3) Scientists who have examined the fossil record have noted that some species have changed very little over long
periods of geologic time. The lack of change in such organisms is most likely because
A) the environment that they lived in remained the same, and they were well-adapted to it
B) all members of their population were genetically identical, and they lived in a rapidly changing
environment
C) there was a large amount of variation in their population, and the environment changed frequently
D) they could move between different environments when food supplies became scarce

Answers

Answer 1

Answer:

The correct answer is option A) "the environment that they lived in remained the same, and they were well-adapted to it".

Explanation:

One of the basis of evolution is that species that face new environmental conditions tend to develop new traits to survive. The opposite applies to species that have lived in constant environmental conditions, these species are usually well-adapted and have changed very little over long periods of geologic time. Some species of tortoises are examples of animals that had changed very little in their evolutionary history. The hard shells of tortoises is an ancient adaptation that help them to survive in constant environmental conditions.

Answer 2

The lack of change in organisms in some species examined by scientist is most likely because A) the environment that they lived in remained the same, and they were well-adapted to it

What is adaptation?

Adaptation can be regarded as the biological mechanism whereby organisms adjust to new environments or to changes in their current environment.

Therefore, the reason why some species have changed very little over long periods of geologic time is due to adaptation.

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Related Questions

What is the function of the lysosome in the cell?
OBreaks down cellular waste
O Produces glucose
O Synthesizes proteins
O Stores food, water, and wastes
HELP PLEASE HURRY!!!!!!

What is the function of the lysosome in the cell?OBreaks down cellular wasteO Produces glucoseO Synthesizes

Answers

Answer:

They break down cellular waste

1.Compare the replication strategy of +RNA viruses and retroviruses.
2.Distinguish between a viroid and a prion in terms of structure and host.
3.Explain the following statement: Animal viruses can use different strategies to enter and exit host cells.

Answers

Positive-stranded RNA ((+)RNA) viruses and retroviruses both use RNA as their genetic material, but they have different replication strategies.

How are the +RNA and retroviruses different ?

(+)RNA viruses can directly translate their RNA into proteins, while retroviruses must first reverse transcribe their RNA into DNA. This DNA is then integrated into the host cell's genome, where it can be used to produce new viruses.

Viroids and prions are both infectious agents, but they have very different structures and hosts. Viroids are small, non-coding RNA molecules that can replicate themselves in host cells. Prions are misfolded proteins that can cause other proteins to misfold, leading to cell death. Viroids infect plants, while prions infect animals.

Animal viruses can use different strategies to enter and exit host cells. Some viruses use endocytosis, in which they are engulfed by the host cell's membrane. Others use fusion, in which they fuse their own membrane with the host cell's membrane. Still others use penetration, in which they inject their genetic material into the host cell using a needle-like structure called a capsid.

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unlike sulfolobus, some archaea use ___________ protein(s) to accomplish cytokinesis.

Answers

Some archaea use ESCRT (endosomal sorting complexes required for transport) protein(s) to accomplish cytokinesis.

Archaea are a group of single-celled microorganisms that share many characteristics with bacteria and eukaryotes. One of the essential cellular processes is cytokinesis, which is the division of the cell cytoplasm during cell division. In the case of Sulfolobus, a type of archaea, cytokinesis is achieved through the use of a contractile actin-like protein called Cdv. However, other archaea use the ESCRT system to complete cytokinesis. The ESCRT machinery is a highly conserved eukaryotic system involved in endosomal sorting, which has been repurposed in some archaea to fulfill the function of cytokinesis.

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What are 10 nursing diagnosis?

Answers

Ineffective breathing pattern

Acute pain

Risk for infection

Imbalanced nutrition

Ineffective tissue perfusion

Fatigue

Ineffective coping

Anxiety

Risk for impaired skin integrity

Disturbed sleep pattern

The first of the ten nursing diagnoses is an

1. inefficient breathing rhythm.

2. Severe pain

3. Infection danger

4. An unbalanced diet

5. Poor tissue perfusion

6. Tiredness

7. Poor coping techniques

8. Stress

9. Potential for reduced skin integrity

10. An irregular sleep pattern

Nursing Diagnosis DefinitionNANDA International (2013) defines a nursing diagnosis as a clinical assessment of an individual, family, group, or community's susceptibility to a particular human reaction to health conditions or life processes.The problem and its definition, the cause of the problem, and its distinctive features or risk factors must all be included in a nursing diagnosis. The patient's present health issue is described in the problem statement, along with the nursing actions required to provide for the patient.

