explain what is meant by 'double circulation' of blood​

Binary fission differs from the division of eukaryotic cells in that a spindle is involved in chromosome segregation in eukaryotic cells.

Binary Fission :

Hence, option e is correct

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Answer:

Twice.

Explanation:

If a soil with 3% moisture has twice the rate of erosion as compared to the soil having 7% moisture if both experience same speed of wind i. e. 15 m/s. This is because moisture held the particles of soil tightly with each other and prevent erosion in the soil so if the moisture becomes half in the soil then the rate of erosion is twice or doubled at constant wind speed.

Answer:

Spontaneous repair of peripheral nerves is made possible by Schwann cells, which surround the nerve fibers with an insulating layer, myelin. This fatty layer protects the nerves and increases the speed of transmission of nerve impulses.

Explanation:

Schwann cells are small elements that are created in order to form a layer around the axon of the nerves of the peripheral system. These cells surround the axon by an extensive layer of myelin that is discontinued by the presence of Ranvier's node. Myelin is a single cell organelle, a modified extension of the plasma membrane of the Schwann cell in the peripheral nerve. Its elaboration depends on the regulated expression of a set of genes in the myelinating glia, for which the Schwann cells require axonal contact, as well as to maintain the expression of these genes. Myelin acts as an electrical insulator that facilitates the conduction of the nerve impulse, it helps when the axons must regenerate, that is, when there is some injury or disease that prevents cell transmission. The goal is to help the nerve regenerate and grow again to reach the target tissues. Once the nerve is repaired, the cell regains its ability to produce myelin to cover the nerve with the insulating layer and allow the correct transmission of nerve impulses.

Answer:

The reason why is because in the process of reproduction; there are some mistakes in DNA replication (out of billions of base pairs about 120,000 mistakes). This is what brings us so much variation in organisms.

Answer:

A. The marble rock is prettier than the quartz rock

Explanation:

This is an opinion, whereas the other answers are facts.

Positive feedback regulation in biological systems is responsible for amplifying physiological responses. This feedback regulation system plays a significant role in maintaining homeostasis. So, option c) It serves to amplify physiological responses and a) It helps maintain homeostasis are correct.

Positive feedback regulation in biological systems is a regulatory mechanism in which the output of a process strengthens or enhances the same process. It amplifies the biological process, intensifying the physiological responses. In a positive feedback system, the response to the stimulus increases instead of decreasing, as is the case in negative feedback regulation.

Positive feedback mechanisms occur in several biological systems like blood clotting, childbirth, and lactation. During childbirth, uterine contractions initiate the positive feedback mechanism that leads to the release of more oxytocin, which intensifies contractions. In lactation, the baby's suckling initiates the positive feedback mechanism that triggers the release of more prolactin hormone, which causes the production of more milk.

The statement d) Positive feedback mechanisms often occur alongside negative feedback mechanisms in biological systems is incorrect. Positive feedback mechanisms and negative feedback mechanisms are two opposite types of regulation systems that function differently. Positive feedback mechanisms enhance a process, whereas negative feedback mechanisms inhibit a process, and both work in opposite ways.

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Both GPCRs (G protein-coupled receptors) and RTKs (receptor tyrosine kinases) are transmembrane proteins with an extracellular domain that binds a signal and an intracellular domain that acts to transmit the signal (option c).

GPCRs are activated by ligands such as hormones, neurotransmitters, and sensory stimuli.  RTKs are activated by growth factors and other signaling molecules,

Both GPCRs and RTKs have different mechanisms of action but they share a common structural feature, that is : they are both transmembrane proteins with the extracellular domain that binds signal and intracellular domain that acts to transmit the signal.

This allows them to relay signals from outside the cell to the inside of the cell, where they activate intracellular signaling pathways and ultimately leads to cellular response.

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From the photo, it can be concluded that there are both endospores and vegetative cells present. The endospores can be seen as smaller cells staind in blue, while vegetative celles are staind in red.

Answer:

C

Explanation:

This type of mutation is called a silent mutation. Despite a nucleotide in the codon being changed, the original codon and the mutated codon still code for the same amino acid. This results in no observable effect on the characteristics of the organism.

Answer:

it is true. Watersheds can be as small as a footprint or large enough to encompass all the land

Directional selection is the type of selection that is shown in the graph.

Directional selection is a type of natural selection when a single phenotype is favored, resulting in a steady shift in allele frequency in one direction. Populations frequently go through directional selection, which chooses phenotypes at one extreme of the range of existing variation, when the environment changes.

The evolution of the peppered moth in eighteenth- and nineteenth-century England is a prime illustration of this kind of selection. Prior to the Industrial Revolution, the moths' mainly pale color allowed them to blend in with the lichens and light-colored trees in their environment. The trees darkened as soot poured from industries, making it simpler for raptors to identify the light-colored moths.

Disruptive selection (or diversifying selection) is a type of natural selection in which traits with extreme values are preferred over those with moderate values.

Stabilizing selection is a kind of natural selection where genetic diversity declines as the population stabilizes on a specific attribute value.

Correct question:

Which type of selection is shown in the graph?

Directional selection

Disruptive selection

Stabilizing selection

The image of the graph is attached below.

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Other things but the independent variable must remain constant because; with too many variables you can't determine what caused the results.

