explain how gaba a subunit composition influences affinity and binding specificity for various agonists

Answer:

A

R

A

R

A

R

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Answer:A lymphocyte (B or T cell) that retains a “memory” of a specific pathogen after an infection is over and thus provides immunity to the pathogen.

Explanation:

The correct answer is option d) nasopharynx.

The middle ear has four components: the tympanic membrane, the eustachian tube, the malleus, the incus, the stapes, and the tympanic cavity. Among these, the nasopharynx is not a component of the middle ear.

The nasopharynx is located in the upper part of the throat, behind the nose, and above the oropharynx and laryngopharynx. It connects the nose and the mouth to the rest of the throat and the lungs.

The eustachian tube is a narrow tube that connects the middle ear to the nasopharynx.

The malleus, incus, and stapes are three small bones that are found in the middle ear.

The tympanic membrane, also known as the eardrum, is a thin, semi-transparent layer of tissue that separates the outer ear from the middle ear. The tympanic cavity is a small, air-filled space that is located within the middle ear, behind the eardrum. This cavity is connected to the nasal cavity by the eustachian tube.

The middle ear is responsible for transmitting sound from the outer ear to the inner ear. The malleus, incus, and stapes are involved in this process, while the eustachian tube is responsible for regulating the pressure within the middle ear.

The nasopharynx contains the auditory tube, which is responsible for draining secretions away from the middle ear. However, it is not considered a component of the middle ear.

In conclusion, the nasopharynx is not a component of the middle ear.

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This process is called synaptic plasticity. Synaptic plasticity is the ability of two neurons to form a stronger connection when they become active at the same time. This process is important for learning, memory formation, and other cognitive processes.

If two brain cells become more active at the same time, the connections between them grow stronger. This process is called Hebbian Learning.The learning process that occurs when the firing of one neuron strengthens the synapse that leads to a neighboring neuron is known as Hebbian learning. It is named after Canadian psychologist Donald Hebb, who first proposed the concept in 1949.

This theory is based on the idea that the two neurons that fire together become connected, and the synaptic link between them grows stronger when they do. Hebbian learning has been related to a variety of learning processes in the brain, including the development of perceptual maps in the visual cortex, the refinement of motor control, and the learning of higher-order cognitive abilities. It is thought to underlie most types of memory and plays a critical role in neural development, memory formation, and learning.

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LDL cholesterol is responsible for transporting cholesterol from body cells to the liver. Cholesterol is an essential component of the human body's cell membrane, aiding in the formation of steroid hormones, bile acids, and vitamin D. However, high levels of cholesterol in the bloodstream can lead to cardiovascular disease.

A variety of lipoproteins transport cholesterol in the bloodstream, including very-low-density lipoprotein (VLDL), intermediate-density lipoprotein (IDL), low-density lipoprotein (LDL), and high-density lipoprotein (HDL). When the liver creates VLDL, it is then converted into IDL, which is subsequently converted into LDL. LDL cholesterol is responsible for transporting cholesterol from body cells to the liver. The liver is responsible for absorbing LDL cholesterol and breaking it down, converting it into bile salts, or excreting it. When there is an excess of LDL cholesterol in the bloodstream, it can deposit on the walls of the arteries, causing them to narrow and harden, resulting in atherosclerosis. LDL cholesterol is often referred to as "bad" cholesterol since elevated levels are linked to an increased risk of cardiovascular disease. Maintaining a healthy diet, exercising, and not smoking are some of the ways to reduce LDL cholesterol levels. In summary, LDL cholesterol is responsible for transporting cholesterol from body cells to the liver. When there is an excess of LDL cholesterol in the bloodstream, it can lead to atherosclerosis, which raises the risk of cardiovascular disease.

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Answer:

Yes, human eggs (also known as ova or female gametes) only have an X chromosome. This is because human females have two X chromosomes in their cells, and during meiosis, when the egg is formed, one of the X chromosomes pairs up and separates, leaving only one X chromosome in the mature egg cell. In contrast, human sperm can have either an X or a Y chromosome, as males have one X and one Y chromosome in their cells.

Heat or a surface-active agent must be used with the application of the primary stain during acid-fast staining because the cell wall of acid-fast bacteria is impermeable to stains.

This means that the primary stain is unable to penetrate the cell wall of these bacteria without the aid of heat or a surface-active agent such as carbolfuchsin.

In other words, heat or a surface-active agent is used to help the primary stain penetrate the cell wall of acid-fast bacteria, allowing it to bind to the lipids in their cell walls. This makes the bacteria visible under a microscope and helps to differentiate them from non-acid-fast bacteria, which do not have such impermeable cell walls.

The process of acid-fast staining involves the use of heat or a surface-active agent with the primary stain to help it penetrate the cell wall of acid-fast bacteria. This is necessary because the cell wall of these bacteria is impermeable to stains, making it difficult to visualize them under a microscope. By using heat or a surface-active agent, the primary stain is able to bind to the lipids in the cell wall of these bacteria, making them visible under a microscope. This helps to differentiate them from non-acid-fast bacteria, which do not have such impermeable cell walls.

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Answer:

The fact that DNA replication and gene expression in archaea more closely resemble eukaryotic cells than the same processes in bacteria, despite both archaea and bacteria being prokaryotic, suggests that there are significant differences between the two domains of prokaryotes in terms of their cellular machinery and molecular processes.

Although archaea and bacteria are both classified as prokaryotes because they lack a nucleus and other membrane-bound organelles, they differ in several key ways. For example, archaea have a distinct cell membrane composition that is more similar to that of eukaryotes than to bacteria. Additionally, archaea have a more complex transcriptional machinery, with RNA polymerases that more closely resemble those found in eukaryotes.

These differences in cellular machinery likely arose through evolutionary divergence, with archaea and eukaryotes sharing a common ancestor that was distinct from the ancestor of bacteria. Therefore, the similarities between archaea and eukaryotes in terms of DNA replication and gene expression suggest that these processes were already complex and well-developed in the common ancestor of archaea and eukaryotes, and were later lost or simplified in bacteria.

Answer:

1. a sequence of DNA responsible for coding a protein = gene

2. the complete range of alleles an organism carries for a specific trait = genotype

3. an allele that determines the outward trait of a heterozygous organism = dominant

4. the observable characteristics of an organism = phenotype

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Answer:

a sequence of DNA responsible for coding a protein = gene

The complex range of alleles an organism carries for... = genotype

an allele that determines... = dominant gene

the observable characteristics= phenotype

First one

genetic, the sequence of nucleotides in deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) that determines the amino acid sequence of proteins

__________________________________________________________

Second one

The combination of alleles that an organism carries constitutes its genotype. If the paired alleles are the same, the organism's genotype is said to be homozygous for that trait; if they are different, the organism's genotype is heterozygous

__________________________________________________________

Thierd one

an allele that determines... = dominant gene

__________________________________________________________

Fourth one

The term "phenotype" refers to the observable physical properties of an organism; these include the organism's appearance, development, and behavior. An organism's phenotype is determined by its genotype, which is the set of genes the organism carries, as well as by environmental influences upon these genes

The correct answer is: During crossing over, when the invading strand uses the invaded DNA as a template, this automatically results in an extra copy of the invaded sequence at the expense of the invading sequence, thus explaining the departure from the expected 1:1 ratio of crossing over.

Explanation:

DNA is replicated through the process of crossing over, which involves the exchange of genetic material between two homologous chromosomes. During the process, one of the homologous chromosomes acts as the invading sequence, while the other acts as the invaded DNA. When the invading strand uses the invaded DNA as a template, it results in an extra copy of the invaded sequence at the expense of the invading sequence, thus explaining the departure from the expected 1:1 ratio of crossing over.
What is crossing over?

Crossing over is a process during meiosis where the chromosome arms of maternal and paternal homologous chromosomes swap DNA sections (recombination) to produce new allelic combinations of traits. The crossing-over process starts with the breakage of two homologous chromosomes, the migration of the broken ends toward each other, and the formation of crosslinks by the formation of single crossovers.

