The ability of an organism to live, reproduce, and pass on its favourable qualities to its progeny in its environment is what Darwin's theory of evolution refers to as being "fittest."
What exactly does Darwin mean by "fittest"?The phrase "survival of the fittest," popularised in Charles Darwin's fifth edition of On the Origin of Species (published in 1869), argued that animals most adapted to their environment have the best chances of surviving and procreating.
What does Darwin define as an organism's fitness?Only reproductive fitness is meant by Darwin's fitness. A different sort of organism has the ability to enter and drive out the local population in a struggle for the limited resources.
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place steps in order
1. Pioneer species, such as lichen and moss, enter the soil-less area.
What is Pioneer?Pioneer is a term used to describe someone who is the first to explore or settle in a new area or field. Pioneers are typically characterized as people who are adventurous, risk-taking, and ambitious. They are often the first to discover new lands, develop new technologies, or introduce new ideas. Pioneers have shaped the history of the world, paving the way for future generations. They have been credited with establishing new industries, creating new forms of government, and even discovering new species of animals and plants. In short, pioneers are people who are not afraid to take risks and explore the unknown.
2. Pioneer species help break down rocks present to form soil.
3. Grass species move into the area.
4. Herbaceous plants and small shrubs enter the area.
5. Small trees and evergreens become established.
6. Climax community of deciduous hardwood tree species becomes established.
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medical management of arthropod-borne virus (arboviral) encephalitis is aimed at
The medical management of arboviral encephalitis caused by arthropod-borne viruses is aimed at reducing symptoms and preventing complications by supportive care, monitoring vital signs, and addressing difficulties.
It is important to monitor patients closely for neurological changes and provide appropriate interventions. Additionally, preventative measures such as mosquito control and vaccination programs may be implemented to reduce the incidence of arboviral encephalitis. Treatment may include antiviral medications, pain relief, and supportive care. Difficulties can arise due to the viral which may be dealt with hydration, fever control, pain relief, and treatment of seizures or other neurological symptoms, as there is currently no specific antiviral treatment available for most arboviral encephalitis cases.
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The small spaces that house the osteocytes and chondrocytes are called _____.
(a) lacunae
(b) canaliculi
(c) perforating canal
(d) cartilage.
The small spaces that house osteocytes and chondrocytes are known as lacunae. The Correct option is A
These spaces are found in both bone and cartilage tissues and serve as a dwelling place for the bone or cartilage cells. In bone tissue, osteocytes occupy the lacunae, while in cartilage tissue, chondrocytes occupy them. The lacunae are connected to each other and to the bone or cartilage surface through small channels called canaliculi.
These canaliculi allow for the exchange of nutrients and waste products between the cells and the surrounding tissue. The perforating canals, however, are channels that run perpendicular to the surface of the bone and allow blood vessels and nerves to penetrate the bone tissue, providing the cells with nutrients and removing waste. Cartilage is a connective tissue that provides cushioning and support between bones.
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smoking diminishes ciliary action and eventually destroys the cilia.truefalse
Smoking reduces ciliary function and ultimately leads to cilia destruction. True.
Smoking reduces ciliary function and ultimately leads to cilia destruction. The thoracic wall is lined by parietal pleura. The typical person's lungs have 500 ml of residual volume. The lung loses its ability to ventilate due to atelectasis (lung collapse). Red blood cells release oxygen as blood passes through the capillaries in our metabolizing tissues.
A higher temperature reduces hemoglobin's affinity for oxygen. Hemoglobin releases oxygen as its affinity declines and it is exposed to higher temperatures in the metabolizing tissues. The untrue claim regarding alveolar ventilation is that. It takes place in the skeletal muscle. Instead, it takes place in the lungs, a tissue made of elastic and connective tissue.
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3. the abdominal wall is located _____ superiorly _____ to the intestines
Explanation:
The abdominal wall is located superiorly (above) and anteriorly (in front of) the intestines.
the g-protein is activated following the interaction of a photon with an opsin. question 7 options: a) vision b) transducin c) olfactin d) gustin
The G-protein that is activated following the interaction of a photon with an opsin is called transducin (option B).