The independent variable is the variable that is changed in an experiment. Recall that every experimebt must have a dependent and independent variable.

Everything but the independent variable must stay constant because because with too many variables you can't determine what caused the results.

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A close dating between two one of a kind kinds of organisms is referred to as symbiosis.

Symbiosis is a large time period that describes the interplay and relationship among two organisms of different species, which may be beneficial, harmful, or impartial for one or both of the organisms concerned.

There are different styles of symbiotic relationships:

Mutualism: Both organisms enjoy the relationship. An instance is the connection among bees and plant life, where bees gather nectar from flora for food whilst inadvertently pollinating the flowers.

Commensalism: One organism advantages, while the other is neither harmed nor benefited. For example, positive species of birds building nests in bushes enjoy the protection and guide of the tree, even as the tree is unaffected.

Parasitism: One organism blessings at the same time as the opposite is harmed. An instance is a tick attaching itself to a mammal to feed on its blood, benefiting the tick however harming the host.

Thus, this is the close relationship kinds of organisms.

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Answer:

White blood cells: Serving as an army against harmful bacteria and viruses, white blood cells search for and attack and destroy germs to keep you healthy.

Explanation:

Answer: There are 20 different amino acids found in living organisms.

Explanation:

Blood types in humans are a result of the interaction of alleles A, B, and O, which determine the type of antigens present on the surface of red blood cells. The A and B alleles are both dominant, while the O allele is recessive.

Each individual inherits one allele from each parent, leading to different combinations and blood types. When an individual has two A alleles (AA) or one A and one O allele (AO), they exhibit blood type A. Similarly, having two B alleles (BB) or one B and one O allele (BO) results in blood type B.

The AB blood type occurs when an individual inherits both the A and B alleles (AB), demonstrating codominance, where both alleles are expressed simultaneously. Lastly, the O blood type occurs when a person has two O alleles (OO), with both A and B alleles being absent.

The presence of specific antigens on red blood cells is crucial for blood transfusions since it determines compatibility between donor and recipient. Incompatibility can trigger an immune response, leading to serious health complications.

Understanding the genetic basis of blood types allows for proper identification and matching of blood types for transfusion purposes, helping to ensure the safety and well-being of patients.

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Answer: Cash receipts for all commodities are forecast to decrease $12.3 billion (3.3 percent) to $358.3 billion (in nominal terms) in 2020. Total animal/ ...

Explanation:

Answer:

You would find muscle and fibrous tissue which would provide structure. I hope this helps! :)

Answer:

The diaphragm is primarily composed of muscle and fibrous tissue.

Explanation:

hope this works

Explanation:

For a gene that is expressed in a dominant and recessive pattern, homozygous dominant and heterozygous organisms will look identical (that is, they will have different genotypes but the same phenotype), and the recessive allele will only be observed in homozygous recessive individuals.

Answer:

What do the following results from the TEST FOR LIFE tab indicate about the sample? The sample produces ATP.

The correct answer is option b. The air pressure will decrease because the air particles are spread out.

What is air pressure ?

Air pressure is the force exerted by the weight of air molecules on the surface of the Earth or any other object immersed in the atmosphere. It is the weight of the air molecules above a given point and is typically measured in units of pressure such as pounds per square inch (psi), millibars (mb), or pascals (Pa). Air pressure is affected by a number of factors, including altitude, temperature, humidity, and weather patterns. Changes in air pressure can have significant impacts on weather patterns and can also affect human health and well-being.

Therefore , When the air temperature increases, the air particles gain energy and move faster, increasing the distance between the particles. This results in a decrease in air density, which in turn causes a decrease in air pressure. Conversely, a decrease in temperature would cause the air particles to move more slowly and become more densely packed, resulting in an increase in air pressure.

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This text is asking about the relationship between air temperature and air pressure. Air pressure refers to the force exerted by the weight of air molecules in the Earth's atmosphere, while air temperature refers to the measure of how hot or cold the air is.

The text provides four options for what happens to air pressure in an area if the air temperature increases. The first option suggests that air pressure will increase because the air particles are packed together. This is a correct statement, as an increase in temperature causes the air molecules to move faster and spread out, which results in a decrease in air pressure. Conversely, a decrease in temperature causes the air molecules to move slower and pack closer together, which results in an increase in air pressure. Therefore, the correct answer to this question is "The air pressure will decrease because the air particles are spread out."

Answer:

it decreases

Explanation:

Answer:

I think the air pressure will decrease as you go higher in the atmosphere.

The cell is the basic unit of structure and function of all living organisms.

They form the structure of the body, take  nutrients from food, convert them into energy and perform special functions. Cells also contain the body's genetic material and can make copies of themselves.

Cells must perform 11 main functions  to sustain and preserve life: absorption, digestion, respiration, biosynthesis, excretion, excretion, secretion, movement, excitability, homeostasis and reproduction.

A cell is surrounded by a membrane with receptors on its surface. Inside the  cell are several small structures, including the nucleus, mitochondria, endoplasmic reticulum, and the Golgi complex. They all have specific functions in the cell.

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Answer:

protein synthesis

Explanation:

DNA provides the code for protein synthesis. This DNA code consists of the instructions needed to make proteins and molecules which are essential for our growth, development, and health.

Answer:

D

Explanation:

I got it right ;P

Answer:

it be D

Explanation: