students in a science class visited four local ecosystems. the students observed the species present in each ecosystem and recorded their observations in the table. ecosystem observations 1: grassy lawn on school property the grass is mowed often and kept short. two sparrows foraged for food in the grass. no other animals were observed. two types of fish were seen in the pond. tadpoles were 2: small pond with cattails growing around the edge swimming in the shallow areas. large wading birds were seen 3: agricultural field feeding on tadpoles and crayfish. wheat plants are the only plants growing in the field. there were many insects. no predators were observed except for a fish, frogs, crayfish, insect larvae, and turtles were seen in the woods. based on these observations, which ecosystem is likely to be the least sustainable? 4: wooded area along a stream. single circling hawk. stream, and wading birds were eating small fish. raccoon tracks were seen in the mud. deer were moving through the trees. many birds were seen feeding in the canopy of the ecosystem 1, because it has the fewest species ecosystem 2, because it includes both aquatic and terrestrial species ecosystem 3, because it has few predators ecosystem 4, because it supports many animals

Chemical energy obtained from the hydrolysis of ATP is used for the movement of muscles. The correct option is A.

Energy is synthesized in the body through cellular respiration, which is through anaerobic respiration and aerobic respiration. These processes yield ATP and other electron carriers such as FADH and NADH₂ which also yield more molecules of ATP.

When a muscle is stimulated to move, it receives a signal through neurotransmitters which results in contraction and relaxation of the muscle. In this process, ATP is hydrolyzed.

Thus, the chemical energy from hydrolysis of ATP is converted into mechanical energy for movement of muscles.

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The environmental factor that would most likely prevent an orange tree from surviving in the desert is the lack of water.

Plants need water to carry out photosynthesis, the process by which they produce energy from sunlight. Without water, they cannot make food, grow, or survive. In the desert, water is scarce, and the hot, dry conditions make it difficult for plants to retain the water they do receive.

Orange trees, which are native to subtropical regions, require a consistent supply of water to grow and produce fruit. In the desert, the extreme temperatures and lack of water would quickly stress and damage the tree, eventually leading to its death.

Therefore, the lack of water is the most critical environmental factor that would prevent an orange tree from surviving in the desert.

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Apoptosis is induced by p53 when any dna damage is detected therefore the correct option is D.

Apoptosis, or programmed cell death, is a normal process of development that is essential for the formation of complex organisms. It occurs when cells receive signals from the environment that they are no longer needed and must die to maintain homeostasis.

The protein p53 plays an important role in this process by sensing severe DNA damage and initiating apoptosis when it cannot be repaired. Additionally, p53 can detect any amount of DNA damage and initiate apoptosis if growth factor levels are low or nonexistent.

Hence the correct option is D.

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Answer:

A. restrictive . . . controlling

Explanation:

Authoritarian parents display high levels of demandingness and low levels of responsiveness, tending to make rules and set high expectations but lack warmth and support. Authoritarian parents tend to “rule with an iron fist.” They are often described as strict, demanding, cold, critical, and punitive.

Answer:

Selective breeding involves choosing parents with particular characteristics to breed together and produce offspring with more desirable characteristics. Humans have selectively bred plants and animals for thousands of years including: crop plants with better yields.Jul 21, 2021

Explanation:

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The four most abundant elements in biomolecules are carbon (C), hydrogen (H), oxygen (O), and nitrogen (N). These elements make up over 99% of atoms found in biomolecules, and they are crucial for the structure and function of various biological compounds.

Carbon is the backbone of organic molecules, as it can form stable covalent bonds with other atoms, including itself. This enables carbon to create long chains and complex structures, which are essential for proteins, lipids, carbohydrates, and nucleic acids.

Hydrogen, the most abundant element in the universe, is vital for the formation of covalent bonds with carbon and other elements. It is also an integral component of water (H2O), which is essential for life and plays a critical role in numerous biological processes.

Oxygen is another key component of biomolecules, particularly in the formation of functional groups. Oxygen's high electronegativity allows it to form strong bonds with carbon and hydrogen, giving rise to polar molecules like carbohydrates and lipids. Additionally, oxygen is the primary component of water, which is fundamental for sustaining life.

