opening and closing of the heart valves is caused by
Answers
Answer:
The pressure differences on either side of the valve.
Explanation:
The heart valves open and close passively because of pressure differences on either side of the valve. When pressure is greater behind the valve, the leaflets are blown open and the blood flows through the valve. However, when pressure is greater in front of the valve, the leaflets snap shut and blood flow is stopped.
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Related Questions
Which intestinal layer accounts for the action of the peristaltic waves?
A) serosa
B) muscularis
C) submucosa
D) mucous
Answers
The layer that accounts for the action of the peristaltic waves is the muscularis. These muscles contract rhythmically, causing the peristaltic waves that propel the food through the digestive tract.
Correct option is, B. muscularis.
Peristaltic waves are waves of muscular contractions that propel the food through the digestive tract. These waves occur in the layer of the digestive tract known as the muscularis. The muscularis is composed of two layers of smooth muscle, an inner circular layer, and an outer longitudinal layer.
The other layers of the intestine are: Serosa, Submucosa, and Mucous: Serosa: It is the outermost layer of the intestine and is made up of connective tissue and epithelial cells. Submucosa: The submucosa is a layer of tissue beneath the mucous membrane of the digestive tract. It contains blood vessels, nerves, and glands. Mucous: It is the innermost layer of the intestine. It secretes mucus which lubricates the walls of the intestine and protects it from damage.
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Which chloroplast structure increases the amount of surface area that is available for photosynthesis
Answers
Answer:
Thylakoid
Explanation:
A thylakoid is a sheet-like membrane-bound structure that is the site of the light-dependent photosynthesis
what do you mean by photo synthesis?
Answers
Answer:
the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.
Explanation:
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's metabolic activities.
Understanding the Immune System
A
is an agent that can cause infections and diseases.
Answers
in a lineage tracing experiment, investigators labeled a single cell in the dorsal neural tube with a fluorescent molecule in order to trace the fate of its descendants during development. it was found that all descendants of this labeled cell became pigment cells. what can be concluded about the state of determination of the labeled cell at the time of labeling?
Answers
Based on the results of the lineage tracing experiment, it can be concluded that the labeled cell was already determined to become a pigment cell at the time of labeling. This is because all of its descendants also became pigment cells, indicating that they inherited the same fate determination from the original labeled cell.
Cell fate determination refers to the process by which a cell becomes committed to a particular developmental fate, such as becoming a specific type of tissue or cell.
This determination can occur through a variety of mechanisms, including intrinsic factors such as gene expression patterns or extrinsic factors such as signals from neighboring cells or the environment.
In this experiment, the fact that all descendants of the labeled cell became pigment cells suggests that the determination to become a pigment cell had already occurred at the time of labeling.
This determination could have occurred through a variety of mechanisms, such as the expression of specific genes or exposure to extrinsic signals that directed the cell towards a pigment cell fate.
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help ASAP for brainlist and extra points
Answers
Answer:
C) DBAC
Explanation:
Answer:
BCAD
Explanation:
Amoeba Sisters: Cell Cycle and Cancer Video notes
All living things are made of cells is part of the
Functions of
our cells are regulated as part of something called the
Cells can grow and increase in size, however, a multicellular organism increases in size
through
Cancer partly comes from cells that
With some cancers, there may be
links, meaning it might run in
families. Other causes, in addition to genetics, may be exposure to
radiation, or excessive exposure to
from the sun's rays.
When cancer cells divide, it can give rise to a
Some of them stay put
but some do not. Treatments have been developed, such as radiation and
therapy that target cells that
rapidly.
Cells are in one of two different phases of the cell cycle:
-- where the cell is growing, replicating their DNA, and doing their cell
functions.
_- includes splitting of the DNA, cytoplasm, and dividing to make more
cells.
Cells spend most of their time in
which is made up of
(synthesis), and DNA is replicated in phase.
The cell cycle has checkpoints to make sure things are happening correctly, there is one
in one in and one in
There are many
_involved with regulating the cell cycle.
