenetic trees represent hypotheses about the evolutionary relationships among a group of organisms. A phylogenetic tree may be built using morphological (body shape), biochemical, behavioral, or molecular features of species or other groups. In building a tree, we organize species into nested groups based on shared derived traits (traits different from those of the group's ancestor). A phylogenetic tree may be built using morphological (body shape), biochemical, behavioral, or molecular features of species or other groups. In building a tree, we organize species into nested groups based on shared derived traits (traits different from those of the group's ancestor). The methods of constructing phylogenetic trees include the distance-based methods, parsimony, maximum likelihood, and Bayesian inference methods . The data used in reconstruction of a DNA-based phylogenetic tree are obtained by comparing nucleotide sequences
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which term is used to describe an inherited trait that gives an organism an advantage in its particular environment?
Adaptation is used to describe an inherited trait that gives an organism an advantage in its particular environment.
In general , the adaptation is considered as the heritable changes that helps an organism, like plant or animal, that helps to survive and reproduce in its environment. Hence , Adaptation is the process in which a species becomes stable and able to survive in its environment as a result of natural selection's also works in taking up heritable variation over several generations.
Also, adaptation is known as a physical or behavioral feature in animal that make them suitable to survive in environment they are living. In other words, an adaptation is needed for the survival for any species.
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what is the scientific name for the northern lights?
The northern lights, also known as aurora borealis, are a magnificent, multicolored light show that can frequently be seen in the northern hemisphere's night sky.
The aurora australis, or southern lights, are the name for auroras that occur in the southern hemisphere. Due to their proximity to Earth's magnetic poles, the northern and southern lights are both polar lamps, or aurora polaris. A truly breathtaking natural occurrence, polar lights (aurora polaris) can be seen in the both northern and southern hemispheres. The scientific name for the northern lights is aurora borealis, and the name for the southern lights is aurora australis. Thankfully, they happen frequently. Landlord of the northern lights tour operator Lights Over Finland and photographer Chad Blakely said, "The lights are happening twenty-four hours a day, seven days per week, 365 days a year."
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2/2/2018Suppose the stereocilia of one hair cellbecome permanently bent. What willmost likely happen as a consequence?Why only a single pitchand not many pitches?A.A single pitch will be constantly perceivedB.A single pitch will no longer be perceivableC.A or B depending on the hair cell’s locationD.A or B depending on the bending’s direction
If the stereocilia of one hair cell become permanently bent, the most likely consequence is that a single pitch will no longer be perceivable.
This is because each hair cell in the inner ear is responsible for detecting a specific frequency or pitch of sound. If the stereocilia on a hair cell are damaged or bent, the hair cell may no longer be able to respond to the particular frequency it was responsible for, which can result in a loss of sensitivity to that frequency.
The reason why only a single pitch is affected is because hair cells are arranged in a tonotopic map, meaning that they are organized based on their preferred frequency. This means that hair cells that respond to higher frequencies are located at one end of the cochlea, while hair cells that respond to lower frequencies are located at the other end. Therefore, if the stereocilia on a hair cell at a particular location are damaged, it will only affect the perception of the frequency corresponding to that particular location in the cochlea.
Overall, the loss of sensitivity to a single pitch is a common consequence of hair cell damage or loss, which can occur due to a variety of factors such as aging, noise exposure, or certain medical conditions.
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What is the name of the scientists who determined the structure of DNA?
The discovery in 1953 of the double helix, the twisted-ladder structure of deoxyribonucleic acid (DNA), by James Watson and Francis Crick marked a milestone in the history of science and gave rise to modern molecular biology.
They quickly gained revolutionary understanding of the genetic code and protein synthesis as a result of their discoveries. It supported the development of innovative and potent scientific methods in the 1970s and 1980s, particularly recombinant DNA research, genetic engineering, rapid gene sequencing, and monoclonal antibodies, which served as the foundation for the multibillion dollar biotechnology industry that exists today. The mapping of the human genome, the development of modern forensic science, and the as-yet unrealized promise of gene treatment are all examples of significant recent scientific advancements that were all sparked by Watson and Crick. Not only has the double helix changed biology, but it has also become a cultural icon, appearing in jewelry, toys, sculptures, and other works of art.
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pipets are used to measure and dispense small amounts of liquids. you should draw the liquid into the pipet using your mouth. true/false
Pipettes are used to measure and dispense small amounts of liquids. You should draw the liquid into the pipette using your mouth. The given statement is true.
A pipette is a laboratory tool used to transport a predetermined amount of liquid, often as a media dispenser, in chemistry, biology, and medicine.
Pipettes are typically used to move small amounts of fluid or to measure and dispense liquid in milliliters. Micropipettes are more precise and subscriber when trying to measure less than 1 mL.
