At which depth does shoaling usually occur? less than 30 ft more than 30 ft exactly at 150 ft exactly at 100 ft

The poster illustrating the models of stem cell division and differentiation is found in the attachment.

What are stem cell division and differentiation?

Stem cell division produces daughter cells. These daughter cells either develop into fresh stem cells or into differentiated cells with a more specific purpose, like bone, blood, brain, or heart muscle cells.

Through stem cell differentiation, a cell can become more specialized by switching from growth to specialization. This entails a series of modifications to metabolic activity, signal receptivity, membrane potential, and cell morphology.

Learn more about stem cell division and differentiation at: https://brainly.com/question/11850869

#SPJ1

According to the research, the correct option is mouth. For ingested foods, the first opportunity for enzymatic digestion occurs in the mouth.

What is enzymatic digestion?

They are proteins whose function is that they allow the digestion of food and the assimilation of nutrients and the decomposition of the different nutrients are secreted by the pancreas and go to the duodenum to exert their action, such as amylase, lipase.

In this sense, enzymes, since they are proteins that break down nutrients, are formed inside the cells present in the mouth and have a prominent role in all phases of digestion, which starts from the mouth with the saliva that contains enzymes for digestion, preventing the formation of toxins and other substances harmful to the digestive tract.

Therefore, we can conclude that according to the research, the correct option is mouth. For ingested foods, the first opportunity for enzymatic digestion occurs in the mouth.

Learn more about enzymatic digestion here: https://brainly.com/question/9083240

#SPJ1

the kidneys filter blood

messenger RNA (mRNA)
messenger RNA (mRNA), molecule in cells that carries codes from the DNA in the nucleus to the sites of protein synthesis in the cytoplasm (the ribosomes).

Alleles are described as alternate versions of a gene.

The correct answer is alternate versions of a gene.

In any given organism, genes are responsible for coding specific traits, and these traits can have different forms or variations. These variations are known as alleles. Each individual organism carries two alleles for each gene - one from its mother and one from its father.

These alleles determine the physical traits or phenotypes that an organism displays. When both alleles are the same, the organism is said to be homozygous for that gene, and when the alleles are different, the organism is heterozygous.

Some alleles are dominant, meaning that they will be expressed even if the organism carries only one copy of that allele. Other alleles are recessive, meaning that they will be expressed only if the organism carries two copies of the recessive allele.

Alleles are not to be confused with homologous chromosomes, which are pairs of chromosomes that contain the same set of genes but may have different alleles for each gene.

Environmental factors can also affect gene expression, but they are not alleles themselves. Alternate phenotypes are the different physical traits that can result from different combinations of alleles but are not the actual alleles.

For more such questions on gene, click on:

https://brainly.com/question/3452155

#SPJ11

the theme would be region

Parent cells made of sperm cells and egg cells

Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells
.

The correct statement about conservation biology is that the natural genetic diversity of species varies from species to species.

This means that different species have different levels of genetic diversity within their populations, which is an important consideration in conservation efforts.

Conservation biology is a field that focuses on understanding and protecting biodiversity and the natural environment. It encompasses various aspects of conservation, including the preservation of species, ecosystems, and genetic diversity.

The first statement, "The natural genetic diversity of species varies from species to species," is correct. Genetic diversity refers to the variation in genetic characteristics within a species' population. Different species have different levels of genetic diversity. Some species naturally have higher genetic diversity, which can provide them with a greater ability to adapt to changing environments, resist diseases, and maintain healthy populations. In contrast, other species may have lower genetic diversity, which can make them more susceptible to threats such as inbreeding depression or environmental changes.

The second statement, "When a species rebounds from near extinction to its original population numbers, genetic diversity also rebounds," is not necessarily true. When a species undergoes a severe population bottleneck or experiences a drastic reduction in numbers, it can lead to a loss of genetic diversity. Even if the species rebounds in terms of population size, the genetic diversity may not fully recover. It takes time and specific conservation strategies, such as genetic rescue or translocation, to restore genetic diversity in a recovered population.