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One way carbon dioxide enter the atmosphere

Answers

by burning fossil fuels

What is the theory of spontaneous generation? Please give an example. Thanks!!!

Answers

Answer:

cell theroy Explanation:

they used to think cells just until the discoverd  cells come from pre existing cells

2) O DNA e o RNA são os quais se formam a partir de Estes são constituídos por um ácido fosfórico, um açúcar e uma base nitrogenada. No DNA, o açúcar constituinte é a enquanto que no RNA é a Três das cinco bases nitrogenadas existentes são encontradas em ambos: a adenina, a guanina e a citosina. A base nitrogenada que ocorre apenas no e a que ocorre apenas no RNA é a DNA é a Qual das alternativas abaixo completa corretamente as lacunas da frase anterior? A)Acidos nucleicos; nucleotídeos; desoxirribose; ribose; timina; uracila. B)Nucleotideos; ácidos nucleicos; ribose; desoxirribose, timina; uracila. C)Acidos nucleicos; nucleotideos; ribose; desoxirribose; uracila; timina. D)Nucleotideos, ácidos nucleicos, ribose; desoxirribose; uracila; timina. E)Acidos nucleicos; nucleotídeos; desoxirribose; ribose; uracila; timina. MATEMATICA (MARCIA)

Answers

Answer:

E) Nucleic acids; nucleotides; deoxyribose; ribose; uracil; thymine.

Explanation:

Os dois tipos de ácidos nucléicos são DNA e RNA, eles são formados a partir de nucleotídeos. O açúcar no DNA é a desoxirribose, enquanto no RNA é o açúcar ribose. A sequência de bases nitrogenadas para o DNA é adenina, tiamina, cinina e gianina, enquanto para o RNA é uracila, cinina e gianina.

FILL THE BLANK.
diploidy is first re-established following _____. group of answer choices

Answers

Diploidy is first re-established following fertilization. So, option A is accurate.

Fertilization is the process in which the male and female gametes (sperm and egg) fuse to form a zygote. During fertilization, the haploid sperm and egg combine their genetic material, resulting in the formation of a diploid zygote. The zygote then undergoes subsequent cell divisions and development, giving rise to an embryo with diploid cells. This marks the re-establishment of diploidy, as the embryo inherits a complete set of chromosomes from both parents. The other options mentioned, such as gastrulation (formation of the three primary germ layers), spermatogenesis (formation of sperm cells), and organogenesis (formation of organs), are important processes in embryonic development but do not directly involve the re-establishment of diploidy.

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The complete question is:

FILL THE BLANK.

Diploidy is first re-established following _____. group of answer choices

A) fertilization

B) gastrulation

C) spermatogenesis

D) organogenesis

Which of the following will be observed in a food product that is being dehydrated?

A) Solute concentration in the food increases
B) Boiling point elevation
C) Freezing point elevation
D) Both A and B are correct

Answers

Solute concentration in the food increases and Boiling point elevation will be observed in a food product that is being dehydrated.

What is boiling point elevation?

A solution's boiling point is always higher than that of the pure solvent. As we add non-volatile solutes in a pure solvent, the boiling point rises. The quantity of solute particles, not the composition of those particles, determines how high the boiling point will rise. The increase in boiling point for diluted solutions is proportional to the molal concentration of the solute. A colligative property, a solution's boiling point elevation is determined by the quantity of solute molecules present rather than by their makeup.

What is concentration in food?

Before final dehydration in a spray or freeze drier, the concentration process is typically used as a pre-treatment to lower the initial moisture content of various commodities like milk, tea, or coffee. By freezing or sterilizing the product, such as frozen orange juice or evaporated milk, the bulk can be reduced.

