There would be 8 extinctions. we expect to go extinct since 1500 under normal circumstances
WHAT IS BACKGRROUND EXTINCTION RATE?
The term "background extinction rate," also known as "normal extinction rate," describes the number of species that, in accordance with non-anthropogenic (non-human) circumstances, would be expected to become extinct over time.“Millions of species years (MSY)” is a unit, which refers to the number of extinctions expected per 10,000 species per 100 years.2 E/MSY, or 2 extinctions per 10,000 species every 100 years, is a conservative estimate of the background extinction rate for all vertebrate creatures.Hence, keeping that in mind there would be 8 extinctions as there are ~40,000 species.
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Our modem system of classifying organisms is based on cider systems, mosdy that of
Carl Linnaeus. The system developed by Linnaeus classified organisms using what
characteristic?
B
C
D
Anatomical simlarnes
Kind of habitat
Mode of reproduction
Genetic makeup
Answer:
Anatomic similarities
Explanation:
how are the cells at the end of meiosis different from the cells at the beginning of meiosis? use the terms chromosome number, haploid, and diploid in your answer.
The cells produced during meiosis I are the ones that go through meiosis II.
Even though these cells are haploid and only have one chromosome from each homologous pair, they nonetheless have two sister chromatids. The sister chromatids split during meiosis II, creating haploid cells with non-duplicate chromosomes.
At the start of meiosis, cells contain diploid cells, which have all of the chromosomes.
As haploid cells, which have half as many chromosomes as diploid cells, meiosis produces four genetically different daughter cells.
Cells divide and reproduce using the mitosis and meiosis processes. After meiosis, four haploid daughter cells are still present; these cells can develop into either sperm or egg cells.
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Which structure receive sympathetic innervation from the pelvic splanchnic?
Answer: the bladder
Explanation:
How do you analyze and interpret data and evidence on the classification of organisms using tables, graphs, charts, diagrams, models, or other tools?
Analyzing and interpreting data and evidence on the classification of organisms can be done by using a variety of tools.
What is classification of organisms?Classification of organisms is the process of grouping living things into categories based on similarities. This process is known as taxonomy, and it has been used for centuries to better understand and describe the incredible variety of life on Earth.
Tables, graphs, charts, diagrams and models can all be used to help understand the relationships between organisms and how they are classified. Tables can be used to compare and contrast the characteristics of different species, while graphs, charts, and diagrams can be used to visualize the relationship between different groups of organisms. Models can be used to illustrate the process of how different organisms are classified. By using these tools, it is possible to gain a deeper understanding of the classification of organisms and how they are related.
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Meiosis cell division replicates a cell's DNA ___ then divides ____. None of the answer choices are correct once, twice twice, once twice; twice once; once
Meiosis cell division replicates a cell's DNA once then divides twice.
Meiosis is a method of cell division of germ cells that produces gametes including such sperm or egg cells in organisms that reproduce sexually. It consists of two rounds of segment that yield four cells with only each copy of the each chromosome.
Mitosis is a type of cell division that occurs in somatic cells as well as in the asexual reproduction of unicellular eukaryotic cells. Meiosis is a type of cell division used in sexual reproduction to produce gametes. Meiosis is critical because it ensures that almost all organisms produced by sexual reproduction have the complete set of chromosomes. Meiosis also generates genetic variation through the recombination process.
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one parent is type ab; the other parent is type o. a possible genotype for an offspring is:
Answer:
ob-
Explanation:
im not 100% sure but that seems the most reasonable
Bluegill sunfish breed in spring and early summer. Select the ultimate cause for the timing of breeding in these fish. View Available Hint(s) Breeding behaviors are caused by hormonal changes that occur in spring and early summer. Breeding is most likely to be successful in spring and early summer, when water is warm and food is abundant Bluegill sunfish have genes for neurological features that cause them to respond to increased day length with reproductive behaviors. Brooding is triggered by the effect of increased day longth.
Breeding is most likely to be successful in the spring and in the early summer, when water is warm and food is abundant.
Fish breeding method the breeding, nursing and switch of fish from one water body into another, also catching and retaining the reproducers for the recuperation, renovation and growth of fisheries aid.
Most fish species are inspired to reproduce within the springtime when the water warms up and the daylight lengthens.
You can mirror this each time in your private home aquarium with the aid of doing water modifications, growing the temperature putting at the aquarium thermometer, and steadily increasing the period of time the lighting are on.
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Sexual reproduction increases genetic variation in a population. Which is a way that meiosis and fertilization lead to genetic variation?.
The recombination and independent assortment in meiosis lead to the genetic variation in sexual reproduction.