The third statement, "Edge effects influence all species negatively," is incorrect. Edge effects refer to the changes in environmental conditions and species interactions that occur at the edges of habitats, such as where a forest meets a cleared area. While edge effects can have negative impacts on some species, such as increased vulnerability to predators or altered microclimates, they can also create new habitats and ecological niches that benefit other species. The impact of edge effects varies depending on the specific species and ecological context.

Learn more about genetic diversity here:

https://brainly.com/question/29766851

#SPJ11

A blood platelet drifts along with the flow of blood through an artery that is partially blocked. As the platelet moves from the wide region into the narrow region, the blood pressure: reduces

A blood platelet floats with the blood as it passes through a partially clogged artery. The pressure on platelet reduces as the platelet advances from the large zone to the narrow partially obstructed region.Thermal pressure is the term used in thermodynamics to describe the change in relative pressure that a fluid or solid experiences in response to a change in temperature at a constant volume. It has to deal with the Pressure-Temperature Law, often known as Gay Lusac's Law or Amontons' Law. When heated to a steady pressure, a gas expands, which causes it to cool through expansion. The requirement to add more thermal energy leads to the formula for specific heat at constant pressure: CP = CV + R per mole.

Learn more about blood platelet by using this link:

https://brainly.com/question/29561257

#SPJ4

Answer:

The intrusive rocks have small to medium grins size and extrusive have infinite t o microscopic texture. There cooling time may take sec to months while for intrusive its thousand of years.

Explanation:

They vary due to the intrusive-igneous rock forms as magma-pushes into the rock from below the earth's-surface and the extrusive-rock are formed when lave erupts onto the-surface. They are same as they are both made-crystals.

Answer:

Explanation:

A small piece of circular DNA called a plasmid is extracted from the bacteria or yeast cell.A small section is then cut out of the circular plasmid by restriction enzymes, ‘molecular scissors’.The gene for human insulin is inserted into the gap in the plasmid. This plasmid is now genetically modified.The genetically modified plasmid is introduced into a new bacteria or yeast cell.This cell then divides rapidly and starts making insulin.To create large amounts of the cells, the genetically modified bacteria or yeast are grown in large fermentation vessels that contain all the nutrients they need. The more the cells divide, the more insulin is produced.When fermentation is complete, the mixture is filtered to release the insulin.The insulin is then purified and packaged into bottles and insulin pens for distribution to patients with diabetes.

The DNA of an animal's somatic cell is transferred into an egg cell that has had its nucleus and DNA removed in order to create a clone. With the same genes as the cell donor, the egg develops into an embryo. The embryo is then placed inside the uterus of an adult female to develop.

What is DNA ?

A polymer made of two polynucleotide chains that coil around one another to form a double helix is called deoxyribonucleic acid. All known organisms and many viruses have genetic information in the polymer that is necessary for their development, operation, growth, and reproduction. Nucleic acids include DNA and ribonucleic acid.

The process of genetic engineering consists of three main phases. These include (1) isolating DNA fragments from a donor organism, (2) integrating an isolated donor DNA fragment into the genome of the vector, and (3) allowing the recombinant vector to develop in the proper host.

Selection, mutagenesis, conjugation, and protoplasm fusion are examples of conventional genetic modification techniques that have been used, particularly for microbial starter cultures. The latter is comparable to somatic hybridization in plant systems.

Thus, The DNA of an animal's somatic cell is transferred into an egg cell that has had its nucleus and DNA removed in order to create a clone.

To learn more about DNA, follow the link;

https://brainly.com/question/264225

#SPJ2

Answer: First, the plant has to take in water, sunlight, and oxygen. In turn, it produces carbon dioxide and glucose. Sunlight is the most necessary thing that a plant needs to complete this cycle.

Answer:

reasons are

. maintenance of chromosomes number

. development

. asexual reproduction

Explanation:

To duplicate the amount of DNA in the chromosomes and to divide into two genetically identical daughter cells

Answer:

Explanation:

Cells divide and reproduce in two ways, mitosis and meiosis.

Mitosis results in two identical daughter cells, whereas meiosis results in four cells.

Keys differences and similarities between the two types of cell division.

                                             Mitosis                  Meiosis

cells created:          two daughter cells      four daughter cells                                                          

Ploidy Creates diploid daughter cells Creates haploid daughter cells

Genetics  Daughter cells are                 Daughter cells are  .                                                                                 .                      genetically identical                  genetically different

Why is there a meiosis II but not mitosis II?

Meiosis II is generally regarded as being very similar to mitosis, except for the presence of two parent cells, instead of only one. In both meiosis I and II, cytokinesis occurs, and there are two daughter cells per parent cell.

Answer:

Blood transfusions: When a person needs a blood transfusion, it is important to match the donor blood type with the recipient's blood type to avoid serious complications. If someone is homozygous for a particular blood type, it means that they have two copies of the same allele, so their blood type will always be the same. If someone is heterozygous for a blood type, they have two different alleles, and their blood type can be more complex to determine.

Inheritance patterns: Understanding the inheritance patterns of blood types can help predict the likelihood of a child inheriting a certain blood type based on the blood types of their parents. For example, if both parents are heterozygous for a particular blood type, their child has a 25% chance of inheriting a certain blood type, a 50% chance of inheriting a different blood type, and a 25% chance of inheriting a third blood type.

Medical conditions: Certain medical conditions are associated with specific blood types. For example, people with type O blood are more susceptible to certain infections, while people with type A blood may have a higher risk of developing stomach cancer. Knowing someone's blood type can help identify their risk for certain medical conditions and may guide preventative care or treatment.

Answer:The cell produced at the end of meiosis contained half of the number of chromosomes as the parent cell

Explanation:hope this helps and happy hallowen :D

Answer:

A. Four haploid daughter cells that are genetically different.

Explanation:

The scenario that can increase the likelihood that a certain neuron will reach threshold and have an action potential is "temporal summation of opening ligand-gated ion channels and causing an influx of positively charged ions until it reaches the threshold."

Temporal summation occurs when the postsynaptic neuron receives multiple EPSPs in rapid succession, which can result in the depolarization of the neuron's membrane potential. If the depolarization is strong enough to reach the neuron's threshold, an action potential can be triggered.

Opening ligand-gated ion channels, such as sodium or calcium channels, can allow positively charged ions to enter the neuron, increasing the likelihood that the neuron will reach threshold and fire an action potential.

To know more about ligand here

https://brainly.com/question/14797888

#SPJ4

Archaeopteryx is a primitive bird from the late jurassic period that shares many characteristics with extinct theropod dinosaurs and modern-day birds. based on this information archaeopteryx would be a(n) transitional form.

What is Archaeopteryx?

In what is now southern Germany, Archaeopteryx lived in the Late Jurassic approximately 150 million years ago. At that time, Europe was an archipelago of islands in a shallow, warm, tropical sea that was much closer to the equator than it is today. The largest species of Archaeopteryx might reach lengths of around 0.5 m, making them roughly the size of a Eurasian magpie, with the largest individuals possibly growing to the size of a raven. Archaeopteryx shared more traits with other small Mesozoic dinosaurs than they did with contemporary birds, despite its small stature, broad wings, and presumed capacity to fly or glide. They particularly resembled the dromaeosaurids and troodontids in that they had long bone tails, sharp teeth in the jaws, and three clawed digits.

To learn more about Archaeopteryx from the given link

https://brainly.com/question/1328452

#SPJ4

Option B is correct. Helper T cells become activated by an antigen that was engulfed and digested by a phagocyte.

A phagocyte uses major histocompatibility complex (MHC) molecules to display antigen fragments on its surface after engulfing and digesting an antigen. These MHC molecules serve as a display platform for the helper T cells to view the antigen fragments.

T cell receptors (TCRs), specialized receptors found on the surface of helper T cells, are capable of recognizing the antigen-MHC complex. A helper T cell is activated when it comes into contact with an antigen-MHC complex that matches its TCR.

Helper T cells that have been activated discharge substances known as cytokines that prompt B cells and cytotoxic T cells to mount a coordinated immune response against the particular antigen.

Learn more about Antigen

https://brainly.com/question/30749774

#SPJ4

The most likely genetic mutation that results in Klinefelter's syndrome is non-disjunction during meiosis.

Non-disjunction occurs when chromosomes fail to separate properly during meiosis, the process of cell division that produces eggs or sperm. In the case of Klinefelter's syndrome, non-disjunction leads to the production of sperm cells with an extra X chromosome, resulting in the XXY genotype. When a sperm with an extra X chromosome fertilizes an egg, the resulting individual will have Klinefelter's syndrome.

During meiosis, homologous chromosomes normally pair up and separate, with each resulting cell receiving one copy of each chromosome. However, non-disjunction disrupts this process, causing the failure of chromosomes to separate correctly. As a result, one cell may receive an extra chromosome, leading to the presence of an additional X chromosome in the genotype.

Other genetic mutations mentioned, such as complete duplication of chromosomes during polyploidy, translocation during genetic replication, and crossing over during meiosis, do not directly result in the XXY genotype characteristic of Klinefelter's syndrome.

For more such answers on meiosis

https://brainly.com/question/25995456

#SPJ8

Answer:

Cells are responsible for the structures and functions of organisms.

Explanation:

The genetic term describing the alteration of multiple, distinct traits of an organism by a mutation in a single gene is pleiotropy.

What is pleiotropy?

Pleiotropy refers to the expression of various traits by a single gene. The expressed traits may or may not be related. Genes control the expression of multiple phenotypic traits. A phenotype is a characteristic that is physically expressed, such as color, body shape, or size. Unless mutations occur in genes, it is often difficult to discern which traits are the result of pleiotropy. Because pleiotropic genes control multiple traits, mutations in pleiotropic genes affect multiple traits.

Traits are usually determined by two alleles (variants of the gene). Specific combinations of alleles determine the production of proteins that drive processes involved in the development of phenotypic traits. A mutation in a gene changes the DNA sequence of the gene. Altering the sequence of a gene segment usually renders the protein non-functional. In pleiotropic genes, all traits associated with the gene are altered by mutation.

To know more about pleiotropy visit:

https://brainly.com/question/1596343

#SPJ4

Answer:

The Chiweenie

Explanation:

The Chiweenie is a mixed breed dog — a cross between the Chihuahua and Dachshund dog breeds

Answer:

Chiweenie

Explanation:

Hope This Helps

Gene's doctor taps him on the knee and his leg kicks out. The motion of his leg makes deep tendon reflex (DTR).

Lower motor neuron lesions have varying effects on tendon reflexes, also referred to as myotatic reflexes. The efferent limb of a tendon reflex will not function if a muscle loses all motor neuron innervation. Lower motor neuron lesions are frequently accompanied by hypoactive or absent reflexes.

This is frequently caused by the simultaneous activation of muscle spindle sensory afferent fibers inside peripheral nerves or roots, though.

Muscle stretch reflexes, which are deep tendon reflexes, are carried out by neuromuscular spindles. They are the only objective aspect of the clinical assessment. The patient may intentionally change their responses to the motor and mental examinations, their performance on sensory tests, or even their stride, for a number of different reasons.

To learn more about tendon reflexes refer to:

https://brainly.com/question/28289495

#SPJ9

Answer:

the cell was dicovered in 1665

Answer:

1665

Explanation:

The tension in the rope is calculated as 33.7 N.

Weight of sled and fossil, w = 972 N Inclination angle of slope, θ = 19.8°

Speed of sled, v = 1.92 m/s

Coefficient of kinetic friction between sled runners and snow, μ = 0.107

To find:

Tension in the rope, T The forces acting on the sled are the gravitational force (Fg), the normal force (Fn) and the force of friction (Ff). The normal force is perpendicular to the slope and equal to the component of the gravitational force perpendicular to the slope. The force of friction is parallel to the slope and opposite the direction of motion.

The net force acting on the sled is given by the expression:

F net = ma

Since the sled moves with constant velocity, a = 0.

Therefore, F net = 0. F net = Fg sinθ - Ff = 0⇒ Fg sinθ = Ff

Since the speed of sled is constant, work done by tension in the rope is equal to work done by frictional force.

Hence, T = Ff = μFn

Where F n = Fg cosθ = w cosθ

Putting all the values,

T = μw cos θ sinθ= sin 19.8°cos 19.8°= 0.3365T = 0.107 × 972 × 0.3365T = 33.7 N

The rope is 33.7 N. The given problem is related to the tension in the rope. The tension in the rope is calculated as 33.7 N.

To bring down the fossil safely down the slope, the tension in the rope is 33.7 N. The gravitational force is acting perpendicular to the slope and the force of friction is acting parallel to the slope. The normal force is the component of gravitational force acting perpendicular to the slope. The sled moves down the slope with a constant velocity. The force acting on the sled is equal and opposite to the force of tension in the rope. The force of friction is given by the expression,

Ff = μFn,

where Fn = Fg cosθ = w cosθ.

Therefore, the tension in the rope is calculated as 33.7 N.

To bring down the fossil safely down the slope, the tension in the rope must be 33.7 N.

To know more about fossil visit:

brainly.com/question/31419516

#SPJ11

Nitrogen naturally moves between abiotic (non-living) and biotic (living) compartments through processes such as nitrogen fixation, assimilation, ammonification, nitrification, and denitrification.

Through practices including the usage of fertilizers, the combustion of fossil fuels, and deforestation, humans have altered the nitrogen cycle.

Nitrogen fixation converts atmospheric \(N_2\) into ammonia \((NH_3)\), which plants can assimilate.

Animals obtain nitrogen by consuming plants. Ammonification occurs when decomposers break down dead organisms, releasing NH3.

Nitrification converts \(NH_3\) to nitrites \((NO_2^-)\) and nitrates \((NO_3^-)\), while denitrification returns \(N_2\) to the atmosphere.

Humans have altered the nitrogen cycle through activities like fertilizer use, fossil fuel combustion, and deforestation.

These actions increase nitrogen availability, leading to ecological consequences such as eutrophication of water bodies, loss of biodiversity, and increased greenhouse gas emissions, all of which can have long-lasting negative effects on ecosystems.

For more such answers on the Nitrogen cycle

https://brainly.com/question/1380063

#SPJ11

Answer:

The ocean

hope this helps

have a good day :)

Explanation:

Answer:

the ocean

Explanation:

more than 66 percent of the animals population exists in the sea  and a fact more than 2 million species are yet to be discovered

Answer:

13. deoxyribonucleic acids

14. DNA provides instructions for how each part of an organism will develop

15. instructions needed to make the proteins and molecules essential for our growth

16. nucleotides

17. adenine, guanine, cytosine, thymine

18. double helix

19. alternating sugar and phosphate groups

20. adenine pairs with guanine and cytosine pairs with thymine

The study of genes is called genetics.

The correct answer is mentioned below.

What is DNA?

It is a component that stores all the genetic information of the human.

According to the question,

13. deoxyribonucleic acids

14. DNA provides instructions for how each part of an organism will develop

15. instructions needed to make the proteins and molecules essential for our growth

16. nucleotides

17. adenine, guanine, cytosine, thymine

18. double helix

19. alternating sugar and phosphate groups

20. adenine pairs with guanine and cytosine pairs with thymine

Hence, the correct answer to the question is described.

For more information about the DNA, refer to the link:-

https://brainly.com/question/14688752

I will answer all of it for you.
A bridge may be defined as a structure built over a river, a dry valley, low land or an estuary or any depressed part of the land to provide a link between the two opposite sides. It is essentially a communication link on a road or railway track or a highway. Bridges especially over major rivers and in hilly and mountainous areas are very important civil engineering structures. Their role in socio-economic development and defence strategies can hardly be overemphasized. This is unlike tunnels, where alignment is primarily and essentially controlled by geological considerations. But, in the case of bridges also, the design, stability and durability depend, to a great extent, on the subsurface geological conditions that must be properly investigated and cautiously interpreted.
In any major bridge construction project, the designer is keen to place the bridge abutments and piers on as sound, strong and stable rock foundation below as possible. In most cases, if there is river bed below the water is covered by varying thickness of unconsolidated natural deposits of sand, gravels and boulders. Such loose materials are not safe as foundations for bridge piers for at least two reasons:
Firstly, piers placed directly on them would be unstable;
Secondly, the cover material is liable to be removed due to scouring by river water.
As such, the pier must be placed on stable foundation, preferably of rock, under a suitable thickness of cover material so that it is safe from scour by river water.
The height of pier from under the span to the foundation level, therefore, depends on the ‘depth of the bed rock’ below the river water.
Such sound bed rocks might be available within a depth varying from 5 to 20 meters below a river bed or they might not at all be available even up to 100 meter or more.
To achieve this, drill holes are made all along the centre line of the proposed bridge, even on the right or left of it, till they reach the sound rock sequence or up to a reasonable depth. Utmost care is needed not to mistake isolated big boulders buried underneath the river bed as the bed rock. Boulders are rocks but they are not bed rocks and cannot be trusted as foundations for bridge piers.
The very first rock encountered below the bed cover material may not be suitable as a foundation.
It should be kept in mind that three types of loads are to be borne by a bridge pier foundation:
i. The compressive, vertical loads due to the weight of the bridge span and that of pier material;
ii. The horizontal loads due to the thrust of the water flowing above as transmitted directly and through the pier;
iii. The dynamic, complex load, often inclined and shearing in character, due to heavy traffic on the bridge.
Consequently, the bed rock selected as foundation for the pier must be strong enough to bear the sum total of all these loads, not temporarily, but throughout the proposed life of the bridge.
The nature of the bed rock is commonly determined through study of petrological characters and engineering properties, especially the strength values, using the core samples obtained during drilling of test bore holes. In fact complete and very useful geological profiles could be prepared all along the centre line of the proposed bridge from the study of such core logs.
Most igneous and massive type of sedimentary and metamorphic rocks is quite strong, stable and durable as foundations for bridge piers and abutments. The group of weak rocks which might behave badly in the presence of water includes such types as cavernous limestones, chalk, friable sandstones especially with clayey cements, shales, clays, slates, schists and the layers of peat and compressible organic material.
Folding and faulting might cause some uncertainty in establishing a perfect geological profile but are not otherwise negative factors. Acute fracturing and profuse jointing is, however, undesirable at the foundation levels as these might cause settlement beyond the allowable limits.
When the bridge sites are located in the zones of seismic activity, the foundations are required to be designed for additional seismic loads as specified in the codes of respective areas.
In the glaciated areas, special care must be taken to establish the existence of drowned or buried valleys that might be filled by secondary material of most heterogeneous characters. In such cases a bed rock may be encountered only at great depth and it may be desirable to reach it through piles. Therefore the low bridge is better because;
It will cost less and be more structurally sound. The only thing is you would have to make a road down both sides of the valley but that would be more structurally efficient than trying to take the whole span of the valley on one bridge. The low bridge would also be better if there is water beneath the bridge in which is not stated.
The high bridge would cost a lot more and not be as structurally sound accordingly.

Answer: Just like the canaries in coal mines were used to provide a warning for miners of toxic, odorless gases in the mineshafts, lichens living in the tundra ecosystems can provide a warning of environmental changes by becoming more or less abundant. Since they are sensitive to changes in air quality and climate, they are an important tool to monitor the health of the tundra environment.

Explanation: Please give Brainlist.

Hope this helps!!!!