Today, it's widely accepted that all of the two-legged meat-eating dinosaurs known as theropods— including t. rex and albertosaurus—had at least very simple fuzzy feathers covering their bodies. according to the tree you built, what distinguishes the feathers of modern birds and archaeopteryx from the feathers of other theropods?

Answer:

atom characters till 20

Explanation:

The mitochondria and chloroplasts in eukaryotic cells are descendant from bacteria. Ancient eukaryotic cells ingested these bacteria and they became part of the larger cell structure. Mitochondria and chloroplasts work symbiotically with the cell to provide it with energy. Because these mitochondria and chloroplasts used to be separate bacteria living on their own, they had their own small circular DNA like all bacteria do. When they became part of the eukaryotic cell they retained this DNA. Mitochondria and chloroplasts also reproduce similar to bacteria and replicate their DNA the same way. In this way, all mitochondria and chloroplasts in the organism contain the same circular small genome, just like all nuclei in the organism contain the same spiral DNA.

Final answer:

Mitochondria and chloroplasts have small genomes due to their origin as endosymbiotic bacteria and the transfer of many genes to the host cell's nucleus.

Explanation:

Mitochondria and chloroplasts have small genomes due to their origin as endosymbiotic bacteria. These organelles were once free-living bacteria that were engulfed by a host cell and established a symbiotic relationship. Over time, many genes necessary for their function have been transferred to the host cell's nucleus, leading to a reduction in the size of their genomes. Mitochondrial genomes are typically around 16,000 base pairs in length and encode about 40 genes, while chloroplast genomes are larger at around 120,000-170,000 base pairs and encode around 100 genes. The reduced size minimizes the risk of harmful mutations, safeguarding the stability of these vital components. So, the small genomes of mitochondria and chloroplasts aren't a sign of weakness, but a result of their remarkable adaptation.

Hi, I am a student from Louisiana who wrote a whole essay on this. I must say one of the biggest issues is the fact that it is slowly making us lose our land. The coastline is shrinking more and more everyday. Plus, drilling pollutes the water and since wetland water is freshwater, this is clearly not a good thing. Hope this helped!

The issue of drilling in Louisiana's wetlands involves environmental, legal, and economic aspects. The Clean Water Act of 1972 restricts drilling to protect wetlands, but recent court decisions are incrementally allowing more activities. Louisiana faces risks like habitat destruction and increased flooding, prompting ideas like storm surge barriers and sediment redistribution to mitigate the impacts.

Drilling in Wetlands Issues in Louisiana

The issue of drilling in wetlands in Louisiana encompasses environmental, legal, and economic facets. The Clean Water Act of 1972, specifically Section 404, is crucial in regulating activities like drilling in wetlands. This act initially curtailed the right to drain wetlands due to its negative impacts, such as carbon release, habitat destruction, increased flooding, and water quality deterioration downstream.

Over time, various court cases have redefined the jurisdiction of Section 404, incrementally allowing more drilling activities. However, since wetlands serve as natural filters and protectors against storms and flooding, Louisiana faces significant environmental risks, especially highlighted by the damage from Hurricane Katrina.

Moreover, ideas to mitigate these issues include building storm surge barriers and using well-planned levee breaks to redistribute sediment and rebuild the delta, though these solutions require substantial time and investment. Despite these efforts, challenges like nitrogen overload and eutrophication persist due to agricultural runoff, impacting the Gulf of Mexico's ecosystem.

During the capillary stagnation phase of hemorrhagic shock, blood flow is regulated by precapillary sphincters. If they are closed, due to influences like arteriole constriction, blood bypasses the capillary beds and flows directly from arteriole to venule.

During the capillary stagnation phase of hemorrhagic shock, the body regulates blood flow based on its needs, directed by nerve and hormone signals. This is controlled by small muscles called precapillary sphincters. If the sphincters are open, blood will flow into the associated branches of the capillary blood. But, if all of the sphincters are closed, blood will flow directly from the arteriole to the venule, bypassing the capillary beds.

Arteriole constriction is triggered by certain regulators causing the release of vasoconstricting substances like endothelins from endothelial cells. This constriction could cause the pre-sphincter muscle to close, temporarily halting blood flow to that region. This is one of the responses the body may have during the stagnation phase of hemorrhagic shock.

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During the capillary stagnation phase of hemorrhagic shock, the body induces vasoconstriction to preserve core perfusion by constricting blood vessels, including the arterioles and precapillary sphincters, through the release of endothelins and prostaglandins. This response decreases blood flow to the capillaries and can lead to tissue ischemia and hypoxia.

During the capillary stagnation phase of hemorrhagic shock, there are significant changes in blood flow regulation within the microcirculation. The precapillary sphincters, which are circular smooth muscle cells, play a critical role in this process. Under normal conditions, these sphincters regulate the flow of blood into the capillaries based on the metabolic needs of the tissue. If the surrounding tissue requires oxygen and needs to eliminate waste products, the precapillary sphincters will open to allow blood flow. Conversely, they close to restrict the flow when necessary.

In hemorrhagic shock, the body responds by triggering vasoconstriction, the narrowing of blood vessels, to preserve core organ perfusion by diverting blood away from less vital regions. This response involves the release of endothelins, which are powerful vasoconstricting peptides, and other constricting factors like platelet secretions and prostaglandins. The constriction of arterioles and precapillary sphincters can minimize blood loss and maintain arterial pressure, but it also leads to reduced perfusion of the capillary beds, creating a stagnation phase where blood flow is significantly compromised, potentially leading to tissue ischemia and hypoxia.

This is ataxia caused by a dysfunction of the cerebellum - a region of the brain involved in the assimilation of sensory perception, coordination, and motor control. Cerebellar ataxia can cause neurological problems such as: ... lack of coordination between organs, muscles, limbs, or joints.

The loss of muscle coordination is usually caused by damage to the cerebellum, a part of the brain responsible for coordination, precision and accurate timing of movements.

The loss of muscle coordination primarily results from damage to the cerebellum. The cerebellum is a part of the brain that plays a vital role in motor control. It does not initiate movement, but it contributes significantly to coordination, precision, and the accurate timing of movements. Hence, any damage to the cerebellum can cause problems in balance, posture, and coordination of voluntary movements. Loss of muscle coordination, also known as ataxia, results from damage to the cerebellum in the brain. The cerebellum is responsible for coordinating voluntary movements and maintaining balance. Damage to this area can be caused by various factors, such as brain injury, stroke, or certain neurological disorders.

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***see attached pic***

Correct answers:

femur (largest bone in the body, your entire upper leg)

fibula (one of the two major bones that make up your lower leg)

Incorrect answers:

clavicle (collar bone)

ulna (one of two major bones that make up your forearm)

The correct answer is: In prokaryotes, transcription and translation take place in the cytoplasm.  

Since there is no nucleus in prokaryotic cell (e.g. bacteria cell) transcription and translation are coupled processes that occur in the cytoplasm meaning that they occur simultaneously. Genetic material of the prokaryotes s called nucleoid and it is not located inside the membrane-bound organelle, thus it is in direct contact with ribosomes in the cytoplasm. Translation of messenger RNA by the ribosomes might occurred while mRNA is still being transcribed from DNA.

The gene pair is identical.

Answer:

Materials such as urea, water, and glucose are filtered out of the blood in the glomerulus, and water and glucose are then reabsorbed into the blood by the renal tubules.

Explanation:

A pair of Kidneys is the principal  excretory organ of the humans. Each kidney is composed of millions of its unit called nephrons. The nephron is the functional unit of the kidney as it filters out urea, water, and glucose from the bloodstream through the process of ultrafiltration. The filtered out material is called nephric filtrate. The filtrate then moves various tubules, called renal tubules where important molecules such as glucose, ions and water are reabsorbed into the blood.

Materials such as urea, water, and glucose are filtered out of the blood in the glomerulus, and water and glucose are then reabsorbed into the blood by the renal tubules.

The correct statement about nephrons is: Materials such as urea, water, and glucose are filtered out of the blood in the glomerulus, and water and glucose are then reabsorbed into the blood by the renal tubules.

The glomerulus filters materials like urea, water, and glucose out of the blood, while the renal tubules reabsorb water and glucose back into the blood. This process helps maintain proper balance of substances in the body. An example of this process occurs in the kidneys, where glucose, water, salts, ions, and amino acids needed by the body are filtered and reabsorbed in different parts of the nephron.

The process of circular motion in the Earth's mantle that causes the plates of the lithosphere to move is called convection.

The answer is B. convection

Hope this helps :)

Answer:

B) convection

Explanation:

Here's why: Convection currents are warm and rise above cooler air, which causes the circular movement in the mantle. This makes the plates of the lithosphere move.

Hey your answers are:

1. C

2.D

Answer:

Explanation:

Option C is Corpus collasum

Next is cerebrum

The answer to this question is tendon.