Some cells do not go through all of the phases. Some cells are in which is a
phase for cells, such as the cells in the
and spinal cord.
This is why damage to these organs can have challenges with healing, because many of
those cells may not be able to
Answers
Answer:
if u ask a tutor u can get the answer faster than having to wait on random people to answer your question for you
How does the narrator's view of Maxwell change over time?
Answers
Answer: ?
Explanation: Maxwell who?
First, formulate a question to answer through scientific investigation. Keep in mind that you should be able to answer your question with measurable data. Write your question here.
Answers
Answer:
What is the question supposed to be out any specific topic
Explanation:
The formulation of a question with respect to scientific investigation is as follows:
Why genetic engineering is boon for modern life?What is Genetic engineering?Genetic engineering may be characterized as a type of methodology that significantly utilizes a series of laboratory-based technologies in order to change the DNA makeup of an organism including humans.
In this modern world of science and technology, genetic engineering plays a crucial role in the development of medicine that include the manufacturing of drugs, the creation of model animals that mimic human conditions and genes, etc.
According to scientific investigations, the process of genetic enginerring is also used to design to help humans overcome many genetically undesired diseases or traits among organisms including humans as well.
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We know that for example stem Bromelain has an enzymatic activity of 0.542 U/mg and there are 20 billion bacteria in our teeth. Calculate how long does Bromelain take to degrade all of the biofilm created by the bacteria using this rule : a) Any assumptions must be written as "(Assumption)". Plus point for those who tell me why they choose that assumption b) Any other data gained from other sources must be written specifically. If it is a book, you can just write the title of the book and the page. If it is a source/website/journal, just write the title of it. c) If you write other data without stating that it is assumption or obtained from other sources, I assume that you create data by yourself without knowing anything!!
Answers
Given that Stem Bromelain has an enzymatic activity of 0.542 U/mg, and there are 20 billion bacteria in our teeth. We need to calculate how long it takes to degrade all of the biofilm created by the bacteria.Assumptions and explanations used in the calculation: Assumption: The mass of the biofilm is not given. Therefore, it is assumed that the biofilm's mass is 1 mg, as the enzymatic activity of bromelain is provided per mg. If the biofilm's mass is different, the result will be different.
We know the enzymatic activity of bromelain, which is 0.542 U/mg.We are given that the number of bacteria in our teeth is 20 billion. The biofilm is created by these bacteria. Bromelain is supposed to degrade the biofilm. Therefore, we need to calculate the mass of the biofilm. The mass of the biofilm is assumed to be 1 mg, as the enzymatic activity of bromelain is given per mg.Now we can use the given data to calculate the time required for bromelain to degrade all of the biofilms created by the bacteria.First, we need to find the total enzymatic activity required to degrade the biofilm. The mass of the biofilm is assumed to be 1 mg.Enzymatic activity of bromelain = 0.542 U/mgTotal enzymatic activity required to degrade 1 mg biofilm= 0.542 U/mg × 1 mg= 0.542 UThe total enzymatic activity required to degrade the biofilm created by the 20 billion bacteria is:Total enzymatic activity required= Enzymatic activity per bacteria × Total number of bacteria= 0.542 U/mg × 20 billion= 1.084 × 10^10 UTo find out how long it takes for bromelain to degrade all of the biofilm, we need to know the rate of degradation. The rate of degradation depends on various factors, such as temperature, pH, etc., which are not provided in the question. Therefore, it is impossible to calculate the time required for bromelain to degrade all of the biofilms created by the bacteria without knowing the rate of degradation. Thus, the answer cannot be calculated.
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Which of the following condensed general formulas represents alcohols?
A)ROR
B)RCOR
C)RCHO
D)ROH
E)RCOOH
Answers
Answer:
the answer is part d
Explanation:
(D) Roh
You are a research scientist studying bioluminescent bacteria (bacteria that can glow). You grow several plates of bacteria and give them a special chemical that you hypothesize will increase their luminescence, or brightness. You turn off the lights and use a device called a photometer to measure the light levels (in lumens) coming from each plate. You collect the following data:
Plate 1: 7 lumens, 6 lumens, 13 lumens
Plate 2: 4 lumens, 5 lumens, 7 lumens
Plate 3: 3 lumens, 6 lumens, 7 lumens
Plate 4: 5 lumens, 5 lumens, 8 lumens
Which of the following pieces of data is likely an outlier?