These crosslinks are eventually converted to chiasmata that keep the chromosomal arms connected until metaphase I. During this process, one chromosome might lose genetic material while the other might acquire genetic material. This event results in unique combinations of genes that might not be present in either parent. The frequency of crossovers is affected by the distance between the gene and the centromere. Chromosomes that are nearer to the centromere are less likely to cross over than those that are further away. Explaining the departure from the expected Mendelian ratio.

The ratio of offspring created by a cross that exhibits the dominant and recessive traits that Mendel observed is referred to as the Mendelian ratio. Crossing over might result in new allelic combinations of genes that deviate from the Mendelian ratios. This is because the transmission of genes is no longer controlled by a single gene pair on a chromosome. Chromosome segregation is disturbed in one way or another by crossovers.

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In the example of interdomain communication between Rhizobium species and leguminous plants, the advantage of the successful interaction for the plant is that it enables the plant to fix atmospheric nitrogen into ammonia.

The Rhizobium species have a symbiotic relationship with the leguminous plant roots, which allows the nitrogen-fixing bacteria to inhabit the plant's root nodules, forming the root nodule symbiosis. The legume plants provide the

Rhizobium species with carbon and energy sources in the form of sucrose and/or other organic compounds, while the bacteria help the plant to convert atmospheric nitrogen into ammonia. The ammonia produced is then converted to ammonium ions by the plant's own enzymes, which is used to synthesize amino acids and other compounds essential for the plant's growth and development.

The plant can also use the ammonia to make nitrogenous fertilizers, which can be stored in its leaves, stems, and roots for later use. Thus, the successful interaction between Rhizobium species and leguminous plants helps the plant to fix atmospheric nitrogen into ammonia, which is essential for its growth and development.

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An automated equipment was used to do a platelet determination, and a very low number was discovered. When calculated from the stained blood film, the platelets seemed sufficient. D2 mice offer the most plausible reason for this disparity.

RBC and PLT counts may be performed using an automated hematology analyzer, however when D2 mouse samples are being utilized, a suitable technique should be used. Red blood cell, mouse, platelet, automated hematology analyzer, and keywords.

When platelets are stimulated, they become spherical with a hypogranular cytoplasm and discharge tiny particles. This may lead to the erroneous identification of platelets when utilizing automated hematology analyzers owing to their distorted appearance. An EDTA sample has an automated platelet count of 58x10^3 uL. The blood smear's platelet estimation seems normal.

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Answer:  Northern Hemisphere

Explanation:  The March equinox heralds the arrival of spring in the Northern Hemisphere and autumn in the Southern Hemisphere . On this day, the sun rises due east and sets due west.

In the Southern Hemisphere the equinox occurs on September 22 or 23, when the Sun moves south across the celestial equator. According to the astronomical definition of the seasons, the vernal equinox also marks the beginning of spring, which lasts until the summer solstice (June 20 or 21) in the Northern Hemisphere

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The given statement "A definitive host is an animal host in which an immature parasite develops and reaches sexual maturity" is true because a definitive host is a host that harbors the adult, sexually mature, phase of the parasite's life cycle.

Definitive hosts are the final host in which a parasite reaches maturity and undergoes sexual reproduction. A definitive host is a host that harbors the adult, sexually mature, phase of the parasite's life cycle. The life cycle of a parasite is incomplete unless it goes through its adult or sexual phase in the definitive host.

A definitive host is usually the host in which the parasite reproduces asexually, and it is the only host that can transmit the infection to other hosts. For example, the human host is the definitive host for the protozoan parasites of Plasmodium vivax and Plasmodium falciparum, which are the causative agents of malaria.

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The steps on how graded potential is created in the cell body of a neuron are: Stimulus, Action potential, Graded potentials,  Summation, Axon.