Tendon connect muscle to bone

Ligament connect one bone to another bone

Periosteum covers the outer surface of all bones /doesn't connect anything

After holding the weight for so long, the muscle would get tired, in an effort to tell the brain to stop holding the weight because the muscle fibers cannot handle it any more. Lactic acid is a by-product during muscle contraction that leads to the pain.

The answer is true.

The myelin sheath covers many axons in central nervous system (CNS) ( by oligodendrocytes) and in the peripheral nervous system (PNS) (by Schwann cells). Their function is to insulate axons and to increase the speed at which information travels from one nerve cell to another.

Nerve conduction velocity is specific to each individual and depend largely onboth  an axon's diameter and the level to which that axon is myelinated.

The correct answer is: c. through a conformational change of the receptor

When a ligand binds to receptor that is located on a cell surface, signal has to be transported into the cell. Usually, intracellular domain of the receptor changes its “shape” (conformation) which may make it active as an enzyme or available for other molecules binding. For example, the receptor may turn on signaling molecule inside of the cell and activates further chain reactions. Consequently, the cell responses by changing its behavior or characteristics.

Answer:

the answer would be.... B :)

Explanation:

I would say A becuase the rancher wants to use land that isn't his for his cattle.

Answer:

The correct answer is A. The governmental agency in charge of the aspect of farming described in the scenario is the Bureau of Land Management.

Explanation:

The Bureau of Land Management is an agency of the US Department of the Interior. The agency is responsible for managing around 1,020,000 km² of public lands, land owned by the state, as well as raw materials under a total of around 2,800,000 km² of public lands. Most of those tracts of land are in the western US, including Alaska. The agency's objectives include maintaining the health, diversity and productivity of the public lands for the use and benefit of Americans, also in the future.

reactants in photosynthesis are carbon dioxide, water, and sunlight.

products are oxygen and sugar(glucose)

hope this helps. ( ' _ ' )

Reactants: Carbon dioxide (CO₂), water (H₂O), and light energy.

Products: Glucose (C₆H₁₂O₆) and oxygen (O₂).

In photosynthesis, plants convert carbon dioxide, water, and light energy into glucose and oxygen. The reactants, which are the ingredients needed for the photosynthesis process, are carbon dioxide, water, and light energy. Carbon dioxide is taken in from the atmosphere through small openings called stomata in the plant's leaves. Water is absorbed from the soil through the plant's roots. Light energy is absorbed by chlorophyll, a pigment found in the chloroplasts of plant cells. These reactants undergo a series of complex chemical reactions in the chloroplasts to produce glucose and oxygen.

Glucose is the primary product of photosynthesis, and it is a type of sugar that serves as an essential source of energy for the plant. It can be used immediately by the plant for energy or converted into starch for storage. Oxygen is the byproduct of photosynthesis, and it is released back into the atmosphere through the stomata. Oxygen is essential for most living organisms on Earth as it is used in cellular respiration, the process by which cells generate energy from glucose.

In summary, carbon dioxide, water, and light energy are the reactants that fuel the process of photosynthesis, while glucose and oxygen are the products that are formed as a result of this process.

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Symptoms, pre disposing factors, pre disposition, genetics, lifestyle

There are many reasons for this. First of all, any water from Earth's surface can flow into the ocean due to gravity. There are also glaciers in the ocean that can melt. In the water cycle, the ocean, the atmosphere, and the land continuously exchange moisture among each other. Because weather patterns form and dissipate slower over the water than over the land, there is more circulation occurring in the atmosphere above the land. Therefore, there's more cloud formation.

Precipitation is less common on land than over the oceans primarily because a larger volume of water vapor is generated over the oceans. This is due to the vast ocean surfaces which facilitate evaporation. Since most evaporated water precipitates back into the oceans, less is available to be transported over land.

The water cycle describes the continuous movement of water on, above, and below the surface of the Earth, where it changes states among liquid, vapor, and ice. The oceans, which hold over one billion cubic kilometers of water, are the main source of evaporation due to the large surface area and abundant solar heat. About 400 thousand cubic kilometers of water vapor are produced from the oceans annually, but most of it falls back as precipitation over the ocean itself. Only about 40 thousand cubic kilometers are transported as atmospheric moisture from the oceans to land, where it adds to the 70 thousand cubic kilometers of recycled water from evapotranspiration on land. Consequently, the lesser amount of water vapor available over land compared to over the oceans results in less precipitation.

I'm pretty sure it is B, but don't take my word for it

Answer:

B

Explanation:

The correct answer is: b. phosphorus and nitrogen  

Plants use organic matter nutrients that produce by their own and thus we classified them as autotrophs (or self-feeders). But, they also require inorganic nutrients such as nitrogen and phosphorus and often one of them is special nutrient needed for growth and because of that called the limiting nutrient.