Nitrogen, while less abundant than the previous three elements, is still an essential component of biomolecules. It is a crucial constituent of amino acids, which are the building blocks of proteins. Moreover, nitrogen is a key element in nucleic acids (DNA and RNA), which store and transmit genetic information in living organisms.

In summary, carbon, hydrogen, oxygen, and nitrogen are the four most abundant elements in biomolecules, playing critical roles in the structure, function, and stability of various biological compounds that are essential for life.

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The ability of crucian carp to survive in warmer water can be advantageous in certain environments. Warmer water temperatures can provide crucian carp with an increased metabolism rate, allowing them to grow faster and more efficiently.

This increased growth rate can provide food for other species in the environment. Additionally, the higher temperatures can provide more favorable living conditions for the carp, allowing them to better survive and reproduce. Warmer water can also provide more oxygen, allowing them to breathe easier and survive in greater numbers.

The ability of crucian carp to survive in warmer water can also provide a greater variety of food sources, allowing them to take advantage of a wider range of nutrition. These wider food sources can also provide more stability to the environment and help maintain a healthy balance of species.

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Sure, I can help you with that! Here are the steps to calculate the allelic and genotypic frequencies for the population of rabbits:

First, let's define some terms:

Allele: a variant form of a gene that occurs at the same position on a chromosome.

Genotype: the combination of alleles at a particular gene locus.

Frequency: the proportion of individuals in a population that have a certain genotype or allele.

Now, let's use the information provided in the question to calculate the allelic and genotypic frequencies:

The allelic frequency (p) of the dominant black allele is 0.22 / (0.22 + 0.78) = 0.22 / 0.90 = 0.242 (rounded to four decimal places).

The allelic frequency (q) of the recessive white allele is 0.78 / (0.22 + 0.78) = 0.78 / 0.90 = 0.861 (rounded to four decimal places).

The frequency of the black/black (BB) genotype is 0.22/0.78 = 0.289 (rounded to four decimal places).

The frequency of the white/white (ww) genotype is 0.78/0.78 = 1.000 (rounded to four decimal places).

To calculate the genotypic frequencies, we need to combine the alleles for each genotype:

The genotype BB has one black allele and one black allele, so its genotypic frequency is 1 x 1 = 1.

The genotype WW has two white alleles, so its genotypic frequency is 2 x 2 = 4.

Now we can calculate the overall frequency of each genotype in the population:

The frequency of the BB genotype is 1 / (0.22 + 0.78) = 0.454 (rounded to four decimal places).

The frequency of the WW genotype is 4 / (0.22 + 0.78) = 0.546 (rounded to four decimal places).

So, the allelic frequency of the dominant black allele is 0.242, and the allelic frequency of the recessive white allele is 0.758. The genotypic frequency of the BB genotype is 1, and the genotypic frequency of the WW genotype is 4.  

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Answer:

Pollution can be controlled by reducing the pollution at the power plant.

Inside the mitochondria, electrons are passed down a transport chain. This process is known as the electron transport chain and is a critical step in the production of ATP, the energy currency of the cell.

The electron transport chain is located in the inner mitochondrial membrane and consists of a series of protein complexes and coenzymes that pass electrons from one molecule to the next. As the electrons are passed down the chain, energy is released and used to pump protons across the inner mitochondrial membrane, creating a proton gradient.

This proton gradient is then used by the ATP synthase enzyme to produce ATP through a process called oxidative phosphorylation. Overall, the electron transport chain is essential for the efficient production of ATP in the mitochondria, which powers many cellular processes.

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The process by which one species gradually transforms itself into a new species over time is called speciation. Speciation is a fundamental aspect of evolution, and it involves the splitting of a single lineage into two or more distinct species.

This process occurs as a result of genetic changes within populations, leading to the development of unique characteristics that distinguish them from their ancestral species.

There are several mechanisms that drive speciation, including geographical isolation, ecological differentiation, and sexual selection. Geographical isolation happens when populations become physically separated due to barriers such as mountains, rivers, or human-made structures. Over time, these isolated populations experience different environmental pressures and accumulate genetic differences, eventually leading to the formation of new species.