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What do these images model?
A atoms
в compounds
C elements
D mixtures

Answers

Answer:

b

Explanation:

compounds

Nervous Structures
1 Injuries, from broken bones to paper cuts, are common occurrences for
people of all ages. Fortunately, the body has an amazing capability to heal
itself-with one big exception. The nervous system is famously tricky to heal.
The structures of the nervous system are vital to how information is sent and
received throughout the body, and they are quite delicate. Unfortunately,
injuries to certain parts of the nervous system cannot heal at all. However,
other parts of the nervous system once believed unable to heal actually can.
In fact, research shows that scientists are getting closer to understanding
how to improve the nerve-healing process.
What is the text about?
It is about the parts of the nervous system and how they work together.
It is about how different genes affect recovery from nerve damage.
It is about how the peripheral nervous system heals from injury.
It is about common causes of damage to the central nervous system.

Answers

Answer:

it is about common causes of demage to the central nervous system

It discusses typical reasons why the central nervous system gets hurt.

What causes harm to the brain and spinal cord?

A car accident, sports injury, fall, stroke, ruptured brain aneurysm, lack of oxygen, gunshot, or explosive blast are just a few of the potential causes. Traumatic brain injuries and traumatic spine injuries are common names for these wounds.

What causes nerve injury most frequently?

Traumatic injuries, infections, metabolic issues, genetic reasons, and exposure to toxins are all potential causes of peripheral neuropathy. Diabetes is one of the most typical causes. Most often, those who suffer from peripheral neuropathy report their pain as stabbing, burning, or tingling.

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26. Evolutionary relationships can be used to answer what kinds of questions?​

Answers

Answer:

To build phylogenetic trees, scientists must collect character information that allows them to make evolutionary connections between organisms. Using morphologic and molecular data, scientists work to identify homologous characteristics and genes.

Explanation:

Answer: structural similarities. factors that help determine evolutionary relationships: these similarities show that species are closely related and may have evolved from a common ancestor.

How long do employers need to keep the records for OSHA Bloodborne Pathogens Standard training?
For at least three years.

Answers

The employers need to keep the records for OSHA Bloodborne Pathogens Standard Training for at least three years.

The terms OSHA stands for Occupational Safety and Health Administration. It is an agency in the United States whose mission is to ensure health safety of all the workers in their working environments. The act OSHA was passed in the year 1970.

Pathogens are the microorganisms that can invade a living body and cause diseases. They can be bacteria, viruses, fungi, parasites, etc.  Blood borne pathogens are those that are specifically present in the blood. The example include HIV, HBV, HCV, etc.

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A patient got infection with an unknown bacteria. The microbiologist from the pathological lab isolated the causative bacteria which can be called as a. Psychrofiles b. Barophiles c. Thermophiles d. Mesophiles

Answers

The microbiologist from the pathological lab isolated the causative bacteria which can be called mesophiles (Option D).

Cаusаtive agent meаns аny virus, bаcterium, fungus, pаrаsitic аgent or microorgаnism which is directly or indirectly responsible for cаusing the аpplicаble diseаse. The causative bacteria isolated from the patient's infection could be classified as psychrophiles, barophiles, thermophiles, or mesophiles. These terms refer to different categories of bacteria based on their preferred environmental conditions. Further analysis and testing would be needed to determine the exact classification of the isolated bacteria.

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What is the number of neutrons in a helium atom?​

Answers

The number of neutrons in a helium atom is TWO (2).

Helium (He) is the second chemical element in the periodic table.

Helium consists of two (2) protons and two (2) neutrons in its atomic nucleus.

In consequence, the atomic number of helium is equal to two (2).

The Sun contains approximately 25% He, which is generated by solar fusion.

In conclusion, the number of neutrons in a helium atom is TWO (2).

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Answer:

\(\huge\boxed{\bf\: Number \: of \: neutrons = 2}\)

Explanation:

Here, we need to find the number of neutrons present in a Helium atom.

Helium comes right after Hydrogen as the second element in the Modern Periodic Table. This means that, the atomic number of Helium is 2.

We know that, atomic number = number of protons / number of electrons  . So, the total number of protons in Helium is also 2.

The atomic mass of Helium = 4 u.

According to the formula,

Atomic mass = Sum of the nucleons (neutrons + protons)

4 = neutrons + 2

4 - 2 = neutrons

2 = neutrons present in a Helium atom.

•°• The total number of neutrons present in a Helium atom is 2.

