a man has a condition in which his sperm cannot produce the energy to move independently. this suggests the presence of a defect in which part of the sperm?

The contraction of a band of actin filaments around the circumference of the cell causes cytokinesis in animal cells.

Cytokinesis is the process of cell division that involves the division of the cytoplasm and the separation of the daughter cells that occur following mitosis or meiosis. Cytokinesis in animal cells is a bit different from plant cells as it is based on the formation of a contractile ring that encircles the cell and eventually causes it to split into two cells. During the anaphase of mitosis or meiosis, the chromosomes move to opposite poles of the cell due to the pulling action of microtubules that attach to the chromosomes.

Once the chromosomes are fully separated, the cell prepares to divide by undergoing cytokinesis, which involves the formation of a contractile ring consisting of actin filaments and myosin II that form around the cell's midsection. The actin-myosin ring then contracts, causing the cell to pinch inwards and eventually divide into two new cells. In summary, the contraction of a band of actin filaments around the circumference of the cell causes cytokinesis in animal cells.

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The part of the graph shows the highest rate of growth before the ecosystem reaches its carrying capacity for wolves is B to C. This sigmoid  growth curve is for the Geometric Growth phase.

The maximum number of organisms that a system can sustainably support is known as carrying capacity. The ability of an ecosystem to replenish the food, water, environment, or other essentials that populations need to thrive are just a few examples of the many variables that may affect an ecosystem's carrying capacity for a certain species.

The idea of carrying capacity connects how many species an environment can support to its resources. Ecosystems cannot consistently go over their carrying capacity. A species will exhaust its supply of food, water, or other essentials when the population density of that species surpasses the ecosystem's carrying capacity. The population will soon start to decline. A population can only increase so much before it exceeds the environment's carrying capacity. Resources won't be available at that point to support long-term growth of the organisation.

An S-shaped (sigmoidal) curve known as a logistic growth curve can be used to describe functions that increase gently at initially, more quickly in the middle growth phase, and slowly at the end, levelling off at a maximum value over time. The growth rate accelerates as the curve's midpoint is approached; the beginning portion of the curve is exponential. The growth rate starts to slow down at the halfway point (K/2), but it keeps growing until it reaches K, the "carrying capacity" for the environment.

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The correct answer is Venter and Smith. Whole genome shotgun sequencing was developed by Craig Venter and Hamilton Smith in the late 1980s. They used a method that involved breaking the genome into small pieces and then sequencing the fragments. This allowed them to sequence large genomes quickly.

Whole Genome Shotgun Sequencing is a process where DNA is broken down into small fragments and read using sequencing technology. The complete genome is then assembled from the reads. This technique was first described by Venter and Smith in 1995. Whole Genome Shotgun Sequencing (WGSS) is a technique for sequencing a genome without first having to create a physical or genetic map of it.

The shotgun sequencing method has revolutionized the way genomes are sequenced, especially for large, complex organisms. WGSS is a quicker, more efficient way of sequencing than traditional methods like map-based sequencing. It also helps to fill in gaps in genomes that cannot be covered by other sequencing methods.

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The statement "the normal flora of the skin is predominantly gram-negative rods" is false because normal flora of the skin is predominantly gram-positive cocci.

Gram-negative bacteria are a group of bacteria that lack the essential thick layer of peptidoglycan that is present in the cell walls of Gram-positive bacteria. Gram-negative bacteria, which include the majority of clinically significant bacteria, are classified based on their cell wall characteristics, which contain an outer membrane with lipopolysaccharides (LPS) that can generate endotoxin under certain circumstances. Endotoxin is a potent mediator of sepsis in individuals and can also contribute to septic shock.

The normal flora of the skin is predominantly gram-positive cocci such as Staphylococcus and Streptococcus, as well as some gram-positive bacilli like Propionibacterium, and Actinomyces. Therefore, the given statement, "the normal flora of the skin is predominantly gram-negative rods" is false.

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The organ of auditory transduction is called the cochlea. It is a fluid-filled tube located in the inner ear. It works by transforming auditory vibrations into neural activity.

The cochlea is a part of the inner ear that is a fluid-filled tube and has sensory receptors that respond to sound waves. The human cochlea is 3.5 cm long and coiled up like a snail shell.The cochlea has three fluid-filled compartments, including the scala vestibuli, the scala media, and the scala tympani. The cochlea is an organ that detects sound and sends signals to the brain through the auditory nerve. The cochlea's hair cells are responsible for transducing sound waves into neural signals, which are then sent to the brain for processing. The cochlea's hair cells are ciliated and react to different sound frequencies, allowing us to perceive various sounds of different frequencies.

The hair cells are the sensory receptors of the auditory system located in the cochlea. The hair cells in the cochlea convert mechanical sound vibrations into electrical signals that are sent to the brain via the auditory nerve. They are responsible for transducing sound waves into neural signals. They are called hair cells because they have tiny hair-like projections on their surface.The cilia on the hair cells vibrate when sound waves strike them, which then releases a chemical neurotransmitter that excites the auditory nerve, generating electrical signals. The hair cells have a limited ability to regenerate and can be damaged by excessive noise, infections, aging, or certain medications.

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Pyruvate dehydrogenase (PDH), isocitrate dehydrogenase (IDH), and alpha-ketoglutarate dehydrogenase (AKGDH) are all enzymes involved in cellular respiration, specifically in the citric acid cycle.

The activity of PDH will drop if PDH's enzymes E1, E2, and E3 are no longer linked together, which will lead to a decrease in the generation of acetyl-CoA, a substrate for the citric acid cycle.

The dissociation of PDH enzymes does not directly affect isocitrate dehydrogenase (IDH) or alpha-ketoglutarate dehydrogenase (AKGDH), but it may have an indirect impact on these enzymes' activity due to the lower availability of acetyl-CoA generated by PDH.

The citric acid cycle is a metabolic system that is highly interconnected, and any disturbance in one area of the pathway might have an impact on the remainder of the cycle. Therefore, if PDH activity is decreased, the citric acid cycle's overall activity and the amount of citric acid produced may both drop as a result.

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Cyclins are proteins that regulate the progression of the cell cycle by activating cyclin-dependent kinases (CDKs). If the regulators that control cyclin production are no longer produced, it could have significant consequences on cell cycle progression and cell division.

Here are two possible outcomes:

Cells may enter into a permanent state of cell cycle arrest: Without cyclins, CDKs are unable to phosphorylate target proteins that are necessary for progression through the cell cycle. As a result, cells may be unable to complete the cell cycle and may enter into a permanent state of cell cycle arrest known as senescence. This could lead to a decrease in cell proliferation and the development of age-related diseases.

Uncontrolled cell division: In some cases, the loss of cyclin regulators may lead to uncontrolled cell division and the development of cancer. Cyclins play an essential role in regulating cell cycle progression, and their loss could result in cells dividing uncontrollably, leading to the formation of tumors.

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The hypothesis that is best supported by the information in the passage is "exocrine secretions of skeletal muscle act on adipose tissue." The correct option is c.

A hypothesis is a statement about the relationship between variables in a research study. It is a testable prediction for an observed phenomenon or a particular pattern that can be noticed in the natural world. The scientific method is based on hypotheses that can be proven or disproven through experimentation.

The passage is about the relationship between skeletal muscle and adipose tissue. The paragraph discusses how skeletal muscle secretes proteins called myokines when exercised and how these myokines have effects on other tissues, including adipose tissue. The author goes on to explain how the myokines produced by skeletal muscle during exercise can affect adipose tissue. This hypothesis is best supported by the information in the passage.

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The modern task of taxonomists to figure out the evolutionary relationships of species is more difficult than the original task of discovering new species and giving them unique names. This is due to the complex nature of determining evolutionary relationships.

Firstly, discovering new species and giving them unique names is a relatively straightforward process. It involves finding a new organism, examining its characteristics and comparing it to known organisms to determine if it is a new species. Once it has been determined that the organism is a new species, a unique name can be given to it.