Ecological differentiation is another mechanism that can lead to speciation. It occurs when populations adapt to distinct ecological niches within their environment, resulting in the development of unique traits that enable them to exploit specific resources or habitats. As these populations continue to evolve, they become more specialized, reducing the likelihood of interbreeding and promoting the formation of new species.

Sexual selection is also a crucial factor in the speciation process. It involves the preferential mating of individuals based on specific traits, such as coloration or ornamentation. Over generations, these preferred traits become more pronounced within the population, and eventually, individuals with these traits may no longer be able to mate successfully with those from other populations, leading to reproductive isolation and the emergence of new species.

In summary, speciation is the process by which one species transforms into a new species over time through genetic changes and various evolutionary mechanisms, including geographical isolation, ecological differentiation, and sexual selection.

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To solve this problem, we need to use the principles of Mendelian genetics and Punnett squares. The answer is G) 6.

First, we need to determine the possible gametes (sperm and egg cells) that each parent can produce based on their genotype:

Parent 1: TtBb
Possible gametes: TB, Tb, tB, tb

Parent 2: TtBb
Possible gametes: TB, Tb, tB, tb

To determine the possible genotypes of the offspring, we can use a Punnett square:

|   | TB  | Tb  | tB  | tb  |
|---|---|---|---|---|
| TB | TTBB | TTBb | TtBB | TtBb |
| Tb | TTBb | TTbb | TtBb | Ttbb |
| tB | TtBB | TtBb | ttBB | ttBb |
| tb | TtBb | ttbb | ttBb | ttbb |

From this Punnett square, we can see that there are 9 possible genotypes:

- TTBB, TTBb, TtBB, TtBb (tall with brown eyes)
- Ttbb, ttBb, ttbb (short with green eyes)
- TtBB, TtBb (tall with green eyes)

To determine how many offspring will likely be short with green eyes, we need to look at the specific combination of alleles that result in this phenotype: ttbb or ttBb.

From the Punnett square, we can see that there are 4 offspring with the ttbb genotype (2 from the Ttbb box and 2 from the ttbb box). There are also 2 offspring with the ttBb genotype (from the ttBb box). Therefore, a total of 6 offspring (4 ttbb and 2 ttBb) are likely to be short with green eyes.

The answer is G) 6.

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The labeled structure in which the rate of nutrient absorption is the highest is: structure 5. The correct option is (5).

Structure 5 is the small intestine, which is where the majority of nutrient absorption occurs in the digestive system.

The small intestine is lined with tiny, finger-like projections called villi, which increase the surface area available for absorption. The villi contain even smaller projections called microvilli, which further increase the surface area.

The walls of the small intestine are also covered in tiny blood vessels called capillaries, which carry nutrients away from the small intestine and to the rest of the body.

Structure 4 is the stomach, which primarily breaks down food with stomach acid and muscular contractions but does not absorb many nutrients.

Structure 1 is the mouth, which begins the process of mechanical and chemical digestion but does not absorb any nutrients.

Structure 8 is the large intestine, which primarily absorbs water and electrolytes but does not absorb many nutrients.

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“The l form of pyruvate kinase is more likely to become phosphorylated in the presence of high levels of glucagon” is true, because the l form is more likely to become phosphorylated in the presence of high level of glucagon, option (B) is correct.

Glucagon signals the liver to release glucose into the bloodstream, and phosphorylation of pyruvate kinase in the liver helps to prevent glycolysis and instead promote gluconeogenesis, which is the production of glucose from non-carbohydrate sources.

On the other hand, the m form of pyruvate kinase is more likely to become phosphorylated when glucagon levels are high, which is consistent with the role of glucagon in promoting glycogen breakdown in muscles to release glucose for energy. Option (B) is correct.

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The complete question is:

Pyruvate kinase is a tetrameric enzyme that can exist as an l (found mostly in liver) or m (found mostly in muscles) form. which of the following statements comparing the l and m forms of pyruvate kinase is true? 