Graded potentials develop in the cell body of neurons as well as in the sensory receptor. To get the sensory information to the central nervous system, the graded potential should be converted into an action potential. The steps on how graded potential is created in the cell body of a neuron are:

1. Stimulus: A sensory receptor is activated by a stimulus. The stimulus can be heat, light, touch, or sound.

2. Action potential: The sensory receptor sends an action potential, which is an electrical signal, down the neuron.

3. Graded potentials: Graded potentials then develop in the cell body of the neuron. Graded potentials are small electrical signals that change the neuron's membrane potential.

4. Summation: The graded potentials' summation causes the membrane potential of the neuron to change enough to generate an action potential.

5. Axon: The action potential is sent down the axon to the synapse. The graded potential is generated due to the movement of positively charged ions, usually sodium, into the cell or negatively charged ions, like chloride, outside of the cell. The influx of ions into the cell causes depolarization of the cell, which leads to the development of a graded potential.

Hence, The steps on how graded potential is created in the cell body of a neuron are: Stimulus, Action potential, Graded potentials,  Summation, Axon.

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The type of heat that is more effective is an autoclave. The reason behind this is the fact that Bacillus subtilis endospores, the suspension of which takes less than 10 minutes to get destroyed in an autoclave, is the most resistant type of bacterial endospore.

Bacterial endospores are among the most resistant forms of life on Earth, they have a remarkable ability to survive in adverse conditions such as extreme temperatures, radiation, and chemicals. The endospores of Bacillus subtilis have been found to be particularly resilient and can survive in a dormant state for years if not decades.This means that the dry heat may not be able to penetrate the endospore to kill it as compared to an autoclave. The higher the temperature, the more effective the destruction of bacteria is. Heat is an effective method for destroying bacteria, and it can be used in many different ways.

The reason behind this is the fact that an autoclave operates under high pressure, which allows it to achieve high temperatures that can penetrate through the endospores of Bacillus subtilis and destroy them more effectively. The dry heat, on the other hand, lacks the pressure required to achieve such temperatures, which is why it takes a longer time to kill the endospores.

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The dyes used in gel electrophoresis are usually negatively charged because they move towards the positive electrode. The positively charged particles are attracted to the negative electrode. Hence, it can be inferred that the dyes tested were negatively charged in gel electrophoresis.

In the gel electrophoresis apparatus, the dyes are tested positively or negatively charged. It is known that the apparatus creates an electrical field with positive and negative poles at each end. The charged particles are separated based on the strength of the charge they possess.

The gel electrophoresis is a technique that helps in the separation of DNA or RNA molecules based on their size and charge. The samples are loaded into a well that is created in a gel and exposed to an electric field.

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The bones, muscles, nerves, and blood arteries in salamanders' limbs can regenerate entirely. Both mitosis and differentiation are necessary for salamander limb regeneration.

Because the daughter cells will perform the same functional tasks as the parent cells, it is crucial that they share the same genetic makeup as the parent cells. Without the proper genetic make-up, the cell might not be able to live or even function properly.

Mitosis produces brand-new cells that are genetically identical to one another. Mitosis aids in organism growth and repair.

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The type of protein coat you will find on the outside of a vesicle that is targeted to the ER at the time that it buds off the Golgi apparatus is the COPII protein coat.

COPII protein coats are used in vesicular transport from the rough endoplasmic reticulum (ER) to the Golgi apparatus, where they coat vesicles that bud from the transitional endoplasmic reticulum (ER) and are transported to the cis-Golgi.

The endoplasmic reticulum (ER) is a cell organelle that plays a role in a variety of cellular activities. The endoplasmic reticulum is made up of two distinct regions, the rough endoplasmic reticulum, and the smooth endoplasmic reticulum. The rough endoplasmic reticulum is distinguished from the smooth endoplasmic reticulum by the presence of ribosomes on its surface.

The Golgi apparatus, also known as the Golgi complex, is another organelle in eukaryotic cells. The Golgi apparatus receives and processes proteins and lipids synthesized in the endoplasmic reticulum. It then sorts and distributes the processed molecules to their proper locations inside and outside the cell.

The COPII protein coat is found on the outside of a vesicle that is targeted to the ER at the time that it buds off the Golgi apparatus. COPII coats vesicles that bud from the transitional endoplasmic reticulum and are transported to the cis-Golgi.