On the other hand, figuring out the evolutionary relationships of species is much more complex. It involves analyzing DNA sequences, anatomical features, and other data to determine how different species are related to each other.

Secondly, the modern task of taxonomists requires a deep understanding of evolutionary biology, genetics, and other related fields. Taxonomists need to be able to interpret complex data and analyze it in the context of evolutionary relationships.

Finally, there are many more species left to be discovered now than in the past. Taxonomists must not only discover new species but also understand their relationships to other known species. This makes the task much more daunting and time-consuming than it was in the past.

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The cells that deposit bone matrix are termed Osteoblasts.

Osteoblasts are bone-forming cells that produce the organic components of bone, including collagen and ground substance. They also form a new bone matrix, which is made up of calcium, phosphorus, and other minerals.

Osteoblasts are responsible for the formation of both the hard outer shell of bone and the inner trabecular lattice of bone. Osteoblasts are active during the formation of bone, but after the bone is formed, they become inactive and are replaced by osteocytes.

Osteocytes are mature bone cells that are responsible for maintaining bone strength and integrity. Osteons are cylinders of bone cells, arranged concentrically around a central canal, that serve to increase bone strength and stiffness. Marrow cells are found in the bone marrow and are responsible for the production of new blood cells.

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Neurons communicate information from involuntary movement by way of cranial and peripheral nerves via reflex reactions.

Reflex reactions occur when a stimulus causes an involuntary response from the body, usually a muscle contraction or glandular secretion. The stimulus is detected by sensory neurons which send a message to the central nervous system.

This message is then relayed to motor neurons, which cause an effector organ or muscle to contract or relax in response.
The two basic types of neurons are sensory neurons and motor neurons. Sensory neurons bring information from the sense organs to the brain and spinal cord, while motor neurons carry information from the brain and spinal cord to the muscles and glands.

Neurons communicate information in several ways, but the most important are through the use of electric signals called action potentials and chemical signals called neurotransmitters.

Action potentials are generated by the movement of ions across the cell membrane, while neurotransmitters are released from the presynaptic neuron and bind to receptors on the postsynaptic neuron.

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There are two possible genotypes of one copy of the ear silencing gene and one copy of the ear expression gene and two possible genotypes for two copies of the ear expression gene.

Assuming that the gene for ear silencing is represented by the letter E and that the dominant allele codes for the silencing of ears, and the recessive allele codes for the expression of ears, the genotypes of the parents can be represented as follows:

Using a Punnett square(See Table) to combine the alleles of the parents, we can determine the possible genotypes and phenotypes of their offspring.

So, there are two possible genotypes for their offspring: Ee (one copy of the ear silencing gene and one copy of the ear expression gene) and ee (two copies of the ear expression gene).

In terms of phenotype, both genotypes will express ears since they have at least one copy of the ear expression gene. However, the Ee genotype will carry the ear silencing gene, which means that it can pass it on to its offspring.

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mitochondria are thought to be derived from aerobic bacteria that became part of the eukaryotic cell through endosymbiosis is true.

It is thought that eukaryotic cells' endosymbiotic relationship with aerobic bacteria gave rise to mitochondria. According to the endosymbiotic theory, an ancestral eukaryotic cell once swallowed free-living bacteria and turned them into mitochondria. Since the bacteria could make ATP for the eukaryotic cell to use as energy and the eukaryotic cell could protect the bacteria from harm, this was probably a good arrangement for both parties.

The swallowed bacteria gradually lost most of their original genes and were integrated into the eukaryotic cell, some of which were transferred to the nucleus of the host cell. The resulting structure, the mitochondrion, has a double membrane and is made up of ribosomes and its own DNA.

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Asexual reproduction can be beneficial for a sea anemone when the environment is unpredictable and there is a need for quick adaptation. In this case, asexual reproduction can create a large number of genetically identical individuals in a short amount of time. This can give the species a better chance of survival in a rapidly changing environment.