A. the m form is more likely to become phosphorylated in the presence of high level of insulin. 

B. the l form is more likely to become phosphorylated in the presence of high level of glucagon. 

C. the l form is more likely to become phosphorylated in the presence of high level of insulin. 

D. the l form is more likely to become phosphorylated under high blood sugar conditions.

E. the m form is more phosphorylated when glucagon levels is high.

An ecosystem and a community are closely related terms. An ecosystem is a collection of living and non-living components that interact with each other.

It includes things like plants, animals, sunlight, soil, water, and climate. A community is a group of living organisms that interact with each other, and their environment. Communities can be made up of different species, such as plants, animals, and fungi.

A key difference between an ecosystem and a community is that an ecosystem is a self-sustaining system, while a community is a group of organisms that live together and interact with each other.

In an ecosystem, the living and non-living components interact with each other in a balanced way. A community, on the other hand, is a group of living organisms that interact with each other and their environment.

In summary, an ecosystem is a self-sustaining system that includes living and non-living components, while a community is a group of living organisms that interact with each other and their environment. Both ecosystems and communities are vital components of the environment, and they play an important role in maintaining a healthy planet.

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Answer:

It gives the body its shape, allows movement, makes blood cells, provides protection for organs and stores minerals.

Hope this helps :)

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Raft spiders, also known as fishing spiders, are fascinating creatures that inhabit wetland habitats throughout the world. The correct option is A. Raft spider sight weight and large surface area allow it to walk on water.

C: Raft spiders sprint along submerged plants to catch underwater prey.

D. Raft spider's legs have a waxy surface that repels water

These spiders are unique in that they have evolved to sprint along submerged plants in order to catch their underwater prey. This incredible ability allows them to move quickly and efficiently across the water's surface, making them one of the most successful predators in their environment.

Raft spiders are well adapted to life in wetlands and have a number of unique adaptations that allow them to survive in this challenging environment. They have large, flat legs that enable them to move quickly across the water's surface without sinking. They also have specialized hairs on their legs that allow them to detect the slightest movements in the water, helping them to locate prey.

One of the most interesting things about raft spiders is their hunting strategy. These spiders use a combination of speed and stealth to catch their prey. They sprint along the surface of the water, using their specialized hairs to detect the movements of potential prey. Once they have located their target, they pounce on it with lightning speed, using their powerful jaws to immobilize it.

Overall, raft spiders are fascinating creatures that have evolved unique adaptations to help them survive in their watery world. Their ability to sprint along submerged plants and catch underwater prey is truly remarkable and makes them one of the most impressive predators in the animal kingdom.

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The carbon dioxide sequestration technology, also known as carbon capture and storage (CCS), would be most useful in areas where large amounts of carbon emissions are being produced but cannot be eliminated entirely, such as industrial facilities and power plants. The correct option is b. at a factory that burns fossil fuels.

The CCS could also be implemented in regions with high levels of natural carbon emissions, such as geothermal power plants or areas with active volcanoes. Additionally, CCS could be used in the transportation sector, where emissions are difficult to eliminate completely.

In terms of geographical locations, CCS could be particularly beneficial in regions with a high concentration of industrial activity and carbon emissions, such as heavily populated areas and urban centers. Additionally, regions with large reserves of oil and gas that can be extracted through enhanced oil recovery (EOR) could benefit from CCS technology. These regions could use the captured carbon to enhance oil and gas production while simultaneously reducing carbon emissions.

Overall, carbon dioxide sequestration technology can be useful in any location where reducing carbon emissions is a priority, but it is especially useful in areas with high levels of industrial activity, transportation emissions, and natural carbon emissions.

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A square is not a tool used to calculate food rations. A square is a geometrical shape that has four equal sides and four right angles. However, there are various tools and methods used to calculate food rations, such as nutritional charts, portion control tools, and measuring cups and spoons. These tools are helpful in determining the appropriate amounts of food for individuals or groups based on their dietary needs and goals.

How do we use food rations?

Tribal hunters or gathers could have possibly used these food rations should they become injured or stranded as a means of survival. If the player finds food ration that has been hung up high, they can knock it down by pressing G to throw a stone. Throwing held weapons or tools is also just as effective.

