natural selection refers to the survival of individuals that leads to a more successful population. true or false

The probability of recombination between two loci on opposite ends of chromosome 20 is One chromosome corresponds to a 1% chance of recombination between two loci on a chromosome during meiosis.

Assuming that the two loci in question are located at opposite ends of chromosome 20, they would be separated by a physical distance of approximately 100 cm. This corresponds to 1% chance of recombination between the two loci in each meiotic event taking place in the cell.

If we assume that the two loci are on homologous chromosomes in a diploid individual, then there are two chances of recombination occurring during meiosis, one in each meiotic division.

Thus, the probability of recombination between two loci at opposite ends of chromosome 20 would be approximately 2% for each meiotic event, or 0.02.

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Answer:c

Explanation:

The type of maize whose corn kernels are composed of hard starch with a small central core of soft starch is known as: popcorn Option (d)

Popcorn is a type of corn kernel that expands and puffs up when heated; the same terms also apply to the food item created by the expansion. Popcorn is also known as popped corn, popcorns, or pop-corn.

The tough hull of a popcorn kernel houses the hard, starchy endosperm of the seed, which has between 14 and 20 percent moisture and turns to steam when heated. Pressure from the steam continues to build until the hull ruptures, allowing the kernel to forcefully expand, to 20 to 50 times its original size, and then cool.

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Full Question:  The type of maize whose corn kernels are composed of hard starch with a small central core of soft starch is known as:

a) flint

b) dent

c) sugar

d) popcorn

e) pod

Anticancer drugs, also known as chemotherapeutic agents, can act by a variety of mechanisms to prevent cell division, which is a hallmark of cancer cells.

One mechanism of action is to interfere with the normal functions of the mitotic spindle, which is a protein structure that forms during cell division and separates chromosomes into daughter cells. Mitosis is a process that divides a cell into two genetically identical daughter cells. The mitotic spindle plays a crucial role in this process by separating chromosomes and ensuring that each daughter cell receives a complete and identical set of chromosomes.

Anticancer drugs that prevent the disassembly of the mitotic spindle would directly affect the metaphase phase of mitosis. This is the stage when the chromosomes line up along the equator of the cell, and the spindle fibers attach to the kinetochores of the chromosomes.

Metaphase arrest is a common effect of drugs that target the mitotic spindle, and it can lead to cell death due to a process called a mitotic catastrophe. Mitotic catastrophe occurs when cells attempt to divide despite abnormal mitotic spindles, resulting in the missegregation of chromosomes and aneuploidy. These chromosomal abnormalities can trigger apoptosis or cell death, as they disrupt the normal functioning of the cell.

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Agglutination is described as the process of binding antigens to antibodies. In the given examples agglutination occurs when A antigens binds with anti-A antibodies. So option C is correct.

When an antibody reacts to an antigen, it binds and a complex or an agglutinate is formed and the process is termed as agglutination. Antibodies are specific to antigens, so agglutination reactions occurs when the specific antigen gets binds to the antibody.

Agglutination is most widely used test in determining blood type. A blood group agglutinates anti-A antibody and B agglutinates anti-B antibody. AB type agglutinates both and O group agglutinate none.

So in the give example agglutination happens during binding of anti-A antibodies to A antigen.

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The complete question is

which of the following describes the process of agglutination? group of answer choices

a. binding of a antigens to other a antigens

b. binding of anti-a antibodies to b antigens

c. binding of anti-a antibodies to a antigens

d. binding of anti-a antibodies to any antigens

Water is polar, which allows it to be an effective solvent of other polar molecules that are necessary for life Since it serves as a solvent, liquid water is a need for life on Earth. So the correct option is A.  

It has the power to dissolve molecules and facilitate crucial chemical processes in the cells of animals, plants, and microorganisms. It can dissolve more compounds than most other liquids thanks to its unique chemical and physical characteristics. The fact that water loses density as temperature drops from 4° C to the point at which it freezes makes it one of the peculiar characteristics of water. This enables a variety of aquatic life forms to endure the winter. If ice were more dense than water, it would continue to freeze and sink until the lake was completely frozen.