Answers
From the data, the plate that is probably an outlier is that of plate 1, where a value much above the average of the other plates occurred.
Plate 1: 7 lumens, 6 lumens, 13 lumensHow does the phenomenon of bioluminescent animals happen?Bioluminescence is the emission of cold, visible light by living organisms. It occurs in various organisms
bacteriafungialgae coelenterates molluscsarthropods fish, mainly in the marine environment. In the terrestrial environment it occurs in fungi, annelids, molluscs and mainly in insects.
With this information, we can conclude that from the data, the plate that is probably an outlier is that of plate 1, where a value much above the average of the other plates occurred.
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Describe how the water cycle moves water between the tree, the lake, and the sky in the picture below. Describe at least three of the water cycle processes you have learned about in the course. (10 points)
Answers
Answer:
The heat from the sun warms the water in the lake which evaporates and turns into water vapours. The water in the tree also rises into the atmosphere through a process, transpiration.
The water vapours rise into the atmosphere and forms clouds.
The water vapours in the clouds than condense into liquid water. Soon they'll get heavy and the water will fall down as rain, sleet, or snow.
Some of the rainwater sinks into the ground and is taken in by the roots of trees and plants.
This process keeps going on and on, and the water keeps shifting between the lake, tree and the sky.
PLEASE HELPPP ASAP> NO LINK OR UNRELATED ANSWERS
The Human Body in Space
NASA monitors the bodies of animals and humans to see how they react to extended periods in space. When the body is in space, it no longer has the strong pull of Earth’s gravity on it. Because the body’s systems normally function in the presence of gravity, NASA has been studying the effects of weightlessness on the body.
Weightlessness Takes a Toll
On Earth, the heart naturally pumps blood more forcefully to the upper body than to the lower body, where gravity helps the blood flow down. In space, the heart continues to pump the blood more forcefully to the upper body, but the balancing force of gravity does not pull the blood to the lower body. This uneven blood flow causes astronauts’ faces to become puffy and their lower bodies to become thin.
The shape of the spine also changes in space. Without the force of gravity pushing the vertebrae closer together, the spine stretches out and causes pain in some cases.
Another system affected in space is the body’s balancing system. To balance itself, the brain acquires information from the eyes, muscles and tendons, and a set of sensors (called the vestibular apparatus) in the inner ear. In space, the only balancing information that can be relied on enters through the eyes, so astronauts have difficulty moving around.
The most serious problem for astronauts, however, is bone loss. In space, the bones lose minerals, such as calcium, potassium, and sodium. The bone loss in the legs can be as high as ten percent, and even exercise does not completely solve the problem.
Laboratory in Space
With the completion of the International Space Station (ISS), NASA will be able to study some of the effects of long-term exposure to weightlessness. NASA also plans to expand its studies to better understand how the immune system is affected and how radiation, which is much greater in space,
affects humans. Radiation can pose serious health threats, including cancer and neurological damage.
Because people working together on the ISS will be in small spaces for long periods of time, NASA also plans to study how working in confined spaces affects astronauts’ personalities.
Infer What does NASA expect to gain by studying the effects of long-term space travel on the human body?
Answers
Answer:
Knowledge gained during the early years of human spaceflight indicated an adaptation to the new environment. While the empirical evidence was limited, the biomedical data indicated that microgravity alters the musculoskeletal, cardiovascular, and neurosensory systems.