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Kepler's mathematical abilities and his commitment to empirical observation helped him construct the scientific explanation of the solar system.

Kepler's three laws of planetary motion laid the foundation for modern astronomy and revolutionized the scientific understanding of the solar system. Kepler's mathematical abilities and his meticulous observations of planetary motion were the key to his discoveries.

Kepler was skilled in mathematics and geometry, and he used these skills to create models that could explain the observed motions of the planets.

He also recognized the importance of empirical evidence, and he spent years collecting and analyzing data on the positions and movements of the planets.

Kepler's commitment to empirical observation and his mathematical abilities allowed him to construct a scientific explanation of the solar system that was based on evidence and rigorous mathematical reasoning.

His work laid the groundwork for later discoveries in astronomy and helped to establish the scientific method as a powerful tool for understanding the natural world.

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The pattern of fragments would likely be different between two people.

While restriction enzymes cut DNA at specific sequences, the exact location of these sequences can vary between individuals due to genetic variation.

Therefore, the number and size of resulting fragments would differ between individuals.

Additionally, DNA can undergo mutations that can affect the restriction enzyme recognition site, leading to a different pattern of fragments.

Thus, while the restriction enzyme used is the same, the genetic variation between individuals can result in a unique pattern of DNA fragments on the gel.

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The closest allele frequency in the founding population is E) 0.1 a, 0.9 A.

In the year 2500, five male and five female space colonists settle on an uninhabited Earthlike planet in the Andromeda galaxy. The ten colonists all have free earlobes, and two are heterozygous for that trait. The allele for free earlobes is dominant (A) to the allele for attached earlobes (a). To determine the allele frequency in the founding population, we first need to find the total number of A and a alleles.

Since free earlobes are dominant and two individuals are heterozygous (Aa), the remaining eight must be homozygous dominant (AA) to express the free earlobe trait. Thus, there are 18 A alleles (8 AA individuals × 2 A alleles per individual + 2 Aa individuals × 1 A allele per individual) and 2 a alleles (2 Aa individuals × 1 a allele per individual) in the founding population.

Next, we calculate the allele frequency by dividing the number of each allele by the total number of alleles (20 in this case, as there are 10 individuals × 2 alleles per individual). For A alleles, the frequency is 18/20, which is equal to 0.9. For a alleles, the frequency is 2/20, which is equal to 0.1.

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The rotation of the earth and uneven heating of its surface are two major factors that contribute to the patterns of oceanic circulation.

Due to the earth's rotation, the Coriolis effect causes water to be deflected to the right in the northern hemisphere and to the left in the southern hemisphere. This results in the formation of circular oceanic gyres, which are large-scale rotating systems of ocean currents.

The uneven heating of the earth's surface also plays a significant role in oceanic circulation. The equator receives more solar radiation than the poles, which leads to differences in water temperature and density.

Warm water near the equator rises and moves towards the poles, while cooler water near the poles sinks and moves towards the equator. This process, known as thermohaline circulation, drives the global ocean conveyor belt and helps to distribute heat around the earth.

Together, these two processes create complex patterns of oceanic circulation that can impact climate and weather patterns around the world.

For example, warm water from the Gulf Stream helps to keep northern Europe relatively mild, while the upwelling of cold water off the coast of Peru supports one of the world's most productive fishing regions.

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The solution of sugarcane was boiled with HCl to hydrolyze any sucrose present into glucose and fructose before testing for the presence of reducing sugars with Benedict's reagent.

Sucrose is a non-reducing sugar, which means it cannot directly reduce copper ions in Benedict's solution to form a colored precipitate.

However, upon hydrolysis with HCl, sucrose is broken down into its constituent monosaccharides, glucose and fructose, both of which are reducing sugars that can react with Benedict's reagent.

The hydrolysis with HCl ensures that all the sugar in the solution is in a form that can be detected with the Benedict's test.

Benedict's reagent is a solution of copper sulfate, sodium citrate, and sodium carbonate that can detect the presence of reducing sugars, such as glucose and fructose.

When heated in the presence of reducing sugars, the blue copper ions in the reagent are reduced to form a colored precipitate of copper(I) oxide.