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Full Question ;

Why do astrobiologists look for water as an indicator that conditions could be suitable to support life? Group of answer choices

A Water is polar, which allows it to be an effective solvent of other polar molecules that are necessary for life

B Water forms covalent bonds with other water molecules, which makes water resistant to heating and cooling and stabilizes temperature for living things

C Water is able to form four covalent bonds and forms the building blocks of organic molecules, which make up living things

D All of these

The endoplasmic reticulum (ER) and smooth endoplasmic reticulum (SER) are important organelles in eukaryotic cells that play a vital role in the synthesis, modification, and transport of a variety of biomolecules, including lipids, steroids, and proteins.

If the ER and SER are removed from a human cell, the cell would not be able to synthesize phospholipids, a major component of cell membranes.

Phospholipids are amphipathic molecules consisting of a hydrophilic head and a hydrophobic tail. They are essential building blocks of cell membranes and play a crucial role in maintaining the integrity of the membrane, regulating cellular transport, and signaling.

The ER and SER are involved in the synthesis of phospholipids by providing the necessary enzymes and cofactors required for the biosynthesis of these molecules. Without the ER and SER, the cell would not be able to synthesize phospholipids, leading to a loss of membrane integrity and potentially causing the cell to lyse.

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The sequences of the normal and mutant proteins are mutations can be caused by the insertion of one or more base pairs.

Mutations that lead to the production of non-functional proteins can be caused by several types of DNA changes, including point mutations (changes to a single base), addition, and deletion.

In this case, the mutant protein has more amino acids than the normal protein, indicating that one or more base pairs have been inserted into the DNA strand. If deletion occurs, one or more amino acids will be missing in the mutant protein compared with the normal protein.

However, in the mutant protein sequence mentioned above, there are additional amino acids (lysine, serine, isoleucine, lysine, tryptophan, arginine) that are not present in the normal protein sequence.

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Light reflects back at a single angle from a smooth surface. Rays of light that are reflected combine to create a smooth surface. This is known as specular reflection. Light behaves like a wave.

The Greek word "optis," which means "appearance," refers to the study of light's behaviour, characteristics, and interactions with matter. Understanding how visible, infrared, and ultraviolet light behaves is part of the study of optics.

Depending on the nature of the item and the light's wavelength, a light wave can be transmitted, mirrored, absorbed, refracted, polarised, diffracted, or scattered when it comes into contact with a surface.

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Electrical stimulation and single-neuron recording studies could provide valuable insights into the neural mechanisms underlying the unique food-washing behavior of Procyon Erickson, shedding light on the evolutionary adaptations of this new mammalian species.

If the new species Procyon Erickson is related to the raccoon but has a unique behavior of washing its food with its hind paws, this species may have evolved a different neural pathway for this behavior. Conducting electrical stimulation and single neuron recording studies in this new species could provide insights into the neural mechanisms underlying this behavior.

During electrical stimulation studies, researchers could stimulate specific areas of the brain or nervous system to observe which areas are involved in food-washing behavior. This could help to identify any novel neural pathways or circuits that are unique to Procyon Erickson.

Single-neuron recording studies could also provide insights into the neural mechanisms of this behavior. Researchers could record the activity of individual neurons in different areas of the brain or nervous system while the animal performs the food-washing behavior. This could help to identify any specific neurons or neural circuits that are involved in this behavior.

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The percentage of cells that were killed by the first chemotherapy dose and the percentage of cells that survived and grew back before the second dose.

The first dose killed [tex](109 - 750,000)/109 = 99.999%[/tex] of the cells.

The second dose was given after the tumor grew to 800,000 cells, so it grew back by [tex](800,000 - 750,000)/750,000 = 0.0667[/tex] or 6.67%.

Therefore, we can expect the next chemotherapy dose to kill approximately 93.33% of the remaining cells.