1 Which description properly describes a step involved in cellular respiration? Glucose is broken apart, then the energy gained is transferred to the energy molecule. Carbon dioxide is combined with oxygen to make glucose. Water is divided into carbon dioxide and glucose. Oxygen is combined with the energy molecule to energize it. Question 2 What is the location within a cell where cellular respiration occurs? The cell membrane The chlorophyll The mitochondrion The cytoplasm Question 3 Which component is missing from the process of cellular respiration? Glucose + Oxygen → Carbon Dioxide + ________ + Energy Water Sugar Oxygen Carbon Question 4 Which of the following is a true statement about cellular respiration? Cellular respiration occurs only in plant cells. Cellular respiration occurs only in animal cells. Cellular respiration occurs in both plant and animal cells. Cellular respiration occurs in some plant cells and some animal cells. Question 5 During the process of cellular respiration, water becomes oxygen. True False Question 6 Which of the following is not evidence for the law of conservation of mass during cellular respiration? The total number of atoms when glucose and oxygen react stays the same when carbon dioxide and water are produced. C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + energy The products from cellular respiration are created from the same elements (carbon, oxygen, and hydrogen) that make up the reactants. Cellular respiration creates an energy molecule when glucose is broken down.
Answers
Glucose is broken down apart, then the energy gained is transferred to the energy molecules is correctly described the step involved in cellular respiration, hence options 1- A, 2- C, 3- A, 4- C, 5- false, 6- D are correct.
The process of cellular respiration involves the oxidation of biological fuels in the presence of an inorganic electron acceptor, such as oxygen, to produce large amounts of adenosine triphosphate, which is an energy containing compound.
The location of the cellular respiration is mitochondria. Cellular respiration occurs in both plant and animal cells.
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Try this!
Learning Task No.
1. Give one method of preserving meat
2. How do plastics thrown in waterways cause flood?
3. What is meant by biodegradable?
4. How many colors has a rainbow have
5. Why do fisherfolks catch more fish on a new moon?
6. Which do you prefer: meat or vegetables? Why?
7. What is a balanced diet?
8. How does the deforestation affect the population of eagles?
9. Should the government implement non-smoking in public places? Why or wh
10. How can we solve the water pollution in our community?
Direction: Write R if the statement is under recall questions and BR if beyond recall questions.
Research ang subject na to
wala lang po dito
Answers
Answer:
1. By refrigerating it(You can also add salt cuz salt acts as a preservative)
2. I have no clue
3. Biodegradable is a characteristic of an object which can decompose by the nature itself
4. Seven
5. Uhhmmm?
6. Both are necessary for a healthy diet (Also you haven't mentioned which meat) Meat like fish are good but mutton or chicken's meat are not specifically bad but you should try reduce the amount you eat
7. Kinda explained that in 6.
8. Population of eagles??????? It could reduce the population of birds but not really though. Well you mi6say birds live on trees but at the same time birds are not trees, the could just go to a far away place where human habitat is low or just migrate away
9. Yes it would be good. smoking does not only ruin the person who is smoking but also the people nearby.
10. Do it yourself
The male grouse makes a drumming noise by using its wings to beat the air. What is the behavior communicating?
Answers
Answer:echolocation i think
Explanation:
In which wedge of the two circle graphs do you observe the greatest difference between
the two regions?
Answers
Answer:
Explanation:
a.had to guess but there you go
a defensive mechanism observed in some sea cucumbers that involves the sudden expulsion of the gut and other internal organs through the mouth or anus is known as .
Answers
Evisceration is a defense strategy used by certain sea cucumbers that involve the abrupt evacuation of the gut and other internal organs through the mouth or anus.
The defensive mechanism observed in some sea cucumbers is known as evisceration. This is an adaptive survival strategy that helps the sea cucumber escape from predators or other dangers.
The mechanism observed in some sea cucumbers is called evisceration. This is a defense mechanism used by the sea cucumber to distract predators or remove parasites from its body.
When threatened, the sea cucumber will quickly expel its gut and other internal organs through its mouth or anus, effectively making itself less appetizing to the predator. The expelled organs can be regenerated over time.
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Why is evoultion considered a theory
Answers
Answer:
A scientific theory is a well-substantiated explanation of such facts. The facts of evolution come from observational evidence of current processes, from imperfections in organisms recording historical common descent, and from transitions in the fossil record. Theories of evolution provide a provisional explanation for these facts
Explanation:
Test and Improve
Part A
Janelle placed a thermometer in the plastic bag in her oven, and Corey placed a thermometer underneath the
plastic wrap in his oven. They placed their ovens out in the Sun for one hour. At the end of the hour, they recorded
the temperature in each oven.