Opsins аre the universаl photoreceptor molecules of аll visuаl systems in the аnimаl kingdom. They cаn chаnge their conformаtion from а resting stаte to а signаlling stаte upon light аbsorption, which аctivаtes the G protein, thereby resulting in а signаlling cаscаde thаt produces physiologicаl responses. This process of cаpturing а photon аnd trаnsforming it into а physiologicаl response is known аs phototrаnsduction.
The G protein (guаnine nucleotide-binding protein) or trаnsducin is the signаl trаnsducing molecule thаt mediаtes аnd relаys the signаl from the light sensing rhodopsin. It is the molecule thаt trаnsduces light stimuli into more fаmiliаr chemicаl signаls for the cell. Аll oculаr systems function through the signаlling cаscаde initiаted by а G protein. The G protein is а heterotrimeric protein thаt is аctivаted by the exchаnge of guаnine nucleotide, GDP to GTP, induced by rhodopsin.
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The coelom is a fluid-filled cavity that forms completely within the ______ during embryonic development of some bilaterally symmetrical animals.
During the embryonic development of some animals with bilateral symmetry, the coelom is a cavity filled with fluid that forms completely within the mesoderm.
Coelomates are animals whose body cavities are lined with mesoderm germ layer tissue and are filled with fluid. This lined-body depression is known as a genuine coelom. Coelomates are addressed by numerous creature phyla including the Mollusca, Annelida, Arthropoda, Echinodermata, and Chordata.
Eucoelomates (or coelomates) have a genuine coelom that emerges totally inside the mesoderm microbe layer and is lined by an epithelial film. The fluid-filled space between the visceral organs and the body wall is represented by this coelomic cavity.
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Though it was once thought to be under good control, active _____________ returned as a public health threat shortly after the beginning of the aids epidemic.
Though it was once thought to be under good control, active tuberculosis (TB) returned as a public health threat shortly after the beginning of the AIDS epidemic.
Tuberculosis (TB) is a bacterial infection caused by Mycobacterium tuberculosis that primarily affects the lungs. In the early to mid-20th century, TB was a major public health threat in many parts of the world, but advances in medicine, such as the development of antibiotics and improved public health measures, led to a significant decrease in the incidence of TB.
However, in the 1980s, the emergence of the AIDS epidemic led to a resurgence of TB as a public health threat. HIV weakens the immune system, making individuals more susceptible to infections like TB.
Furthermore, people with HIV are more likely to develop active TB, rather than remaining in a latent state, which means that the bacteria are inactive and do not cause symptoms.
The co-infection of TB and HIV posed a significant challenge for public health authorities and health care providers, as treating both infections at the same time can be complicated, and failure to treat one can lead to treatment failure of the other.
Consequently, TB continues to be a major public health issue, particularly in low- and middle-income countries with high rates of HIV infection.
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Ultraviolet light causes pyrimidine dimers to form in DNA. Some individuals are genetically incapable of repairing some dimers at "normal" rates. Such individuals are likely to suffer from:
Individuals who are genetically incapable of repairing pyrimidine dimers at normal rates are likely to suffer from increased risk of skin cancer and other DNA damage-related conditions. The accumulation of unrepaired pyrimidine dimers in the DNA can lead to mutations and genomic instability.
Pyrimidine dimers are formed when neighbouring pyrimidine bases (thymine or cytosine) on the same DNA strand create covalent connections with one another. This can happen as a result of UV light exposure, which causes the two nearby pyrimidine bases to chemically bond together. The most prevalent kind of pyrimidine dimer is a thymine dimer, which is created when two adjacent thymine bases form a covalent bond. This type of dimer alters the structure of the DNA and prevents normal DNA replication and transcription. Pyrimidine dimers have the potential to cause mutations and the formation of malignant cells if they are not corrected. Pyrimidine dimers can be repaired by cells using NER (nucleotide excision repair) and photolyase-mediated repair.