\(\rule{150}{2}\)

What is the number of neutrons in a helium atom?

extravasation of immune cells depends on choose one: a. antibody production by b cells. b. increased permeability of endothelial cell junctions. c. down regulation of selectin proteins on endothelial cells. d. increased vasoconstriction.

Answers

Extravasation of immune cells depends on to choose one:  increased vasoconstriction.

The smallest unit which could stay on its own and that makes up all dwelling organisms and the tissues of the frame. Mobile has 3 main components: the cellular membrane, the nucleus, and the cytoplasm. The mobile membrane surrounds the cellular and controls the materials that go into and out of the mobile. A cell has 3 fundamental parts: the mobile membrane, the nucleus, and the cytoplasm. The cellular membrane surrounds the cell and controls the substances that pass into and out of the mobile. The nucleus is a structure within the mobile that contains the nucleolus and most of the cell's DNA. it's also wherein maximum RNA is made.

Cells offer structure and function for all residing things, from microorganisms to people. Scientists recollect them the smallest form of existence. Cells house the organic equipment that makes the proteins, chemical compounds, and indicators answerable for the whole lot that occurs interior our bodies.

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Spontaneous mutations in human genetic material cause a wide variety of diseases, including?

Answers

Spontaneous mutations in human genetic material cause a wide variety of diseases, including cancer and genetic disorders.

Mutations can happen during DNA replication or due to various other environmental factors. Genetic mutations may cause diseases or disorders due to changes in protein synthesis or gene expression.

Spontaneous mutations are those that occur naturally without any external factor involved. They occur in the genetic material of an organism or species. Spontaneous mutations may occur during DNA replication or cell division, or due to other factors such as ionizing radiation, endogenous damage from cellular metabolism, and replication errors.

Spontaneous mutations that occur during DNA replication are usually corrected by DNA repair mechanisms.

However, some mutations may escape the correction process and become permanent. Such mutations can cause a variety of diseases and disorders in humans.

One of the most common types of mutations that lead to diseases is the genetic mutation.

Spontaneous mutations that occur in germ cells may be passed on to offspring and can cause genetic disorders such as cystic fibrosis, sickle cell anemia, or Huntington's disease.

Mutations that occur in somatic cells can cause cancer.

Therefore, the correct answer is cancer and genetic disorders.

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The cells that rhythmically and spontaneously generate action potentials in the heart are called ___

Answers

The cells that rhythmically and spontaneously generate action potentials in the heart are called  pacemaker cells

The pacemaker cells are the ones that help in the maintenance of the action potential and that action potential work as an electrical clock that provides the automaticity to coordinate the pacemaker cells it divides the action potential into 4 phases among which in phase 4 the ion channels open that conducts slow, inward ( depolarizing Na+ ) currents and they are called as funny currents which cause the membrane potential to spontaneously depolarize, thereby initiating phase 4 and at the -50mV T type Ca 2 + channels open and further depolarize the cells and in some way, L type Ca+ channel opens when membrane reaches -40mV and this further results in the more Ca+ enter to depolarize the cell further until an action potential threshold is reached.

At phase 0 depolarization is primarily caused by increased Ca+ current through L-type channels that began to open toward the end of phase 4.. In contrast, the T-type channel's Ca+ current slows as these channels close and in phase 3 K+ channels open thereby increasing the outward directed hyperpolarizing K+ winds and decreases the inward of Ca+ and hyperpolarization takes place and then again enter in phase 4 hence the pacemaker cells maintain the action potential by dividing and circulating in 3 different phases.

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in a particular variety of corn, kernel corn is controlled by a single gene with two alleles. the dominant allele results in purple kernels, and the recessive allele results in yellow kernels. a single corncob may contain
hundreds of individual kernels, each of which is the result of a separate fertilization event. what would the frequency of yellow kernels be that result from a cross between two heterozygous plants?

25%
0%

75%

50%

Answers

The frequency of recessive yellow beans resulting from a cross between two heterozygous plants is 25%.

What are recessive alleles?

Recessive alleles differ from dominant alleles in not being able to express themselves in heterozygotes. These alleles are only expressed in the phenotype if they are present in pairs, that is, they must be in homozygosity.

With this information, we can conclude that the frequency of recessive yellow beans resulting from a cross between two heterozygous plants is 25%.