Solar Oven
Janelle's cone oven
Corey's shoe box oven
Final Temperature (°F)
148
112
Identify the design that worked better. Was your prediction correct? Why do you think this design got hotter than
the other?
Answers
The better design is that of Janelle in which the thermometer was put in the plastic bag in her oven.
Which design would work better?We know that the oven is a device that was designed for the purpose of heating a substance. The heat would move all through the substnace thw we want to heat. In this case, we are usng a plastic to put the material that we want to heat.
It is natural that if we put the thermometer inside the plastic bag of underneath the plastic wrap in his oven, the thermometer that is wrapped in the plastic bag is going to have a better measurement because it can be able to pick the temperature that is right inside the wrap.
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which of the following is known as the process of natural selection associated with a population well adapted to its environment? a. genetic polymorphism b. stabilizing selection c. balanced polymorphism d. frequency-dependent selection e. directional selection
Answers
e. directional selection the following is known as the process of natural selection associated with a population well adapted to its environment .
What did the process of natural selection become known as?Natural selection, commonly known as "survival of the fittest," is the more prolific reproduction of individuals with advantageous features who survive environmental change as a result of those traits. This results in evolutionary change, with the characteristic becoming prevalent within a population.
Natural selection requires four conditions to occur: reproduction, inheritance, change in fitness or organisms, and diversity in individual characteristics among population members.
Natural selection holds that qualities that may be handed down assist animals to adapt to their environment better than other creatures of the same species. .
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When an organism excretes waste, can a plant directly use it as fertilizer (nitrogen source)? Why or why not?
Answers
Because the organism waste contains UREA and urea is rich in nitrogen and it can be used as fertilizer for plants. Bc plants need nitrogen.
When a life form excretes waste, plants can use it directly as fertilizer. As a result, it's correct.
What is a fertilizer?A fertilizer is any natural or synthetic material that is applied to soil or plant tissues to provide plant nutrients.
Fertilizers can be distinguished from liming materials or other non-nutritional soil amendments. There are numerous fertilizer sources, both natural and man-made.
It should be noted that nitrogen is a critical macronutrient required by many organisms, including plants. It is critical to their development.
Waste from organisms is permitted on plants, and this is necessary for their growth. As a result, when an organism excretes waste, the nitrogen content of the waste can be found in the waste and used as fertilizer for the plant.
Thus, the given statement is true.
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SOMEONE HELP I HAVE 51 ASSIGMENTS DOU BY WEDNES
How do mutations occur in the genetic code? This represents crossing over during meiosis.
a) During DNA replication, the original DNA strand GTC ACA GGC ATC is copied into complementary strand CAG CCG TAG. This is an example of deletion.
b)Mutations can only occur when passed on thorough reproduction. The majority of mutations are the result of exposure to mutagens.
c)A woman who has sickle cell anemia passes this disease on to her offspring. This means that the mutation for sickle cell anemia MUST occur in the woman’s gametes.
d)Mutations can be silent and not affect the organism that has them.
Answers
Answer:
I think correct answer is not given in the options provided.
Crossing over during meiosis is a process where homologous chromosomes exchange genetic material. It occurs during prophase I of meiosis and can result in genetic recombination, where the offspring receives a combination of genes from both parents.
Mutations can occur in the genetic code due to errors during DNA replication or exposure to mutagens such as radiation or chemicals. Mutations can be of various types, such as point mutations, deletions, insertions, and chromosomal rearrangements. Some mutations can have harmful effects, while others may have no effect or even be beneficial.
Therefore, the option (a) describes a normal process of DNA replication but does not represent crossing over or a mutation. Option (b) is partially correct but does not describe the specific process of mutation that occurs during crossing over. Option (c) is not necessarily true for all cases of sickle cell anemia as it can also occur due to mutations in the mother's somatic cells, not just the gametes. Option (d) is correct but does not provide any information about the specific process of mutation during crossing over in meiosis.