Sexual reproduction can be advantageous for a sea anemone when there is a need for genetic variation. Sexual reproduction creates offspring with a combination of genetic material from both parents. This increased genetic diversity can help the species adapt to fluctuating environmental conditions. Additionally, it can help the species survive over longer periods of time due to the increased genetic variation.

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The role of hormone-sensitive triacylglycerol lipase is to hydrolyze triacylglycerol stored in adipose cells to release fatty acids. Option B is correct.

Triacylglycerol lipase (TAG lipase) is an enzyme that hydrolyzes triacylglycerols (TAGs) into fatty acids and glycerol. TAG lipase is produced and secreted by the pancreas into the small intestine, where it plays an important role in the digestion of dietary fats.

TAG lipase breaks down TAGs into fatty acids and glycerol, which are then absorbed by the small intestine and transported to other parts of the body for use as an energy source or for storage in the adipose tissue.

This enzyme is activated by hormones such as adrenaline and glucagon, which are released during times of energy demand. Hormone-sensitive triacylglycerol lipase is a key enzyme involved in the breakdown of stored fat into fatty acids, which can then be used by the body as an energy source.

Hence, B. hydrolyze triacylglycerols stored in adipose cells to release fatty acids is the correct option.

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--The given question is incomplete, the complete question is

"The role of hormone-sensitive triacylglycerol lipase is to: a) hydrolyze membrane phospholipids in hormone-producing cells b) hydrolyze triacylglycerols stored in adipose cells to release fatty acids c) hydrolyze dietary lipids in the intestine before they are absorbed d) synthesize triacylglycerols in the liver e) synthesize lipids in adipose cells."--

One copy of a gene differs from another by two nucleotides. The first copy codes for blue eyes; the other codes for brown eyes. We call these different forms of genes: alleles. The correct option is A.

In genetics, the word 'allele' refers to an alternative form of a gene that can arise due to mutations or changes in the nucleotide sequence. Each allele of a gene has a unique DNA sequence, and it can produce different versions of a protein that governs a particular trait or characteristic.

For instance, the gene that regulates eye color has two alleles - one for blue eyes and another for brown eyes. Both these alleles differ by only two nucleotides in their DNA sequence. A nucleotide is a building block of DNA, which comprises a sugar, a phosphate group, and a nitrogenous base.

There are four different nitrogenous bases in DNA - Adenine (A), Guanine (G), Thymine (T), and Cytosine (C). The specific sequence of these nucleotides in a gene determines the protein that it encodes and the trait it imparts.

In the case of the eye color gene, the blue-eye allele has two nucleotides that differ from those of the brown-eye allele, resulting in the production of distinct versions of the protein that determine the color of the iris.

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The percentage of floating leaf disks is a reasonable measure of photosynthetic rate because the leaves float due to the oxygen production during photosynthesis.

During photosynthesis, plants produce oxygen gas as a byproduct when light energy is converted into chemical energy stored in organic compounds. The oxygen gas is released into the surrounding water or air, depending on the plant's environment. When oxygen is produced by photosynthesis in the water surrounding the leaf disks, it causes the disks to become buoyant and float to the surface. Therefore, the percentage of floating leaf disks provides a reasonable measure of photosynthetic rate because it reflects the amount of oxygen being produced by the plant as a result of photosynthesis.

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ANSWER:

0.4375

EXPLANATION:

In Hardy-Weinberg equilibrium, the sum of the frequencies of all alleles in a population must add up to 1.

So, if the frequency of the A allele is 0.75, then the frequency of the a allele (which is the other allele in this population) must be 0.25 (because 0.75 + 0.25 = 1).

And if the frequency of the a allele is 0.60, then the frequency of the A allele must be 0.40 (because 0.60 + 0.40 = 1).