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According to the presentation, what could performing procedures on ill animals cause?
According to the presentation, The risks associated with the procedure increase due to performing procedures on ill animals.
Operational risk, also known as surgical risk, is the cumulative chance of dying, developing a new illness or medical condition, or seeing an existing illness get worse in the early or late postoperative period and being directly related to receiving surgical treatment.
Typically, the patient's general health is used to summarise the core of the surgical risk as a total of negative patient-related characteristics. Risk factors associated with patients can be divided into those that can be changed and those that cannot. This categorization has the most therapeutic relevance since it may optimise preoperative risk overall and enhance outcomes by removing or changing risk factors.
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If an animal cell is transplanted to another portion of the developing embryo and it maintains its initial cell type, it is said to be ________.
If an animal cell is transplanted to another portion of the developing embryo and it maintains its initial cell type, it is said to be determined.
The genesis and development of the human embryo is known as human embryonic development. It is distinguished by early developmental events in the embryo, such as cell division and cellular differentiation. In terms of biology, the growth of the human body involves the passage from a one-celled zygote to an adult human being.
When a sperm cell successfully reaches an egg cell and combines with it, fertilisation takes place (ovum). The germinal stage of development then starts when the genetic material of the sperm and egg combines to produce the single cell zygote. The first eight weeks of human embryonic development are referred to as embryonic development; from the start of the ninth week, the embryo is referred to as a foetus. 23 stages make up the eight weeks.
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Suppose that you maintain a laboratory population of 500 fruit flies. The "wretched" gene
locus has two alleles, R and B, R is dominant to B. When the fruit flies
are fed Special Laboratory Diet A, neither allele has any discernable effect on their fitness,
although homozygous recessive individuals are slightly reddish in color, while all other are yellow in color. For each generation, the population is randomly reduced to a size of 500 individuals. Under these conditions, the population experiences no mutations, no emigrations ,there is no mate choice, it is relatively large, and it experiences none are detectable at "wrenched" genes. In lab population 125 of flies are reddish in color, and other of them are yellow in color.
a)Is the population in Hardy-Weinberg equilibrium?
b) What is the frequency of the R allele in this population?
c) What is the frequency of the B allele in this population?
d) After 5 generations, what will the frequency of the R allele be?
e) After 5 generations, how many individuals will be homozygous recessive at the locus, if the
population remains at 500 individuals?
please mention each part seprately with answer
a) No, the population is not in Hardy-Weinberg equilibrium.
b) The frequency of the R allele is 0.75.
c) The frequency of the B allele is 0.25.
d) After 5 generations, the frequency of the R allele cannot be accurately predicted without information on the selection pressures acting on the population.
e) After 5 generations, the number of individuals who will be homozygous recessive cannot be accurately predicted without information on the selection pressures acting on the population.
a) The population is not in Hardy-Weinberg equilibrium because the observed frequency of the recessive phenotype (0.25) differs from the expected frequency (0.0625) calculated using the Hardy-Weinberg equation.
b) Since R is dominant to B and the population is in Hardy-Weinberg equilibrium, the frequency of the R allele can be calculated as the square root of the frequency of the recessive phenotype (0.25), which is 0.75.
c) Similarly, the frequency of the B allele can be calculated as 1 minus the frequency of the R allele, which is 0.25.
d) Without information on the selection pressures acting on the population, the frequency of the R allele cannot be accurately predicted after 5 generations.
e) Without information on the selection pressures acting on the population, the number of individuals who will be homozygous recessive cannot be accurately predicted after 5 generations.
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4. why can an antibiotic be swallowed or injected, but not a disinfectant?
Answer:
Antibiotics can be swallowed or injected because they only act on the bacteria in the body. Disinfectants cannot be swallowed or injected because they contain harmful chemicals and are only meant for inanimate objects.