So, the estimated number of cells remaining after the next dose of chemotherapy would be [tex]800,000 * (1 - 0.9333) = 53,333.[/tex]

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The functions performed by the fibrous skeleton of the heart are:

The fibrous skeleton of the heart is a dense connective tissue structure that forms the framework for the heart. It performs several vital functions, including providing structural support to the heart, serving as a point of attachment for the heart valves, and helping to maintain the shape of the heart during contraction and relaxation. In addition, the fibrous skeleton provides electrical insulation between the atria and ventricles, which is crucial for the coordination of the heartbeat.

Without this insulation, the electrical impulses that regulate the heartbeat would be dispersed, leading to inefficient blood flow and potentially life-threatening arrhythmias. Overall, the fibrous skeleton of the heart is essential for the proper functioning of the heart, ensuring efficient blood circulation and optimal cardiac performance.

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Full Question: "Which are functions performed by the fibrous skeleton of the heart? Select all that apply."The functions performed by the fibrous skeleton of the heart include:

Assuming that the chemical agent only affects the rate of mutation and does not introduce any additional sources of mutations, the probability that the mutation was caused by the chemical agent is 50%.

This is because the chemical agent simply doubles the rate of mutation, meaning that any given mutation has a 50% chance of being caused by the agent and a 50% chance of occurring spontaneously.

However, it is important to note that this probability calculation assumes that there is no interaction between the chemical agent and any other factors that could influence the rate of mutation, such as the organism's environment or genetic makeup. In reality, the probability of the mutation being caused by the chemical agent may be higher or lower depending on these factors.

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Enzymes play a crucial role in cellular processes by catalyzing biochemical reactions.

They work by decreasing the activation energy required for a reaction to proceed, which makes the reaction more likely to occur. Enzymes lower the activation energy by bringing reactants closer together and stabilizing the transition state of the reaction. This allows the reaction to occur more quickly and with greater efficiency.

Enzymes do not provide energy for the reaction, but they do reduce the amount of energy required for the reaction to take place, making it easier for the reactants to reach their transition state. In summary, enzymes increase the rate of cellular processes by lowering the activation energy required for the reaction to occur, and they do so without being consumed or changed by the reaction.

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Large scale mutation can be defined as a mutation in a chromosomal level. The main types of large scale mutations will be Duplication, inversion, and deletion.

There are two types of mutations. Large scale and small scale mutations. Small scale mutation is when changes occurs to only a small number of nucleotides. Large scale mutation happens on a large scale, affecting a large number of nucleotides in the sequence.

Large scale mutation can happen as

1) Duplication - Also known as amplification, where there are multiple copies of a chromosomal region is formed.

2) Inversion - These are rearrangement within the chromosomes, which can be pericentric and paracentric.

3) Deletion - It can happen either when a large part of chromosome is deleted or an allele is deleted. Example :  Down's syndrome.

So the large scale mutations are Duplication, inversion, deletion.

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The complete question is given below

What are types of large-scale mutations on chromosomes? select all that apply.

Duplication, Point-point translocation, Inversion, Deletion, Insertions

A "T" nucleotide was inserted after places 6 and 10 in the original sequence, which is an insertion mutation that can be seen in the mutated DNA sequence.

Comparing the original DNA sequence (ATT CGT ATG AAC) with the mutated DNA sequence (ATT CGT TAT GAATC) shows that a single nucleotide has been changed in the mutated sequence.

Specifically, a "T" nucleotide has been inserted after the sixth base (position 6) and a "T" nucleotide has been inserted after the tenth base (position 10) of the original sequence.

This type of mutation is an insertion, where one or more nucleotides are added to the DNA sequence, causing a shift in the reading frame of the codons. Insertions can result in frameshift mutations, where the codon grouping is altered and can result in the incorrect amino acids being produced during protein synthesis. Frameshift mutations can have significant effects on protein structure and function, potentially leading to genetic disorders or other health issues.

In summary, the mutated DNA sequence shows an insertion mutation, specifically the insertion of a "T" nucleotide after positions 6 and 10 in the original sequence.

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Ignaz Semmelweis was a Hungarian physician who observed a higher incidence of puerperal fever (childbed fever) among women giving birth in hospitals attended by medical students compared to those attended by midwives.