Now, to find the value of pq, we need to multiply the frequency of the A allele (p) by the frequency of the a allele (q), which gives us:

pq = 0.75 x 0.25 = 0.1875

And to find the value of q, we simply subtract the frequency of the A allele from 1, which gives us:

q = 1 - p = 1 - 0.75 = 0.25

So the sum of pq and q will be:

pq + q = 0.1875 + 0.25 = 0.4375

Therefore, the sum of pq and q is 0.4375.

In a population that is in Hardy-Weinberg equilibrium, if the frequency of the "a" allele is 0.75 and the frequency of the "a" allele is 0.60, then the sum of PQ and q will be 1.

The reason is that the sum of the two alleles' frequencies must add up to 1.00, which is the total frequency of all alleles in the population.

The Hardy-Weinberg equilibrium is a genetic concept that describes the pattern of alleles in a stable population. The frequency of alleles (variant forms of genes) in a population is used to evaluate whether a population is in Hardy-Weinberg equilibrium.

In Hardy-Weinberg equilibrium, the frequency of alleles and genotypes in a population do not change over time unless there is a disturbance, such as mutation, gene flow, or selection.

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Mendel continued some of his experiments to the F2 generation to observe whether or not a recessive trait would reappear. This is option (c) hence the correct choice.

Gregor Johann Mendel was a scientist and monk who is regarded as the father of modern genetics. He conducted experiments on pea plants to study heredity, and his discoveries laid the groundwork for modern genetics. Mendel bred two pea plants with different traits to study inheritance, such as flower color, seed texture, and plant height, among others.In the F1 generation, the plants bred from the two pea plants with different traits were all heterozygous. They had one dominant allele and one recessive allele for each trait. Mendel then crossed two F1 plants with different traits to create the F2 generation.In the F2 generation, the recessive trait disappeared in the F1 generation but reappeared in the F2 generation.

Mendel discovered that traits are determined by discrete units of inheritance, which he called "factors." He also discovered that these factors were inherited independently of one another.Mendel continued his experiments to the F2 generation to observe whether or not a recessive trait would reappear. In the F2 generation, some plants exhibited the recessive trait, while others exhibited the dominant trait. Mendel's experiments on pea plants provided the first scientific evidence of the laws of inheritance, which are now known as Mendelian genetics.

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The statement that best distinguishes between mRNA and tRNA is:

mRNA carries protein-building instructions to ribosomes, while tRNA carries amino acids to ribosomes.

mRNA, or messenger RNA, carries genetic information from DNA to ribosomes, where it serves as a template for protein synthesis. It contains the protein-building instructions in the form of a series of codons, which are translated into amino acids by the ribosomes.

tRNA, or transfer RNA, is responsible for bringing the correct amino acids to the ribosome during protein synthesis. It contains an anticodon sequence that matches the codon on the mRNA, allowing it to deliver the corresponding amino acid to the ribosome.

Therefore, while both mRNA and tRNA play important roles in protein synthesis, they have distinct functions in the process, with mRNA carrying the instructions for protein synthesis and tRNA delivering the amino acids.

Answer:

The statement that best distinguishes between the functions of mRNA and tRNA is: mRNA carries protein-building instructions to ribosomes, while tRNA carries amino acids to ribosomes.

mRNA carries the genetic information of a gene to produce a protein, whereas tRNA recognizes the three nucleotide mRNA sequences or codons and transports amino acids to ribosomes based on the mRNA codons.

I hope that helps.

Answer: bc Send a picture of the chart.

Explanation:

I can’t answer without one ;-;

The most likely reason for the failure of a protein that ordinarily goes to the lysosomes to go there is a failure of proper transport via vesicles.

Lysosomes are organelles that are found in animal cells. They are spherical in shape and have a single membrane surrounding them. Their primary role is to digest macromolecules proteins. Lysosomes' role is crucial in maintaining a healthy cell because they are involved in the digestion of a cell's waste products and toxic substances.

They break down complex molecules into simpler ones that can be used by the cell in many ways. For instance, the cell can use them as building blocks for the synthesis of new molecules. Lysosomal enzymes are synthesized in the rough endoplasmic reticulum (ER) and then processed through the Golgi apparatus before reaching lysosomes.