The orange precipitate formed in this experiment indicates that there were reducing sugars present in the Na2CO3 solution, likely due to the hydrolysis of sucrose with HCl.

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To explain how a pigeon gets a crest, the terms "crest," alleles, and protein work together in the following way:

1. The "crest" refers to the distinctive tuft of feathers on the head of certain pigeon breeds.
2. "Alleles" are alternative forms of a gene that determine specific traits, such as the presence or absence of a crest.
3. A specific allele for the crest trait is responsible for encoding the instructions to produce a particular "protein" that influences the development of a crest in pigeons.

The crest of a pigeon is determined by its genetic makeup, specifically by the alleles that control the expression of certain proteins. Alleles are different forms of a gene that can code for different variations of a trait. In the case of pigeon crests, there are different alleles that can produce different types of crests.

The genetic information for the crest is stored in the pigeon's DNA, which is made up of four nucleotides: adenine (A), thymine (T), cytosine (C), and guanine (G). The sequence of nucleotides determines the sequence of amino acids that make up the proteins that control the crest. This is known as the genetic code, which uses a triplet code, with each triplet (or codon) of nucleotides coding for a specific amino acid.

These proteins are synthesized by the pigeon's cells based on the genetic information in its DNA. The process of protein synthesis involves two main steps: transcription and translation. During transcription, an RNA molecule is synthesized based on the DNA sequence of the gene that codes for the protein. The RNA molecule, which is single-stranded and contains uracil (U) instead of thymine (T), carries the genetic information from the nucleus to the cytoplasm.

During translation, the RNA molecule is used as a template to synthesize a chain of amino acids, which will fold into a specific protein. This process occurs at the ribosome, a molecular machine that reads the codons of the RNA molecule and brings in the corresponding amino acids. The sequence of amino acids in the protein determines its structure and function, including the physical characteristics of the crest.

Depending on the alleles that a pigeon inherits, different proteins will be produced that result in different types of crests. For example, one allele might produce a protein that causes the growth of feathers in a certain pattern, resulting in a crest that is tall and narrow. Another allele might produce a protein that causes feathers to grow in a different pattern, resulting in a crest that is wider and more rounded.

So, the alleles determine the type of protein that is produced, and the protein determines the physical characteristics of the crest. All of these components work together to give a pigeon its unique crest, with the genetic information stored in its DNA, transcribed into RNA, translated into protein, and resulting in a specific physical trait.

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The probability that the child will have freckles is 75%.

In this scenario, both parents are heterozygous for the freckles gene, meaning they each carry one dominant allele for freckles (F) and one recessive allele for no freckles (f).

The Punnett square for this cross would be:

                 F                        f

F               FF                      Ff

f                 Ff                       ff

As we can see, there are three possible genotypes for the offspring: FF, Ff, and ff. Out of these, only FF and Ff would have the dominant F allele and therefore have freckles.

The probability of each genotype is 25% (1/4), so the combined probability of the offspring having freckles (either FF or Ff) is 25% + 50% = 75%. Therefore, the answer is 75%.    

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When DNA is replicated, the original strand is split into two new strands of DNA. These newly formed strands are complementary to each other, meaning that one strand contains the exact opposite sequence of the other.

This is due to the fact that the base pairs of DNA, A-T and C-G, are always linked together in the same way. As a result, the two new strands are mirror images of the original strand, or in other words, they are exact replicas of it.

Furthermore, these two strands will act as templates for the formation of two more strands, which are also exact replicas of the original strand. This process will continue until the original strand is completely replicated.

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To differentiate the chimpanzee school from the human school, I used three main features. First, I compared the student body size. The chimpanzee school had a much smaller population than the human school, which made it easy to distinguish.

Secondly, I looked at the curriculum. The chimpanzee school had a much more limited selection of classes than the human school, so that was another distinguishing feature.

Finally, I looked at the physical environment. The chimpanzee school was much more primitive, with a much simpler infrastructure, compared to the human school.

In conclusion, by comparing the size, curriculum, and physical environment, I was able to easily determine which school was the chimpanzee school and which was the human school.

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