By combining different gene variations, meiosis and fertilization produce genetic variety (alleles). The raw materials for natural selection are sometimes provided by these new combinations, which may make an organism more or less fit (able to survive and reproduce).
Offspring through sexual reproduction could have a very diverse genetic makeup. This variety results from random gamete union during fertilization as well as independent assortment and crossing-over during meiosis. Sibling genetic diversity is a result of sexual reproduction as well. Only one chromosome from each homologous pair is randomly included when a parent creates a gamete. Therefore, compared to its siblings, a child may inherit a distinct set of chromosomes (and alleles).
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Which is the reproductive strategy to produce as many offspring as possible in a
short time period in order to take advantage of some environmental factor?
k-strategy
l-strategy
r-strategy
s-strategy
The correct answer is C . r-strategy , reproductive strategy to produce as many offspring as possible in a short time period is r-strategy.
What are R and K's reproductive tactics?In population biology mathematics, the phrases "r-strategy" and "K-strategy" denote two positions on a spectrum where gamete production and lifespan engage in a compensatory exchange (the K-strategy).
What are two methods of reproduction?Sexual reproduction occurs whenever the genetic material from two persons is mixed to produce genetically diverse children, as opposed to asexual reproduction, which occurs when one individual creates genetically identical offspring.
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given that caffeine blocks the activity of camp phosphodiesterase, propose a mechanism by which caffeine ingestion leads to heightened alertness and sleeplessness. given that caffeine blocks the activity of phosphodiesterase, propose a mechanism by which caffeine ingestion leads to heightened alertness and sleeplessness. camp phosphodiesterase catalyzes the conversion of atp to camp . caffeine can prolong or enhance the effects of epinephrine by reversing the direction of the reaction performed by camp phosphodiesterase. camp phosphodiesterase breaks a phosphodiester bond in a camp molecule. caffeine can prolong or enhance the effects of epinephrine by inhibition of camp degradation by camp phosphodiesterase. caffeine blocks the activity of camp phosphodiesterase but initiates a signal transduction pathway that leads to heightened alertness and sleeplessness (effects similar to epinephrine action) by means of other messenger molecules. camp phosphodiesterase metabolizes camp into atp . caffeine can prolong or enhance the effects of epinephrine by inhibition of camp recycling by camp phosphodiesterase
A phosphodiester link in a cAMP molecule is broken by the enzyme cAMP phosphodiesterase. As cAMP phosphodiesterase is inhibited, caffeine can prolong or amplify the effects of epinephrine.
What occurs when phosphodiesterase is inhibited?Phosphodiesterase is unable to degrade cAMP and cGMP when it is inhibited. As a result, their concentrations inside the cell rise, which in turn causes calcium concentrations to drop.
What impact does a phosphodiesterase type 5 inhibitor have?The most often reported adverse medication responses include headache, flushing, stuffy nose, nasopharyngitis, and dyspepsia. PDE5 inhibitors have been associated with rare but serious reports of prolonged erections lasting more than 4 hours and priapism (painful erections lasting longer than 6 hours).
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Match the given characteristics to the corresponding prokaryotes.
spherical
rod-shaped
purple stain
pink stain
bacilli
arrowRight
gram-positive
arrowRight
gram-negative
arrowRight
cocci
spherical = cocci
rod-shaped = bacilli
purple stain = gram-positive
pink stain = gram-negative
henry has a mutation in the gene that codes for a certain blood protein. however, these proteins function normally. what best explains how this is possible?
A silent mutations occur when the change of a single DNA nucleotide within a protein-coding portion of a gene does not affect the sequence of amino acids that make up the gene's protein.
For example For example, AAA (codes for the amino acid lysine, Lys) being mutated to AAG (which also codes for Lys).
topic 2 what is adaptive radiation? what makes it a macroevolutionary process (rather than a microevolutionary process)?
Adaptive radiation describes how species spread out over new geographic space and then adapt. In time, speciation is possible which is a maco process.
Adaptive radiation is a process in which a single ancestral species diverges into multiple new species in response to the availability of new ecological niches. This can happen when a species expands into a new geographic area with a different set of environmental conditions or when a species evolves new adaptations allowing it to exploit the latest ecological niche.
As the ancestral species adapt to the new environment and evolves traits, it may eventually diverge into multiple new species through the process of speciation. Speciation is the process by which two populations of a species become reproductively isolated from each other and evolve into distinct, genetically distinct species. This can happen through a variety of mechanisms, such as geographic isolation, behavioral isolation, or reproductive isolation.