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When comparing the large flightless birds (rheas, emus, and ostriches), the major question is the differences between them. All three of these birds are found in different parts of the world, with rheas being native to South America, emus to Australia, and ostriches to Africa. Furthermore, there are notable differences in their physical characteristics, most notably size.

Ostriches are the largest, weighing up to 300 pounds, while rheas and emus weigh much less. Additionally, the two types of rheas—greater and lesser—are further distinguished by the color of their wings. Lastly, the behaviors of these birds also vary. Ostriches can run up to 45 mph and use their powerful legs for defense, while rheas and emus cannot run as fast and use their strong feet and claws to ward off predators. All three species are omnivorous, though they have different diets.

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Answer:  Replication

Explanation:

The process is called DNA hybridization, and it occurs when two strands of DNA from different sources interact with each other. During this process, each strand of DNA bonds with a complementary strand from the other source, forming a double-stranded region. This interaction is enabled by the fact that DNA is a double helix, meaning that each strand can bind with another strand that has the same base sequence in reverse order.

The double-stranded region created during DNA hybridization is called a hybrid, and it is the basis for many of the genetic processes in living organisms. In addition, the double-stranded region created during DNA hybridization can be used to produce new genetic sequences through a process called recombination.

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This would mean that the common ancestor of all modern primates did not exist in South America at the time of the split and that the primates in South America evolved from a different lineage.

If scientists discover that South America split from Africa well before the evolution of the common ancestor of all modern primates, it would suggest that the primates in South America evolved independently from those in Africa. This would mean that the common ancestor of all modern primates did not exist in South America at the time of the split and that the primates in South America evolved from a different lineage.

This finding could have important implications for our understanding of primate evolution and biogeography. It would suggest that primates have a more complex evolutionary history than previously thought, and that their distribution and diversification may have been influenced by a variety of factors, including continental drift, climate change, and ecological interactions.

Additionally, it could help to explain some of the unique characteristics of the primates in South America, such as the presence of the platyrrhine dental formula (2133) and the absence of a number of primate groups that are found in other parts of the world. It could also shed light on the processes that drove the evolution of primates in both South America and Africa, and how these processes may have influenced the diversification of primates more broadly.

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The suprachiasmatic nucleus (SCN) is the brain structure that is bilaterally damaged or injured, which selectively disrupts circadian rhythms and thus sleep.

What is a suprachiasmatic nucleus (SCN)?

The suprachiasmatic nucleus (SCN) is a small region of the brain that serves as the body's primary circadian pacemaker. It's a portion of the hypothalamus that is situated directly above the optic chiasm.

The suprachiasmatic nucleus (SCN) gets visual input from the retina via the retinohypothalamic pathway (RHT), which it employs to regulate circadian rhythms.

Circadian rhythm is a biological process that repeats approximately every 24 hours. It regulates physiological and behavioral cycles, such as the sleep-wake cycle. The circadian rhythm of an organism can be disrupted by a variety of factors, including genetic mutations, environmental influences, and illnesses such as Alzheimer's disease and Parkinson's disease.

Circadian rhythms are disrupted in patients with bilateral suprachiasmatic nucleus (SCN) damage. SCN damage is also linked to insomnia, excessive daytime sleepiness, and other sleep disorders. In addition, they may have difficulty adapting to shift work or jet lag. These symptoms can have a significant impact on a person's quality of life.

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Many industries can benefit from biotechnology, such as agriculture, medicine, energy, and environmental science.

Biotechnology involves the use of living organisms or their products to improve/ develop processes and products in various industries. Many industries can benefit from biotechnology like agriculture, medicine, energy, and environmental science.

One industry that may not benefit as much from biotechnology is the mining industry. The primary goal of the mining industry is to extract natural resources from earth, such as minerals, metals, and fossil fuels. Biotechnology may not have many direct applications in this industry, as the focus is more on geology, chemistry and engineering.