What do you consider to be your culture? How do you feel about it?
Answers
Answer:
My culture is my Jewish culture.
Explanation:
I feel great about it.
As a control for your sasquatch experiment, you place a fake deer in the forest. The role of this control in your experiment is to?
Answers
As a control for the sasquatch experiment, a fake deer is placed in the forest. The role of this control in experiment is to provide a basis of comparison to the experimental group.
Scientists often analyze hypotheses developed by them by means of controlled experiments. A controlled experiment is a scientific test performed under controlled conditions, denoting that only one or a few variables are altered at a time whereas, all the remaining variables are kept constant.
Controls are utilized in an experiment to reduce the effects of variables besides the one being tested. An experimental group is also sometimes referred to as a treatment group, which receives a treatment in an experiment.
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PLEASE I NEED HELP NOW!! this is from a Gizmo//Mutation and Selection, Compare the fitness to percentages to the insect colors. How does fitness relate to the color of the insects
Answers
It has been hypothesized that people who are heterozygous for the allele that causes the deadly genetic condition cystic fibrosis (which, among other symptoms, reduces fertility) are more resistant to the deadly disease tuberculosis. Q8. If the cystic fibrosis allele protects against tuberculosis the same way the sickle-cell allele protects against malaria, then which of the following should be true of a comparison between regions with and without tuberculosis? a) Cystic fibrosis deaths should be more common in the regions with tuberculosis. b) Cystic fibrosis deaths should be less commmon in the regions with tuberculosis. c) Cystic fibrosis deaths should be equally common in both types of regions. d) Regional differences in the cystic fibrosis death rate should be purely random and unpredictable.
Answers
b) Cystic fibrosis deaths should be less common in the regions with tuberculosis.
If the cystic fibrosis allele provides protection against tuberculosis, similar to how the sickle-cell allele provides protection against malaria, we would expect to see fewer cystic fibrosis deaths in regions with tuberculosis. This is because individuals who are heterozygous for the cystic fibrosis allele would have an advantage in resisting tuberculosis compared to those without the allele. The presence of tuberculosis in a region would select against the cystic fibrosis allele, leading to a lower frequency of cystic fibrosis deaths in regions where tuberculosis is prevalent.
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I have only two hats, a red one and a black one. I have only two
belts, a blue one and a white one. I have only two ties, one with a
DNA molecule prominently showing on it and the other with
2n promin
Answers
As per the details given, using probability there are 8 possible combinations of hats, belts, and ties.
You need to know the entire number of possible combinations and the total number of positive outcomes in order to determine the likelihood of a certain arrangement of hats, belts, and ties happening.
You may get the total number of combinations by multiplying the number of options for each item (hats, belts, and ties), as each has two options.
In this instance, you have two hat options (red or black), two belt options (blue or white), and two tie possibilities (DNA or 2n). Consequently, there are the following combinations in all:
2 (options for hat) * 2 (options for belt) * 2 (options for tie) = \(2^3\) = 8
Thus, there are 8 possible combinations of hats, belts, and ties.
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Your question seems incomplete, the probable complete question is:
I have only two hats, a red one and a black one. I have only two belts, a blue one and a white one. I have only two ties, one with a DNA molecule prominently showing on it and the other with 2n prominently showing on it. Every day I wear one hat, one belt and one tie, all chosen at random. How many possible combinations of hats, belts and ties exist?
Please can someone help me?
Answers
The given image is of Metaphase.
What is Metaphase?A phase of cell division known as "metaphase" (mitosis or meiosis). Individual chromosomes are typically dispersed throughout the cell nucleus.
The chromosomes of the cell condense and move toward one another, aligning in the center of the dividing cell, and the nucleus of the cell disintegrates during metaphase.
The chromosomes may now be identified when viewed under a microscope. In karyotyping, a laboratory method for detecting chromosomal abnormalities, metaphase chromosomes are utilized.
Therefore, The given image is of Metaphase.
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