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a sea anemone has radial symmetry; its touch receptors and eye spots are located all around its circular body. a deer has large eyes and ears and a sensitive nose, all of which are clustered at the head end of its body. which difference in these two organisms most likely accounts for this difference in the location of sensory organs?
The difference in body shape between a sea anemone and a deer is the most likely cause of the difference in the location of their sensory organs. Sea anemones have radial symmetry, meaning they have a circular body with equal parts radiating outward from the center. This structure allows the anemone to have touch receptors and eye spots located all around its body.
In contrast, a deer has a body that is elongated and asymmetrical. It has a head at one end and a tail at the other. The deer’s large eyes, ears, and sensitive nose are clustered at the head end of its body, allowing it to have a better view of its surroundings and better detect potential threats. This arrangement is advantageous for the deer and allows it to have better survival chances by giving it a greater awareness of its environment.
The differences in body shape between a sea anemone and a deer account for the differences in the location of their sensory organs. The radial symmetry of the sea anemone allows it to have receptors and eye spots located all around its body, while the elongated and asymmetrical body of the deer allows its sensory organs to be clustered at the head end of its body. This arrangement allows the deer to better detect potential threats and increase its chances of survival.
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a typical muscle fiber is 2.0 cm long and has a cross-section area of 3.1×10−9m2. when the muscle fiber is stimulated, it pulls with a force of 1.2 mn.
The muscle fiber expends 4.80 x 10 J worth of energy. When the cross-sectional area of a typical muscle fiber is 3.1109m2 and it is 2.0 cm long.
What three types of muscle fibers are there?Slow oxidative (SO), fast oxidative (FO), and quick glycolytic are the three different types of muscle fibers (FG). All three types are present in the majority of a human's skeletal muscles, though in varied amounts.
When a muscle fiber contracts to a length, it works on:
W= F.d
F = 1.2 x 10-3N
d= (2-1.6)10-2=0.004m
W=1.210-3(0.004)=4.8 x 10 -6 J
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in order to prevent the restorative material from extruding beyond the gingival margin(s), you would like to place a matrix band. in which tooth would it be the most difficult to closely adapt this matrix band?
Anterior teeth have a variety of unique characteristics that make them more challenging to accurately place a matrix band.
The placement of a matrix band in order to prevent restorative material from extruding beyond the gingival margin(s) is a common dental procedure. In general, the most difficult tooth in which to closely adapt a matrix band is an anterior tooth, such as an incisor or canine
First, anterior teeth have a smaller surface area than posterior teeth, which can make it more difficult to correctly fit the matrix band. In addition, the anatomy of the anterior teeth, including their cuspal inclinations, grooves, and ridges, can impede the close adaptation of the matrix band. As such, it can be more difficult to properly form the matrix band to the contours of the tooth, as well as to ensure that the band is not too tight or too loose.
Second, it can be more difficult to precisely place the matrix band on an anterior tooth due to the presence of adjacent teeth. The contours of the adjacent teeth may make it difficult to correctly position the band, as well as to ensure that the matrix band is not impinging on the adjacent tooth. Moreover, the presence of other restorative materials, such as crowns or bridges, can further complicate the placement of a matrix band.
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Sh'qira reads an article about a family of wildcats. One of them had a mutation for tooth sharpness. Which is true of this mutation?
Sh'qira reads an article on a wildcat family. One of them possessed a mutation that made their teeth sharp. Which of the following statements regarding the mutant wildcat is accurate?
The tail of a young crawfish is lengthy. While its father has a tiny tail, its mother has a long tail. Which of these claims best describes the baby's lengthy tail? The tail-length gene was passed on to the young crawfish mother and father in equal amounts. Its long tail is made up of those genes connected together. Sh'qira reads a piece of writing about a pack of wildcats. One of them possessed a mutation that made their teeth sharp. The following is accurate regarding the wildcat with the mutation.
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Which of thee need to be done by a cientific committee before the drug i made available to the general public
Clinical trials need to be done by a scientific committee before the drug is made available to the general public.
What is a drug?
Any substance (apart from food) used to cure, prevent, or relieve the symptoms of a disease or other abnormal state. Drugs can also alter how the brain and the rest of the body function, resulting in alterations in mood, consciousness, thoughts, feelings, or behavior.
What are clinical trails?
Clinical trials are prospective biomedical or behavioral research studies involving human subjects that are intended to provide answers to particular questions about biomedical or behavioral interventions, including novel therapies and established interventions that call for more research and analysis.
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the mammalian digestive tract has been called an extension of the outside world that you enclose in your body what does this statement mean
The human GI tract has an average length of about 5 m and extends from the mouth to the anus in mammals. 17 The buccal cavity, esophagus, stomach, small intestine, and large intestine are the macroscopic compartments that are divided from one another by sphincters.
Is the digestive system considered to be external to the body?
Due to its open ends—the mouth and anus—which are both to the outside world—the alimentary canal is regarded as existing outside of the body. The mouth, pharynx, esophagus, stomach, and small and large intestines are all included in the canal.
Which of the following best describes how the digestive system works?
Digestion and absorption are the two functions of the digestive system. Food is broken down into small molecules during digestion, and these molecules are then absorbed by the body.
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To caue cancer proto-oncogene require…. Allele to be mutated and therefore are conidered…. The mutation reult in a…. Of function
The answer for the first blank is “one”.
The answer for the second blank is “dominant”.
The answer for the third blank is “gain” of function.
Proto-oncogenes need or demand only "one" allele (gene copy or variant) to be altered in order to cause cancer (changes in the deoxyribonucleic acid or DNA). One allele is all that is required for a proto-oncogene to develop into an oncogene that causes cancer. Since only one allele (or gene copy) is required to create an oncogene that induces cellular transformation and resulting in cancer, it is referred to as a "dominant" mutation. This type of mutation causes a "gain" in function since the affected cells can now divide uncontrollably and serve a new purpose.
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simple diffusion requires energy to move materials through the membrane that is why it is called passive ___
Simple diffusion is energy-free, making it passive. Simple diffusion allows for the passage of small, neutral molecules like oxygen, carbon dioxide, and water through cell membranes.
Passive transport is the most basic type of transfer over a membrane. A substance diffuses over a membrane through passive transport as it diffuses along its concentration gradient without requiring any energy from the cell. While assisted diffusion needs an ATP source, simple diffusion doesn't. B. Facilitated diffusion moves materials both with and against a concentration gradient, whereas simple diffusion merely moves material in the direction of a concentration gradient.
Passive transport is a phenomena that happens naturally and doesn't require the cell to use energy to move. Diffusion is the process by which chemicals travel passively from a region of higher concentration to a region of lower concentration.
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Correct Question:
Simple diffusion requires energy to move materials through the membrane that is why it is called passive?
what physical feature of tortoises did darwin notice differed from island to island?
Darwin observed that the vegetation and wildlife on the various islands varied as well. As an illustration, the sea turtles on one beach had shells that were saddle-shaped, whereas those on some other island had shells.
What are some illustrations of the theory of evolution by Darwin?The tortoises, for instance, varied slightly between each island. According to Darwin, the vice governor of the colony "could at once detect out of which island any individual had brought" by glancing at a turtle's shell.
What distinguishes pinzn tortoises from Duncan tortoises?Pinzn Islands (formerly Duncan Island) tortoises are "saddle-backed," which refers to the way their shells raise in the front like a saddle. They can more easily elevate their necks to feed on taller cacti because to this modification. Tortoises originating in Santa Cruz.
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tenostosis is: a.fusion of a tendon. b.suture of a tendon. c.pertaining to a tendon. d.ossification of a tendon.
Tenostosis is the conversion of a tendon into the bone, thus the correct answer is option (D). Ossification of a tendon.
Connective tissue includes tendons. They are less flexible than other types of fibrous tissue but have considerable strength like rope and are formed of collagen fibers. Tendons' primary job is to join bones and muscles so that the body can work as it should. Tendon sheaths are tissue tubes that encircle the tendons like a tunnel and are filled with lubricating fluid. The tendon sheath shields the tendon from excessive friction and fraying. Synovial fluid covers the sheath's interior surface. The tendon can move forward and backward as a result. This indicates that the lengthy tendons are shielded as they pass through the synovial joints by tendon sheaths. When the tendon gets converted or ossifies into bone the condition is called as tenostosis.
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complete the following sorting exercise to be sure you understand how the two break repair mechanisms are similar and different.
The two broken repair methods are similar and different when using NHEJ Repair just, HDR Repair alone, or combined NHEJ & HDR Repair.
ONLY NHEJ Repair - The process for repairing DNA double-strand breaks is called non-homologous end joining (NHEJ).
1. More prone to mistakes; more likely to cause indels and frameshift mutations.
2. Frequently generates non-functional null mutants.
3. Only calls for ligating broken DNA fragments.
HDR restoration is preferable for making complex replacements. ONLY 1. Both of these repair mechanisms are active in the majority of cells, but in the presence of a homologous template, the HDR route is often less effective than the NHEJ pathway.
1. The frequency increases following single-strand breakage.
2. Use an immature homologous chromosome as a template.
HDR & NHEJ Repair both; NHEJ is an error-prone method that joins broken ends of DNA, which frequently leads to a heterogeneous pool of deletions and insertions whereas HDR is a precise restoration mechanism that employs homologous donor DNA to mend DNA damage.
1. occurs after a DNA break (including breaks made by Cas9).
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in becoming human, the filmmakers posit that it is possible to determine the timeline for human ancestors losing their body hair by examining the evolution of which parasite?
They say humans lost their hair to ward off ectoparasites that live in their fur.
Strong evidence supports that the human lineage diverged from the lineage that gave rise to the great apes in Africa 6-7 million years ago. Evidence of tool-making dates back to about 3.3 million years ago in Kenya.
Prehistory is the period that began with the appearance of humans about 5 million years ago and ended with the invention of writing about 6,000 years ago. It is a long period of time divided into three phases Paleolithic-Neolithic and Metallic. Indeed, after the last common ancestor with chimpanzees and before the origin of Homo sapiens.
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what is the evidence that human activity is causing increased atmospheric co2 levels?
It is possible to measure the isotopic composition of atmospheric CO2, which demonstrates that the current source of CO2 addition to the atmosphere is the burning of fossil fuels.
How do we know that people are the cause of the CO2 in the atmosphere?Crisp notes that because carbon created by burning fossil fuels has a particular ratio of heavy-to-light carbon atoms and thus leaves a specific "fingerprint" that devices can analyze, scientists can be certain that increases in carbon dioxide are primarily the result of human activity.
What factors have caused the levels of atmospheric carbon dioxide to rise?By using fossil fuels and growing the economy, humans have aided in the rise in carbon dioxide levels. Another method is the burning that occurs during the removal of forests, which releases carbon dioxide.
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What is the part of the enzyme that the substrate fits to either be broken down or built up?
Hello,
I hope you and your family are doing well!
The part of the enzyme that the substrate fits into is called the active site.
The active site of an enzyme is a specific region on the surface of the enzyme that binds to the substrate and allows the enzyme to perform its specific chemical reaction on the substrate. The active site is typically located on a flexible loop or "lid" on the surface of the enzyme and is complementary in shape to the substrate.
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it is experimentally determined that the percentage of adenine in the dna of a particular organism is equal to approximately 32 % 32%. what proportion of guanine would be expected in this dna?
The percentage of guanine in a DNA molecule can be determined from the percentage of adenine. Each of the four nucleotide bases that make up DNA—adenine, guanine, cytosine, and thymine—are present in equal proportions. This means that if adenine is present at 32%, then guanine must also be present at 32%.
Adenine and guanine are two of the four bases of DNA, and they are complementary bases. This means that if one is present in a DNA strand, then the other must also be present. This is due to the fact that adenine always pairs with thymine and guanine always pairs with cytosine. Therefore, if the percentage of adenine in a particular organism’s DNA is 32%, then the percentage of guanine must be 32% as well.
The complementary relationship between the two bases is an important part of DNA and its structure. The base pairs hold the DNA strand together, and if one is missing, then the entire strand can unravel. This is why it is important to ensure that all four of the bases are present in the correct proportions in order for the DNA strand to remain intact and functional.
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Why amethyst is a mineral?
Answer:
Amethyst is a mineral because it is a naturally occurring inorganic solid that has a definite chemical composition and a characteristic crystal structure. These are the two main criteria used to classify a substance as a mineral. Amethyst is a type of quartz, which is a silicate mineral composed of silicon and oxygen atoms. It is typically purple in color and is used as a gemstone.
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Explanation:
Answer:
Amethyst is a mineral because it's a transparent, coarse-grained variety of the silica mineral quartz that is valued as a semiprecious gem for its violet colour. It is one of the most serene gemstones out there and is believed to bring spiritual healing, clarity, and cosmic energy to all those who wear it.
seedless plants a.help form communities.b.reduce soil erosion.c.add to soil depth.d.all of the above
Seedless plants reduce soil erosion, add soil depth, and help to form communities. Therefore, options A, B, and C are all correct (option D is the answer).
Seedless plants are plants that do not produce seeds. Instead, most of them primarily use haploid, unicellular spores to reproduce. Ferns, club mosses, and horsetails are some examples of seedless plants.
Seedless plants have an important role in the environment. Some of them are as follows:
They live in a new environment, such as newly exposed rock. When they die, their decomposed remains help to form a new, thin layer of soil, allowing other plants to grow in that area.They help to prevent and reduce soil erosion.While lichens and mosses tend to be the ones that create a new layer of soil, ferns add to soil depth.Learn more about seedless plants at https://brainly.com/question/19908918
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