I hope this helps!!
transcription in e. coli is initiated when the sigma factor of the rna polymerase holoenzyme binds to the promoter region to form a(n)
Transcription in E. coli is initiated when the sigma factor of the RNA polymerase holoenzyme binds to the promoter region to form a closed complex.
This complex then undergoes a series of conformational changes, leading to the formation of an open complex that allows RNA polymerase to access the DNA template and begin transcription.
The sigma factor plays a crucial role in this process, as it recognizes specific promoter sequences and helps to recruit RNA polymerase to the correct location on the DNA.
Once transcription is initiated, RNA polymerase moves along the template strand, synthesizing a complementary RNA molecule that will ultimately be used to make proteins.
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How has social media shifted the conversation around social problems?
A. It has amplified some individual voices.
B. It is another form of corporate messaging,
C. It does not have the same issues as corporate media.
D. It can provide more accurate content than mass media.
Answer:
Explanation:
D
retroperitoneal organs include most of the duodenum, the ______, the ascending and descending colon of the large intestine, and the ______.
The retroperitoneal organs are those that lie behind the peritoneum, a thin membrane that lines the abdominal cavity. These organs include the majority of the duodenum,
which is the first part of the small intestine, the pancreas, which sits behind the stomach and produces digestive enzymes and hormones, the ascending and descending colon of the large intestine, which are the parts of the colon that run up and down the right and left sides of the abdomen, respectively, and the kidneys, which filter waste products from the blood and produce urine. These organs are situated deep in the abdomen and are important for digestion, waste elimination, and maintaining fluid and electrolyte balance in the body.
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during ivf, which hormone is injected into a woman in order to stimulate multiple follicles to produce multiple eggs, and what then happens to those eggs?
In IVF, a hormone is administered to activate numerous follicles and create multiple eggs: FSH is a follicle-stimulating hormone.
FSH is injected into a woman during IVF treatment to encourage the ovaries to develop numerous follicles carrying eggs. The eggs are then extracted via minor surgery and fertilized in a laboratory with sperm from the woman's donor.
The further process of growing the embryo is taken into the lab premises before the transplantation into the uterus of the mother. Excess embryos can be frozen and stored for future use in specific instances. This procedure is frequently utilized in situations of infertility caused by endometriosis, male factor infertility, ovulation abnormalities, or unexplained infertility.
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which strand would be synthesized from the following portion of a dna molecule?
In order to determine which strand would be synthesized from a portion of a DNA molecule, we need to understand the basic principles of DNA replication. During replication, the double-stranded DNA molecule unwinds and each strand acts as a template for the synthesis of a new complementary strand.
The new strands are synthesized in the 5' to 3' direction, meaning that nucleotides are added to the 3' end of the new strand. Therefore, the strand that would be synthesized from a given portion of a DNA molecule depends on which strand is being used as the template. If the portion of the DNA molecule given is from the 5' to 3' direction on one strand, then the complementary strand being synthesized would be the 3' to 5' direction on the other strand.
In summary, to determine which strand would be synthesized from a portion of a DNA molecule, we need to know which strand is being used as the template and in which direction the synthesis is occurring. The terms "strand", "portion", and "DNA" are all important concepts in understanding this process.
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oxygen levels are lower at higher altitudes. why would you expect to see increased numbers of reticulocytes in the blood at high altitudes?
a blood cell is placed in a 1.5%salt solution. will osmosis, diffusion, or both occur across the blood cell membrane? why
In this case, both osmosis and diffusion will occur across the blood cell membrane in this scenario.
1. Osmosis: Osmosis is the movement of water molecules across a selectively permeable membrane from an area of low solute concentration (high water concentration) to an area of high solute concentration (low water concentration). In this case, the blood cell is placed in a 1.5% salt solution, which likely has a higher salt concentration than the inside of the blood cell. As a result, water will move out of the blood cell and into the surrounding salt solution, causing the blood cell to shrink.
2. Diffusion: Diffusion is the movement of molecules (including ions) from an area of high concentration to an area of low concentration, until equilibrium is reached. In this scenario, the salt ions (sodium and chloride) in the 1.5% salt solution will tend to move across the blood cell membrane to reach equilibrium.
However, the blood cell membrane may be less permeable to these ions than to water, so the rate of diffusion may be slower than the rate of osmosis.
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The mouth and nasal passages lead to a hollow space behind the mouth called the:__________
The mouth and nasal passages lead to a hollow space behind the mouth called the pharynx.
The pharynx is a muscular tube located behind the mouth and nasal passages that connects the nasal cavity and mouth to the esophagus and larynx. It is an important part of both the respiratory and digestive systems.
In the respiratory system, the pharynx helps to conduct air from the nasal cavity and mouth to the larynx, while in the digestive system, it serves as a passageway for food and liquids on their way to the esophagus. The pharynx is also responsible for preventing food and liquids from entering the airway during swallowing through a reflex called the pharyngeal reflex or swallow reflex.
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Categorize muscles according to whether they facilitate inhalation or exhalation during quiet and forced ventilation. Museles that do not assist in ventilation should not be classified. Inhalation Exhalation diaphragm external oblique scalenes internal intercostals external intercostals biceps
During quiet ventilation, the diaphragm and external intercostal muscles facilitate inhalation, while the internal intercostal muscles and external oblique muscles facilitate exhalation. The scalene muscles may assist in inhalation during deep breathing.
Inhalation Muscles:
1. Diaphragm: This is the primary muscle responsible for quiet inhalation. During forced inhalation, it contracts more forcefully to increase lung volume.
2. External Intercostals: These muscles assist in quiet and forced inhalation by elevating the ribs and expanding the chest cavity.
3. Scalenes: These muscles help in forced inhalation by elevating the first two ribs and expanding the chest cavity further.
Exhalation Muscles:
1. Internal Intercostals: These muscles are primarily involved in forced exhalation. They depress the ribs and decrease the volume of the chest cavity.
2. External Oblique: This muscle assists in forced exhalation by compressing the abdomen and pushing the diaphragm upwards, reducing lung volume.
The biceps muscle is not involved in the process of ventilation, so it is not classified in either category.
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can someone help, please
The Major Causes of WWI were an increase in imperialism and the existence of opposing alliances.
What led to imperialism during World War One?Before World War I, a number of European countries held imperial positions. Imperial rivalry and the quest for additional lands and possessions fueled friction between the major European powers and contributed to the start of the conflict.
Which four factors led to alliances in World War One?Militarism, alliances, imperialism, and nationalism were the key causes of the war's beginning. Large armies turned into potential threats to other nations, and those nations began pressuring alliances in an effort to secure territory.
Which of the following causes would BEST complete the box in the diagram * 1 point above?Abdication of the Czar and worker unrest. This incident caused a power vacuum in Russia, which the Lenin-led Bolsheviks were able to take advantage of to seize control of the government and eventually carry out the October Revolution.
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What type of epithelial cells line the pharynx & esophagus? why?
The pharynx and esophagus are lined by stratified squamous epithelial cells, which provide protection against mechanical and chemical damage.
The stratified squamous epithelial cells lining the pharynx and esophagus provide a protective barrier against mechanical and chemical damage. As food boluses move through the pharynx and esophagus, they can create friction and mechanical stress on the epithelial lining. The stratified nature of the epithelial layer allows for more layers of cells to provide a thicker, more durable barrier. Additionally, the squamous shape of the cells allows for increased surface area for protection against chemical damage from acidic or spicy foods.
The stratified squamous epithelial cells are also able to undergo rapid turnover and replacement, ensuring that damaged or stressed cells can be quickly replaced by new, healthy cells. This turnover and replacement process is aided by the presence of stem cells in the basal layer of the epithelial lining, which can differentiate into new epithelial cells as needed. Overall, the stratified squamous epithelial cells lining the pharynx and esophagus provide essential protection against mechanical and chemical damage during the process of swallowing and digestion.
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Because of the lipid content, these pigments can be stained with Sudan black B and carbol fuchsin: A. bilirubins. B. hemoglobins. C. lipofuchsins
Select the correct answer from each drop-down menu.
A researcher conducts an experiment on the secretion of a particular hormone in mice. Scientists inject mice with a substance that stimulates the production of the hormone. The scientists then test the levels of hormones produced by the mice. The tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. This tool makes
measurements, but the measurements aren’t
.
The tool used to measure the hormones makes quantitative measurements, but the measurements aren't reliable.
What is hormones?Hormones are chemical messengers that are produced by the endocrine glands. They are released into the bloodstream and travel to different parts of the body to help regulate many different functions. Hormones control and regulate many of the body’s functions, such as growth, metabolism, sexual development, reproduction, mood, and behavior. They also help maintain homeostasis, or balance, within the body.
Quantitative measurements involve the collection of numerical data, while reliable measurements involve obtaining results that are consistent and accurate. In this case, the tool is consistently detecting the levels of hormones at 10 points lower than the actual hormone levels, which indicates that the measurements may not be reliable.
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A big fish swims upon and swallows a small fish at rest. Right after lunch, the fattened big fish has a change in:
(a) speed.
(b) momentum.
(c) Both.
(d) Neither.
When the big fish swims upon and swallows a small fish at rest, after eating, the fattened big fish would have a change in speed and momentum. So Option (c) - Both speed and momentum.
When the big fish swallows the small fish, the mass of the big fish increases. Since speed is the ratio of distance traveled to time taken, the additional mass will require more force to maintain the same speed. As a result, the speed of the big fish will likely change.
Momentum is defined as the product of an object's mass and its velocity. Since both the mass and the speed of the big fish change after swallowing the small fish, its momentum will also change.
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calculating the equilibrium from savings function using leakages and injection
To calculate the equilibrium using the savings function, you'll need to consider leakages and injections in the economy. Leakages are savings, while injections are investments. In this context, the equilibrium occurs when leakages equal injections, meaning savings (S) equal investments (I).
To find this equilibrium point, you can use the savings function and the investment function, which are often presented as:
S = s(Y - T)
I = I₀
where S is savings, s is the marginal propensity to save, Y is national income, T is taxes, and I₀ is autonomous investments.
To calculate the equilibrium, set S equal to I:
s(Y - T) = I₀
Solve for Y, the national income, which represents the equilibrium point. This will help you understand the relationship between savings, investments, and the overall economic equilibrium.
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The litter resulting from the mating of two short-tailed cats contains three kittens without tails, two with long tails, and six with short tails. What would be the simplest way of explaining the inheritance of tail length in these cats? Show the genotypes.
The simplest way of explaining the inheritance of tail length in these cats is that the short tail (t) allele is recessive, and cats need to inherit two copies of this allele to have a short tail.
What would be the genotypes of the litter?Tail length in cats is determined by a single gene with two possible alleles: T for long tail (dominant) and t for short tail (recessive).
Let's represent the alleles of the parents with the following genotypes:
Parent 1: Tt (heterozygous, short-tailed)
Parent 2: tt (homozygous, short-tailed)
Using a Punnett square, we can determine the possible genotypes and phenotypes of their offspring:
| T | t
--|-----|-----
t | Tt | tt
t | Tt | tt
t | Tt | tt
From this Punnett square, we can see that all of the offspring will inherit one copy of the t allele from each parent, making them all tt (homozygous, short-tailed). This explains why all of the kittens in the litter have short tails.
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How many chromosomes do humans have during the G1 phase?
During the G1 phase, humans have 46 chromosomes.
In the G1 phase of the cell cycle, a human cell has its normal number of chromosomes before undergoing DNA replication in the S phase. In G1, cells accomplish most of their growth; they get bigger in size and make proteins and organelles needed for normal functions of DNA synthesis. Here, proteins and RNAs are synthesized, and, more especially the centromere and the other components of the centrosomes are made.
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