Lysosomes receive enzymes via vesicles that bud from the Golgi apparatus and then fuse with lysosomes. As a result, the lysosome's membrane breaks down, and the enzymes are released inside. Therefore, the most likely reason for the failure of a protein that ordinarily goes to the lysosomes to go there is a failure of proper transport via vesicles.

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Answer: Each chromosome consists of two full-length DNA molecules joined at the centromere. Each of these DNA molecules is a chromatid.

These are the correct options to the question that has been provided:

d. Urinary bladder

d. Nephron

c. Chemodialysis

d. Urethra

b. Excretion

Solutions to whether each sentence is correct or incorrect and solutions to the incorrect one's:

Correct

Correct

Incorrect (the correct spelling is "hemodialysis")

Correct

Correct

Hemodialysis is a medical treatment used to remove waste and excess fluid from the blood when the kidneys are no longer able to function properly. It involves using a machine to filter the blood through a special filter called a dialyzer, which removes waste products and excess fluid. The filtered blood is then returned to the body. Hemodialysis is typically performed several times a week, and each treatment session can last several hours. It is an important treatment option for people with kidney failure or end-stage kidney disease.

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The correct statement is: Vasopressin/ADH secretion induces the kidneys to produce a small volume of concentrated urine and is stimulated when the body fluids are hypertonic.

The pituitary gland releases the antidiuretic hormone vasopressin/ADH in response to variations in blood osmolality. (the concentration of solutes in the blood). Vasopressin is secreted to aid the kidneys in conserving water and producing less concentrated urine when the body's fluids become hypertonic (more concentrated than usual).

Vasopressin, however, plays no direct role in controlling arterial blood pressure. Its principal role in the body is not to restrict blood vessels, which can result in vasoconstriction at high doses and raise blood pressure.

Antidiuretic hormone (ADH), also known as vasopressin, is a hormone that the hypothalamus produces and the posterior pituitary gland releases in reaction to changes in blood volume or blood osmolality (the concentration of solutes in the blood).

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Parrots have unique feet with two toes on the front and rear that enable them to cling to branches.

A black bear's behavioral adaptation is to sleep during the winter.

Behavioral adaptation: Some animals emit warning noises when they are in danger to aid other animals in escaping a predator.

A lion's pointed canines help it tear the meat off the bone, so this is a structural adaptation.

An owl is primarily nocturnal, which means that it hunts and is busy at night.

An organism's physical characteristics that enable it to live in its environment are referred to as structural adaptation. Both the pointed teeth of the lion and the feet of the parrot are instances of structural adaptations.

The lion's pointed teeth are made specifically to aid in the tearing of flesh from the bone, which is necessary for its diet of meat.

Contrarily, behavioral adaptation describes an organism's actions or behaviors that enable it to live in its environment. Hibernation by black bears during the winter is an illustration of behavioral adaptation.

The bear conserves energy and lessens the need for food during a time when food is limited by slowing down its metabolism and sleeping all winter.

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The context of conservation biology genetic diversity mean number and relative frequency of alleles in a population, species, or lineage.

Genetic diversity refers to the total number of genetic traits that make up a species' genetic composition. It varies greatly depending on the number of species present as well as among species, and it can be linked to a species' longevity. It is distinct from genetic variability, which explains the propensity for hereditary traits to vary.

The ability of populations to adapt to changing circumstances is facilitated by genetic variety. More variation increases the likelihood that certain members of a group will have allele variants that are appropriate for the environment. Those people have a higher chance of living long enough to have children who carry that allele. The success of these people will allow the population to continue for longer generations.

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The fact that both elk and fallow deer belong to the Cervidae family and have a more recent common ancestor is the greatest justification for why they are included in the same genus.

Evolutionary relationships are the basis for classification, and similar organisms are placed in the same group. Elk and fallow deer have many traits, which is further supported by the fact that they belong to the same genus.

This suggests that they had a recent common ancestor. The other choices are not directly related to their genus categorization.

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