He introduced hand-washing with a solution of chlorinated lime, which resulted in a significant reduction in the incidence of puerperal fever. This work contributed to the idea that infectious diseases are caused by microorganisms that can be transmitted by healthcare workers.

Louis Pasteur showed that microorganisms are responsible for fermentation and spoilage of food and beverages, and that they can be killed by heating (pasteurization). He also demonstrated the germ theory of disease by showing that microorganisms cause anthrax and rabies.

Joseph Lister is considered the father of antiseptic surgery. He introduced the use of carbolic acid (phenol) as a disinfectant during surgery, which significantly reduced the incidence of postoperative infections.

Robert Koch is known for his work on tuberculosis, anthrax, and cholera. He developed Koch's postulates, a set of criteria used to establish a causal relationship between a microbe and a disease. Koch's postulates are still used today to identify the cause of infectious diseases.

Together, the contributions of these individuals helped to establish the germ theory of disease, which states that many diseases are caused by microorganisms such as bacteria, viruses, fungi, and parasites. This theory transformed medicine and led to the development of modern medical practices, including antiseptic surgery and the use of antibiotics.

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The result of a single crossover between two genes during meiosis would be option D: three chromatids will be recombinant, and one will be nonrecombinant.

A single crossing event between homologous non-sister chromatids results in an exchange of DNA between chromosomes when it happens between two genes during meiosis. The synaptonemal complex disintegrates after crossover, and the Cohesin link between homologous pairs is also lost.

Genetic diversity can result from this exchange of genetic material between homologous chromosomes because it can create new allele combinations that neither of the parents possessed. Consequently, three of the chromatids will be recombinant, and one will not.

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Correct question is:

Assume that a single crossover occurs between two genes during meiosis. what would be the consequence of this crossover event?

all of the chromatids will be nonrecombinant.

three chromatids will be non-recombinant, and one will be recombinant.

all of the chromatids will be recombinant.

three chromatids will be recombinant, and one will be nonrecombinant.

two of the four chromatids will be recombinant, and two will be nonrecombinant.

The relationship between mass extinction and adaptive radiation is that adaptive radiation follows mass extinction. It is true that we are in the middle of a mass extinction because the environment has been changing rapidly currently which has affected the lives of various organisms.

Mass extinction is the phenomenon in which the organisms vanish from the earth at a much faster rate than they can be replenished. Extinction of a species can be said when all the organisms of a species have been died from every corner of the earth.

Adaptive radiation is the process in which the existing species on the earth evolved from their ancestral form. This can occurs due to the available niches which provides new environment to the species and an opportunity to evolve.

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The correct laboratory department for processing a surgical specimen that will be stained and evaluated by a pathologist for final diagnosis is the Histology department.

1. The surgical specimen is collected from the patient during surgery or other procedures.
2. The specimen is then properly labeled, ensuring the patient's information is accurate and the type of specimen is indicated.
3. The sample is placed in a fixative solution to preserve its structure and prevent degradation. This is typically formalin, which helps maintain the tissue architecture.
4. The specimen is then transported to the Histology department in the laboratory.
5. Upon arrival, the Histology department logs in the specimen and assigns it a unique tracking number for identification purposes.
6. The tissue is processed by embedding it in paraffin wax. This makes it easier to handle and cut into thin sections.
7. Using a microtome, thin slices of the tissue are cut and placed onto glass slides.
8. The tissue sections on the slides are then stained using various dyes to highlight different structures within the tissue. Hematoxylin and eosin (H&E) stain is a common one used to visualize general tissue structure.
9. The stained slides are examined by a pathologist under a microscope to evaluate the tissue for any abnormalities or diseases.
10. Finally, the pathologist provides a diagnosis based on their evaluation of the stained tissue sections.

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The correct option is C. Crural regions of the body are the tibia and fibula. The tibia and fibula are bones located in the lower leg of the human body.

Crural which refers to the body area including the lower leg. The spinal region extends from the knee joint to the ankle joint and includes the tibia and fibula, as well as other structures such as muscles, nerves, and blood vessels.

The tibia is the larger of the two bones and is the main supporting bone of the lower leg. It connects the knee joint to the ankle joint and is an important bone for mobility and stability.

The fibula is located on the side of the tibia and serves as a site for muscle attachment, but it doesn't support as much weight as the tibia.In a nutshell, the tibia and fibula are bones located in the vertebral region of the body, which is the lower part of the leg.

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Ectotherms don't need as much food as endotherms (warm-blooded animals) of the same size, but they may be more affected by changes in temperature. The correct answer is true.

Because of its high surface area to volume ratio, the small tortoise from the mainland would be more poikilothermic, meaning that its temperature would rise more during the day and fall less at night. This is because the heat would be more easily transferred between the environment and the tortoise's body.

They don't need as much food. Describe the relationship between structure and function for each of the following: sections of the digestive tract that absorb; capillaries; noses of Galápagos finches; a fish's gills

Like the majority of other birds and mammals, humans, polar bears, penguins, and prairie dogs are endotherms. Iguanas and poisonous snakes, as most different reptiles — alongside most fishes, creatures of land and water, and spineless creatures — are ectotherms.

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Pyruvate carboxylase is the enzyme that does not catalyze a regulated reaction. Unlike the other enzymes listed, pyruvate carboxylase does not participate in the regulation of the citric acid cycle or glycolysis.

Pyruvate carboxylase is involved in the anaplerotic pathway, which replenishes the intermediates of the citric acid cycle. This enzyme catalyzes the conversion of pyruvate to oxaloacetate, which can then be converted to citrate and enter the citric acid cycle. The activity of pyruvate carboxylase is influenced by the availability of its substrates, pyruvate and bicarbonate, rather than by allosteric regulation or post-translational modifications.

In summary, while a-ketoglutarate dehydrogenase, succinate dehydrogenase, pyruvate kinase, and isocitrate dehydrogenase are all regulated enzymes involved in the regulation of key metabolic pathways, pyruvate carboxylase does not participate in the regulation of these pathways and does not catalyze a regulated reaction.

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Genetically engineered crops produce greater yields, have a longer shelf life, are resistant to illnesses and pests, and even style better.

A genetically modified organism (GMO) is an organism in which genetic material is altered with the aid of genetic engineering technology. GMO may also sound futuristic; however, one is already surrounded by means of meals derived from GMO products, as they have been present in one's food furnish for decades.

GMO vegetation advocates declare that there is enough proof that GMOs are necessary for promotion sustainable agriculture because it can minimize agriculture's environmental footprint with the aid of decreasing the use of pesticides, saving fossil fuels, reducing CO2 emissions and conserving soil and moisture [21].

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The rate of appearance of glucose in the enzyme-catalyzed reaction is 130 mM per minute.

Maltose is a disaccharide made up of two glucose molecules. The bacterial enzyme breaks down maltose into two glucose monosaccharides through a hydrolysis reaction. In other words, the enzyme uses water to cleave the glycosidic bond in maltose, releasing two glucose units.
Given that the concentration of maltose decreases by 65 mM in 1 minute, we can determine the rate of appearance of glucose. Since one molecule of maltose produces two molecules of glucose, the rate of appearance of glucose would be double the rate of disappearance of maltose. In this case, the rate of maltose disappearance is 65 mM per minute.
To find the rate of appearance of glucose, we can simply multiply the rate of maltose disappearance by 2:
Rate of appearance of glucose = 2 * Rate of disappearance of maltose
Rate of appearance of glucose = 2 * 65 mM/min
Rate of appearance of glucose = 130 mM/min
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The mean values of beak depth in each generation would be; First generation: 2.80 mm, Second generation: 3.00 mm, Third generation: 2.755 mm, Fourth generation: 2.725 mm, and Fifth generation: 2.76 mm.

The response of a trait to selection can be predicted using the breeder's equation; R = h² × S

Where R is the response to selection, h² is the narrow-sense heritability of the trait, and S is the selection differential, which is the difference between the mean of the selected individuals and the mean of entire population.