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Genetic drift and inbreeding are both important processes in the conservation of endangered species as they produce distinct organisms that might have survival traits.

Genetic drift occurs when the gene frequencies of a population shift due to random events, such as when a small subset of the population is isolated. This can cause the population to become genetically distinct from the original population. Inbreeding is the process of mating related individuals, which can result in the concentration of rare alleles or the production of offspring with reduced fertility or survival rates.

Both processes can help to preserve rare genes in a species and reduce the effects of genetic drift.

In the case of endangered species, conservationists can take advantage of these processes to protect rare alleles from being lost due to genetic drift.

By pairing related individuals, conservationists can reduce the frequency of deleterious alleles, which could be harmful to the species' survival. Inbreeding can also help to preserve rare genes by allowing them to be passed down to future generations.

Genetic drift and inbreeding are important processes in the conservation of endangered species.

By taking advantage of these processes, conservationists can help to preserve rare alleles and reduce the effects of genetic drift. This, in turn, can help to ensure the long-term survival of the species.

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The most superior bone of the vertebral column is the atlas, which is denoted as the first cervical vertebra.

The occipital bone of the skull articulates with the atlas, which is situated at the top of the vertebral column and permits head nodding. It is a ring-shaped bone that has no body that helps the head move freely while supporting the weight of the skull.

The most noticeable vertebra in the cervical region is the vertebra prominens, commonly referred to as the seventh cervical vertebra. It is situated close to the base of the neck. The most inferior bone of the vertebral column, commonly referred to as the tailbone, is the coccyx, which is made up of four fused vertebrae.

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when a pure tall plant is crossed with a pure short plant, all of the resulting offspring are tall. When the offspring from that cross is self-fertilized, the phenotypic ratio is 3:1.

When the offspring generation of problem 1 is crossed with the tall plant from a tall lineage, the following phenotypes and ratios for the offspring are produced. The phenotypes are TT and Tt with a ratio of 1:1, respectively. Thus, the offspring generation will have a 1:1 ratio of TT to Tt.

Tallness is a dominant characteristic that appears to be inherited by simple Mendelian genetics. It is dominant over shortness and is designated by a capital T. On the other hand, shortness is a recessive trait that is designated by a lowercase t.

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The phenomenon that meristems can differentiate into each of the tissue systems of a plant is called totipotency.

What are meristems?

The meristem is a region of a plant where growth occurs. It is a group of undifferentiated cells that are capable of division and differentiating into various plant organs. It is present in the roots and shoots of a plant. The meristem is critical to the plant's development, as it is responsible for creating new cells that will eventually form different organs in the plant.

Meristematic cells have the unique capacity to divide and differentiate into different cell types, and they also have the ability to regenerate a whole plant from a single cell under specific conditions.

The phenomenon that meristems can differentiate into each of the tissue systems of a plant is called totipotency. This means that the undifferentiated cells in the meristem have the potential to develop into any type of tissue found in the plant. Thus, meristems are totipotent.

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Answer: It's C.

Explanation: The dodo once lived on an uninhabited island where there were no predators, so they evolved and became flightless and slow.

Then one day, the Dutch came and brought dogs with them. The dodos were too slow. The eggs got stolen and eaten, dodos were killed, and the dodos didn't repopulate fast enough, so they went extinct.

Pollution is the result of hunting, fishing, and material collection at rates that are higher than the capacity of populations in biodiversity to recover it. Option 2 is Correct.

While habitat fragmentation is the division of habitat after correcting for habitat loss, habitat loss typically refers to the reduction in the geographical area of natural habitat, including forest, grassland, desert, and wetlands.

When an area's state deteriorates as a result of pollution, invading species, or excessive use of natural resources, that area is said to have been degraded. Examples include streams becoming damaged by runoff of sediments and pollutants from nearby farms and prairies being overrun by woody plants like eastern red cedar.

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Correct Question:

Hunting, fishing, and gathering material at rates that exceed the ability of populations to rebound is called and is a thread to biodiversity group of answer choices

1. invasive species

2. pollution

3. overharvesting habitat

4. loss climate change.