Pipets are instruments that measure and distribute small amounts of liquid. Using your mouth, draw the liquid into the pipette.
Even if the facilitator is not present, laboratory work can begin immediately after entering the laboratory. Never detach chemicals or other laboratory equipment.
Thus, the given statement is true.
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What are the 7 carbon transfers (fluxes)? (Will give brainly to 1st correct answer)
Answer:1. photosynthesis
2. respiration
3. decomposition
4. combustion
5. burial and compaction
6. carbon sequestration
7. weathering
Explanation:
Which statement best describes why scientific models change over time?
A. Models are constantly improved and refined as new information is
discovered.
B. Models change over time because scientists cannot agree on how
to represent their ideas.
C. Models are changed when enough people decide they want to
represent an idea in a different way.
D. Models are changed because people cannot understand models
from the past.
SUBMIT
Scientific models change over time because models are constantly improved and refined as new information is discovered, hence option A is correct.
What is a scientific model?Models change when scientific understandings change since they are representations of these understandings. The main concept of Science investigates the growth of scientific understanding.
They might have analog and digital models that can be improved over time by taking into account fresh scientific information.
Therefore, models are constantly improved and refined as new information is discovered best statement.
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what is the ability to move a body part through a full range of motion?
The capacity to move the joints in their whole range of motion. Flexibility refers to the capacity to move all or a portion of the body swiftly.
Flexibility refers to your ability to move your body's components across their whole range of motion. If your basketball injury has caused you to lose knee mobility, this implies you can't move it very well. Mobility frequently refers to the ability to move an injured bodily part, such as a joint or limb, but it can also apply to movement in general. relocation Add to the list Share.
Use the term relocation to indicate moving from one location to another, such as a family move that required them to leave behind old acquaintances but provided them with the opportunity to meet new people.
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What can be inferred from observed similarities in the forelimbs of humans, dogs and bats?A. These organisms share a common ancestor.
B. The animals share a similar ancestor.
C. The similarities in their body structures
D. Pig and human
Answer: answer is A
Explanation:
What is the advantage of having small, needlelike leaves?
A) better protection against insects and herbivores
B) decrease in transpiration rate
C) decreased efficiency of light capture
D) increase in transpiration rate
E) increased efficiency of light capture
Conifers and cacti, which have tiny, needle-like leaves, provide various benefits:
Reduced water loss: The surface area via which water can be lost through transpiration is reduced in tiny leaves. When water is scarce in dry or arid areas, this adaptation is especially crucial.Needle-shaped leaves may be an adaptation to colder climates, where big leaves may become destroyed by freezing temperatures. Additionally, the small size of needle-like leaves enables more effective gas exchange in cold climates.Protection from herbivores: Because of their rough texture and frequently sharp tips, needle-like leaves might repel herbivores. This helps guard against eating or harming the plant.Greater exposure to sunshine: The arrangement of small, needle-like leaves frequently maximizes the amount of light that each leaflet receives. This is especially helpful in low-light conditions, like the woodland understory.The ability to thrive in locations where other leaf varieties may be less suited to the conditions is the main benefit of having short, needle-like leaves.
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how many homunculi are present in the primary somatosensory cortex?
There are two homunculi present in the primary somatosensory cortex.
One homunculus represents the left side of the body and is located on the right side of the cortex, while the other homunculus represents the right side of the body and is located on the left side of the cortex.
These homunculi are content loaded how the brain processes sensory information from different parts of the body. Each homunculus is a distorted representation of the body, with larger areas of the cortex devoted to more sensitive parts of the body, such as the hands and face.
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Calculating the volume of a Rectangular Prism
Find the volume of a box with a length of 5 cm, a width
of 5 cm, and a height of 10 cm.
V=
cm?
10 cm
5 cm
5 cm
Intro
Done
The volume of a rectangular prism with a length of 10cm, a width of 5cm, and a height of 8cm is 500[tex]cm^{3}[/tex].
In general, if a rectangular prism has a length of l units, a width of w units, and a height of h units, we may calculate its volume using the formula:
lwh = volume
In other words, we calculate the volume of a rectangular prism by multiplying its length, width, and height. Our rectangular prism's length, width, and height are stated as 10cm, 5cm, and 10cm, correspondingly. As a result, we may calculate our volume by multiplying these numbers together.
10cm 5cm 10cm Equals 500[tex]cm^{3}[/tex] volume
The volume of our rectangular prism is calculated to be 500cm3.
A rectangular prism with a length of 10cm, a width of 5cm, and a height of 10cm has a volume of 500[tex]cm^{3}[/tex].
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Complete Question is:
What is the volume of a rectangular prism with length of 10cm, the width of 5cm and a height of 10cm?
Under what conditions would the butterflyfish be unable to adapt to the change in the food sourcer
The reef butterflyfish is well suited to life on the reef. Its compressed body allows for darting in and out of coral. The small, protractile mouth is specifically adapted to crevice feeding.
Chemoreceptors in the carotid and aortic bodies detect all of the following except...
A) oxygen levels
B) blood pressure
C) pH
D) carbon dioxide
E) both A and D
B) blood pressure is not detected by the chemoreceptors in the carotid and aortic bodies
What are chemoreceptors?Chemoreceptors are specialized sensory cells or neurons that respond to chemical stimuli in the environment or in the body. They can be found in different parts of the body, such as the nose, tongue, and blood vessels, and play important roles in detecting and signaling changes in the chemical composition of their surroundings.
For example, chemoreceptors in the nose help us sense and identify different odors, while chemoreceptors in the blood vessels help regulate blood pressure and pH by detecting changes in oxygen, carbon dioxide, and other chemicals in the blood.
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Which feature of cycads makes them similar to many angiospers?
1. they have exposed ovules
2. they have flagellated sperm
3. they are pollinated by animals
They have exposed ovules. Ovules are a feature that cycas share with angiosperms. Each plant is either all male or entirely female. The presence of ovules is what causes the similarity to angiosperms.
Gymnosperms like cycas have enclosed seeds with more intricate fertilisation systems, whereas cycas have unfertilized seeds that are open to the air to be directly fertilised by pollination.
Cycas often use a single species of very specialised pollinators. They are frequently identified by their thick, wooden trunk and crown of big, stiff, evergreen leaves. Usually, their leaves are pinnate.
Gymnosperms , as opposed to angiosperms (which have enclosed seeds with more complicated fertilisation mechanisms), have unfertilized seeds that are exposed to the air to be directly fertilised by pollination.
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a hospital lab received an order to perform a blood typing paternity test. the test includes abo, rh, and mn typing. how would the lab report these services?
If a hospital lab received an order to perform a blood typing paternity test. the test includes ABO, Rh, and MN typing. the lab report these services as a 86900, 86901.
The CPT (Current Procedural Terminology) code for ABO blood typing is 86900, and the CPT code for Rh blood typing is 86901. Both of these codes are used for blood typing laboratory procedures and are appropriate for reporting ABO and Rh blood typing services.
MN typing is usually combined with ABO and Rh typing and is not reported separately. As a result, the codes 86999 (unlisted haematology procedure) and 86911 (red blood cell antigen typing) are inapplicable for reporting the services in this case.
So, the lab would report CPT codes 86900 and 86901 for the ABO and Rh typing, respectively, to indicate that these tests were performed as part of the paternity test.
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CORRECT QUESTION SHOULD BE
A hospital lab received an order to perform a blood typing paternity test. The test includes ABO, Rh, and MN typing. Report these services for the facility.
a. 86910
b. 86900, 86901
c. 86900, 86901, 86999
d. 86911
what term is used to describe the direction of movement from the occipital lobe to the cerebellum?
The cerebellum is needed to maintain balance through postural modifications. In order to account the changes in body position or differences in the strain on muscles, the instructions to motor neurons.
What other names are given to the occipital lobe?Brodmann area 17, also known as visual area V1, is another name for this region. The primary visual system communicates information about location, spatial information, motion, or the colours of objects within the field od vision after receiving sensory data from the retina of the eye of the eyes.
What functions does the occipital lobe perform?At the back of the skull, the occipital lobes control visual perception, includes colour, form, and motion. These are some examples of occipital lobe damage: Locating objects in the surroundings is difficult. colour identification challenges (Colour Agnosia).
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How do meiosis 1 and 2 contribute to genetic variation?
During meiosis II, when the sister chromatids separate and are dispersed at random among the offspring cells, the gametes, there is a third source of genetic variety. Meiosis I crossover results in non-identical chromatids in meiosis II chromosomes.
In germ cells, a process called meiosis is used for cell division. The paternal and maternal chromosomes' haphazard alignment during meiosis I can result in variance. Variation is also brought about by the sharing of genetic information across homologous chromosomes. Genetic diversity is also produced in meiosis II by the sister chromatids' haphazard orientation. Independent assortment and crossing over are two mechanisms that contribute to genetic variation in meiosis. During metaphase of meiosis I, a distinct collection of homologous chromosomes occurs.
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the structure of the spleen and lymph nodes are composed mainly of
The structure of the spleen and lymph nodes are composed mainly of Reticular loose connective
The spleen is the body's biggest lymphatic organ. The spleen is made up of two types of tissue: white pulp and red pulp. It is surrounded by a connective tissue capsule that continues inside to split the organ into lobules. The white pulp is lymphatic tissue made up primarily of lymphocytes that surround arteries.
Lymph nodes are made up of lymph tissue and other types of cells, such as white blood cells (lymphocytes). Lymph nodes and other lymphatic organs such as the spleen and thymus contain lymphocytes, which are unique white blood cells. These may rapidly proliferate and produce antibodies in response to bacteria, viruses, and a variety of other stimuli emitted by dead or dying cells, as well as improperly behaving cells such as cancer cells.
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Full Question
The structure of the spleen and lymph nodes are composed mainly of ______-
______ are essential chemical substances that must be consumed for normal cellular metabolism and growth.
The missing term in the sentence is "nutrients". Nutrients are essential chemical substances required by living organisms to maintain normal cellular metabolism and growth.
Nutrients include carbohydrates, lipids, proteins, vitamins, and minerals. Carbohydrates are the primary source of energy for the metabolism body, lipids are used for energy storage and structural support, and proteins are necessary for growth, repair, and maintenance of body tissues. Vitamins and minerals , nutrients are required in small amounts for various physiological functions in the body, such as bone formation, immune function, and energy production. Without metabolism adequate nutrient intake, the body may suffer from malnutrition and impaired functioning.
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Fluid mosaic model of membrane structureWhich of the following is true of the fluid mosaic model of membrane structure?A)Membranes behave more like a solid than a liquid.B)Lipids can flip from one leaflet to another as easily as they can move laterally in a membrane.C)Proteins can easily move across membranes.D)Proteins can easily move laterally through membranes.
The answer choice that best fits the question is D) Protein can travel lateraly through membranes with ease.
What does a membrane look like?Mullerian Membranes The body openings that access to the outside are lined with these membranes, also known as mucosae. Mucous membranes line the inside of the digestive tract. Additional examples are the respiratory, reproductive, and excretory systems.
What is a membrane, exactly?All cells have a cell membrane, also known as a plasma membrane, which separates the cell interior from the external environment. The cell is a membrane that surrounds which is optically transparent. The cell membrane regulates the flow of substances from and to the cell.
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the effects of genetic drift are more pronounced in smaller populations. t/f
False, the effects of genetic drift are more pronounced in smaller populations.
One of the factors that leads to evolution is genetic drift, which is an abrupt and haphazard process. Allele frequency fluctuates as a result of genetic drift. This alteration could be brought on by the bottleneck effect, population migration or emigration, or some other factor (when some calamity causes destruction of most of the members and only a few members survive). Additionally, the founder effect may be to blame (some members of the population segregate themselves and live as a separate population).
Due to the relatively low genetic variability in these populations, even slight changes in the allelic frequency can have a significant impact on the population. Small populations are more susceptible to genetic drift.
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in foxes, two alleles of a single gene, p and p, may result in lethality (pp), platinum coat (pp), or silver coat (pp). what phenotypic ratio is obtained when two platinum foxes are bred together? is the p allele behaving dominantly or recessively in causing (a) lethality; (b) platinum coat color? why?
The two platinum foxes will breed an offspring. The coating will be platinum gold. The entity will behave in a recessive way.
The mutation dominant by homozygous P would, although, lead to the fatality of an individual or an affected person, but in regards to the Punnet Square, a combination involving two heterozygotes (platinum fox) will indeed yield in or produce an offspring or progeny.
With regards to the three surviving prospects, it is indeed apparent that the two of them will be covered in platinum gold while the other one would have a silver coating. In order to preserve validity, the dominant faction or entity is functioning in a recessive way. Whenever you are dealing with two entities or when you need to put in a significant effort to develop a certain prototype, then that's what you are concerned with.
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according to the histological pictures of an artery and vein in the blood vessels chapter of the lab manual, which is characteristic of the vein?
The statement that is true about veins is: Veins have valves; arteries do not. Veins are blood vessels that carry blood towards the heart, while arteries carry blood away from the heart.
Compared to arteries, veins have a larger diameter lumen and thinner walls, which make them less elastic and more distensible. Additionally, veins have a lower pressure than arteries, which means they require some mechanism to prevent the backflow of blood. This is where valves come into play - veins have one-way valves that prevent blood from flowing backward, helping to maintain proper blood flow and circulation. In contrast, arteries do not have valves because the blood is under higher pressure and flows continuously in one direction. Overall, veins play an important role in the circulatory system by returning blood back to the heart and are equipped with valves to ensure proper blood flow.
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The complete Question is:
Which of the following is true about veins?
Veins have a smaller diameter lumen than arteries.
Veins are more muscular than arteries.
Veins carry blood away from the heart, while arteries carry blood to the heart.
Veins have valves; arteries do not.