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iv. Describe how radon would most likely enter the house in the diagram.

Answers

Answer:

Radon is an odorless, invisible, radioactive gas naturally released from rocks, soil, and water. Radon can get into homes and buildings through small cracks or holes and build up in the air.

Explanation:

2. Curly hair is recessive (s), and straight hair is dominant (S). A woman with curly hair (ss) marries a man who is a true breeder for straight hair (SS). What percentage of their children will have curly hair, and what percentage of them will have straight hair?





% Curly-

% Straight-

Answers

Curly 0%
Straight 100% or
Curly 25% and straight 75%
Curly -50
Straight-50

Pls help me
1:__Cu20 + ___C ↠__Cu + ___CO2

2:___ Na + ___O2 ↠ ___ Na2O
3:___ C2H4 + ___ O2 → ___ CO2 + ___ H2O
4:___ C4H10O + ___ O2 ↠ ___ CO2 + ___ H2O

Answers

Answer:

                 

Explanation:

What is the theory that active faults with few earthquakes in the past will have strong ones in the future?

Answers

Answer:

Gap hypothesis

Explanation:

This is because gap hypothesis states that the active fault displaces over a long period of time any part must be equal to what is experienced by all the other parts of the fault. These active fault that have fewer earthquakes at will present are mostly like to have stronger earthquakes in the Future.

Ian was on schedule to arrive in Dubai on time. The sky above him and the earth below him were both pitch black. Only his navigation screen and the occasional fireworks display illuminated the darkness. Considering the fact that it was the 50th anniversary of Earth declaring its independence from the Interstellar Alliance, traffic was light.
Though Ian was not terribly excited about going to Dubai, he was excited about attending his great-grandmother's birthday party. The plan was for Ian and his mother to meet up for supper at a restaurant in the Burj Dahlgren tower and then go to the party together. Ian had not seen his mother since she began speculating on Martian real estate a year and a half earlier. He was nervous.
Upon seeing Burj Dahlgren in the distance, Ian took his car off autopilot and began working his way down to the densely packed streets.
When he arrived at the tower, Ian was greeted by Ryuichi, the valet, whom he had not seen in nearly six months. Ryuichi informed him that his mother had already arrived and was waiting for him on the 160th floor.
Upon arriving on the 160th floor, Ian found his mother already seated. As soon as he sat down, she began the exchange of pleasantries. "So, how was graduation?" she asked. "I desperately wanted to be there, but business on Earth's newest suburb is troublesome. With fewer and fewer people immigrating to Mars every month, the housing market is stagnating." Failing to elicit a response, she changed the subject to Dubai's collection of late-20th and early-21st century architecture. Then, she desperately chatted about the news and the economy and the upcoming elections and even her favorite new restaurant before conversation dried up entirely. Ian and his mother, sitting at opposite ends of the table, spent the rest of the meal in silence.
Ian's mother did not say anything about his post-graduation plans, but she could sense impending change. Of course, she would be happy to continue supporting him in any way she could for the rest of his life, but, on more than one occasion, Ian had made it clear that he neither needed nor wanted her support.
After supper, they headed to his great-grandmother's birthday party, which was taking place in her apartment on the 57th floor of Burj Dahlgren.
Upon arriving at the party, Ian milled around by himself, looking for his great-grandmother. He found her waiting for him in a spare bedroom. Before he could open his mouth to say "hello," she screamed, "What are you doing in Dubai? It's your graduation night; you should be spending it with your friends, not at an old lady's birthday party."
"Well . . ." he said weakly, not knowing how he was going to finish his sentence.
"Well, nothing!" his great-grandmother replied with mock indignation. "You shouldn't be here, but I am glad you are because I have something I've wanted to give you for a long time." She walked over to a closet, reached in, pulled out a beat up brown bag with tarnished metal buckles, and then handed it to Ian, saying simply, "This bag belonged to my great-grandfather."
After running his fingers across the flap that closed the bag—feeling all the scratches and nicks in the material—Ian, who was only familiar with the smooth surfaces of synthetic fibers, asked, "What's it made out of?"
His great-grandmother stood in silence for a few seconds, thinking about how she would explain it to him, and then said, "It's made out of something called leather, which was made from the skin of animals that have long been extinct, but that isn't important. What is important is that it belonged to my great-grandfather who left Mexico with nothing but that bag. He told everybody that he was going to conquer the world, and though he didn't quite achieve his goal, he did make a name for himself independent of his family. When I was your age, I didn't realize what a burden the family name was, and because of that, I didn't try to escape it. I just want to make sure that you don't make the same mistake I did."
Ian stammered, producing nothing but an incoherent string of syllables. His great-grandmother's gift and the accompanying speech did not give him the confidence to strike out on his own; rather, they served to highlight the overwhelming expectations with which his family name saddled him. Once he collected his thoughts, Ian looked into his great-grandmother's eyes and asked, "How am I going to find a place where people have never heard the name Dahlgren?"

12
What is the main idea of the passage?
A.
Ian does not want people to treat him the same as everybody else.
B.
Ian is afraid of spending his life in his family's shadow.
C.
Ian does not want his friends to know who his family is.
D.
Ian is embarrassed of his mother and great-grandmother.

Ian was on schedule to arrive in Dubai on time. The sky above him and the earth below him were both pitch

Answers

Answer:  B. Ian is afraid of spending his life in his family's shadow.

Explanation:

do robots respond to their enviroment?

Answers

Answer: Yes

Explanation: Yessss

Which of the following is an example of wind
erosion?
A. A cold wind front moves in and significantly lowers the
temperatures of a region
B. Wind picking up and blowing away the topsoil of a section of
land
C. The feeling of wind pushing against you as you ride a bike
D. A strong wind blows and knocks over a tree
Comht0-2021 celle Comoration. All Rights Reserved.

Answers

Answer:

I'm pretty sure the answer is B! Hope this helps:]

Identity how the addition of acetyl groups to stones leads to a weaker association of DNA in nucleosomes. a Positively charged histones are able to interact with negatively charged phosphate groups of the DNA backbone. Addition of acetyl groups to histone heads weaken this interaction by reducing the positive charge on histones b Negatively charged histones are able to interact with positively charged phosphate groups of the DNA backbone. Addition of acetyl groups to historietails weakens this interaction by reducing the negative charge on histones c Positively charged histones are able to interact with negatively charged phosphate groups of the DNA backbone. Addition of acetyl groups to histone tails weakens this interaction by reducing the positive charge on histones. d Negatively charged histones are able to interact with positively charged phosphate groups of the DNA backbone. Addition of acetyl groups to histone heads weakens this interaction by reducing the negative charge on histones

Answers

The correct answer is: (c) . Positively charged histones are able to interact with negatively charged phosphate groups of the DNA backbone. Addition of acetyl groups to histone tails weakens this interaction by reducing the positive charge on histones.

Histones are proteins that play a crucial role in packaging DNA into a compact and organized structure called chromatin. DNA wraps around histone proteins to form nucleosomes, which are the basic repeating units of chromatin.

Histones have positively charged amino acids, such as lysine and arginine, that interact with the negatively charged phosphate groups of the DNA backbone through electrostatic interactions. This interaction helps in stabilizing the association between histones and DNA.

When acetyl groups are added to the histone tails, this process is known as histone acetylation. Acetylation involves the addition of acetyl groups to specific lysine residues on the histone tails. Acetylation neutralizes the positive charge on the histones, reducing their affinity for DNA.

As a result, the weakened interaction between histones and DNA allows for a more relaxed and open chromatin structure. This increased accessibility of DNA is associated with gene expression because it allows transcription factors and other regulatory proteins to bind to the DNA and initiate gene transcription. In other words, histone acetylation is generally associated with the activation of gene expression.

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What happens when electrons inside an
atom get excited“?
A. They stay in their current energy
level
B. They jump down an energy level
and absorb energy in the process
C. They jump up an energy level and
release energy in the process

Answers

Answer:

C. they jump up an energy level and release energy in the process

Explanation:

when electrons are excited, the move up a shell to share or give electrons

Organisms have changed over time; new species have appeared while other species have gone extinct. This is a description of.

Answers

Answer:

Sympatric.

Explanation:


What is the name for a group of individuals of the same species living
together in the same area at the same time?
A. Growth
ОО
B. Population
C. Resources
D. Animals

Answers

Answer:

population is the right answer.

Population is the answer
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