In this case, we are given the values of S for five successive generations, and we know that the heritability of beak depth is constant at 0.5. The starting mean for beak depth is 2.75 mm. We can use the breeder's equation to calculate the mean value of beak depth in each generation.

For the first generation, the selection differential is 0.1 mm. Plugging in the given values into the breeder's equation, we get;

R = 0.5 × 0.1 = 0.05

The response to selection is 0.05 mm, which is the change in the mean value of beak depth from the starting mean of 2.75 mm. Therefore, the mean value of beak depth in the first generation would be;

2.75 + 0.05 = 2.80 mm

For the second generation, the selection differential is 0.5 mm. Plugging in the given values into the breeder's equation, we get;

R = 0.5 × 0.5 = 0.25

The response to selection is 0.25 mm, so the mean value of beak depth in the second generation would be;

2.75 + 0.25 = 3.00 mm

For the third generation, the selection differential is 0.01 mm. Using the breeder's equation, we get;

R = 0.5 × 0.01 = 0.005

The response to selection is 0.005 mm, so the mean value of beak depth in the third generation would be;

2.75 + 0.005 = 2.755 mm

For the fourth generation, the selection differential is -0.05 mm. Since the mean value of breeding individuals is less than the population mean, this is called disruptive selection. Using the breeder's equation, we get;

R = 0.5 × (-0.05) = -0.025

The response to selection is negative, indicating that the mean value of beak depth in the population will decrease from the starting value. Therefore, the mean value of beak depth in the fourth generation would be;

2.75 - 0.025 = 2.725 mm

For the fifth generation, the selection differential is 0.02 mm. Using the breeder's equation, we get;

R = 0.5 × 0.02 = 0.01

The response to selection is 0.01 mm, so the mean value of beak depth in the fifth generation would be;

2.75 + 0.01 = 2.76 mm

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the fall in shark numbers has the potential to upset the ecosystem's equilibrium and have a domino effect on the populations of other species, such as starfish and limpets.

The populations of limpets and starfish may be indirectly impacted by the decline in shark numbers. Apex predators are at the top of the food chain in the marine ecosystem, and sharks fall into this category.

They are essential in controlling the populations of their prey, which also includes smaller predatory fish that eat limpets and starfish.

A decline in starfish and limpet populations may result from an increase in the populations of these smaller predatory fish as they become a more abundant food supply when there are fewer sharks in the ecosystem.

This is due to the fact that starfish and limpets compete with these smaller predatory fish for resources like food and habitat in addition to being preyed upon by them.

Therefore, the fall in shark numbers has the potential to upset the ecosystem's equilibrium and have a domino effect on the populations of other species, such as starfish and limpets.

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The Golgi apparatus would be the organelle that fulfils a similar role as the employees who package and ship the toy in the hypothetical scenario.

Proteins and lipids are processed and packaged by the Golgi apparatus, also referred to as the Golgi complex or Golgi body, before being transported to their final location. From the endoplasmic reticulum, the Golgi apparatus takes newly synthesised proteins and lipids and modifies, sorts, and packs them into vesicles for transport. Then, either inside the cell or outside of it, these vesicles travel to where they are ultimately going. Similar to how they do in the described scenario, workers pick up the toy from the store or warehouse, wrap it carefully to keep it safe during transport, and then ship it to its final location, Natalie's address, in a package or box. ​

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Answer:Jill’s

Explanation: Jill’s is warmer which makes her have the better insulation

Naturally acquired active immunity occurs when antibodies develop in response to exposure to antigens encountered in the course of daily life.

This type of immunity is a natural response of the immune system to foreign pathogens, such as viruses and bacteria, that enter the body.

When a pathogen enters the body, the immune system produces antibodies that specifically target and neutralize the pathogen. The production of these antibodies is a natural response that occurs as a result of exposure to the pathogen. Once the antibodies have been produced, they remain in the body and provide protection against future infections with the same pathogen.

Examples of naturally acquired active immunity include immunity developed after recovering from a viral or bacterial infection, or through exposure to environmental antigens, such as pollen or dust. This type of immunity is long-lasting and provides a natural defense against a wide range of pathogens encountered in daily life.

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