The fertilizers that people apply to farm fields, gardens and lawns contain phosphorus and nitrogen.

Answer:

B (Phosphorus and Nitrogen)

Explanation:

Plants are unique organisms that can absorb nutrients and water through their root system. An essential nutrient is one required by an organism for normal growth and development, but which it cannot manufacture on its own. Plant nutrients can be organic or inorganic depending on whether or not it contains carbon.

Because plants can manufacture all the organic nutrients they need, they have no essential organic nutrients, however, they need to take in specific inorganic nutrients to sustain their growth.

The soil supplies some of these inorganic nutrients in relatively large amount. These nutrients called MACRONUTRIENTS include Nitrogen, Phosphorus, Pottasium, Calcium, Sulfur, Magnesium etc.

Nitrogen is a major component of organic compounds (amino acids, nucleic acids; DNA and RNA, chlorophyll). Nitrogen-deprived plants become pale green or yellow, due to a lack of chlorophyll, a condition known as chlorosis.

Like Nitrogen, Phosphorus is involved with many vital plant processes. It is present mainly as a structural component of nucleic acids (RNA and DNA). It is also a vital part of Adenosine triphosphate (ATP) in all living things, including plants.

The following statement is false: MOST US STATES PROHIBIT THE IMPORTATION OF ANIMAL SPECIES LIKELY TO BECOME INVASIVE IF THEY ESCAPE INTO THE WILD.

Presently, most US states do not have any law, which prohibit people from bringing into the US animal species that are likely to become invasive.

Invasive plant and animals are a great source of problems in America. These species usually destroy habitats and native species, this usually throw the ecological communities out of balance. The government spend  as much as $120 billions every year to control these invasive species.

The right answer is "have a life cycle that alternates generations"

The alternation of generations (metagenesis) is a characteristic of plants' life cycle. A generation is a stage of multicellular development stemming from a cellular stage (spore or gamete) and producing a cellular stage (gamete or spore). The generation producing gametes is the gametophyte, and the generation producing spores is the sporophyte. In general, a gametophyte alternates with a sporophyte. When mature, the sporophyte produces spores.

D.grouping ?

im not sure.. but ihope it helps u dear :)

conic ,equal-area,Mercator

A,D,E

Explanation: I just did the Quiz.

Answer:

a d e

Explanation:

In mitosis cytokinesis occurs once in meiosis is occurs twice.

Mature human nerve cells (neurons) and muscle cells (muscle fibers) are permanently in a state called "G0" or the "resting phase."

The state is called the "resting phase" In this state, these cells have exited the cell cycle and are considered to be in a non-dividing or post-mitotic state. Unlike other cells in the body that can undergo cell division and replication, mature nerve cells and muscle cells generally do not undergo significant cell division or replace themselves through mitosis.

Once these cells have reached their mature and functional state, they typically remain in this state for the rest of an individual's life. This is because mature nerve cells and muscle cells have specialized structures and functions that are essential for their specific roles in the body. Their longevity and inability to divide or regenerate easily make them vulnerable to damage or degeneration, which can have long-lasting consequences.

However, it is important to note that certain conditions or injuries may stimulate limited regeneration or repair in nerve cells or muscle cells, albeit to a much lesser extent compared to other cell types. Nonetheless, in general, mature nerve cells and muscle cells are considered to be in a non-dividing state throughout a person's life.

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A, Egg cell, egg cell will do meiosis bcs egg cell is a sex cell

Personally I would say the age and appearance of the body. It's of course the first thing you look at, and identifying the victim is one of the most important things to do when beginning an investigation.

Answer: Whether the doors and windows in the room were open or closed.

Explanation:

A first responder is a officer who reaches at the crime scene for the first time and conducts the investigation. Such officer notices the condition of the crime scene, makes notes, documents the crime scene by taking photographs and sketches.  

According to the given situation, Whether the doors and windows in the room were open or closed. is the correct option.

This is because of the fact that this will help him identify whether it was a homicide. As if the old man could have killed himself the doors and windows will be closed. But if the doors and windows were found to be open this indicates that the criminal could have used the doors and windows to escape.

Answer:

Resolution

Explanation:

This phase proceeds organisms. The Sexual Response cycle phases are; excitement, Plateau, Orgasm, Resolution. Resolution is a recovery period after orgasm. In men, it is called the Refractory period and varies in lengths between men. The body returns to normal levels of functioning in this phase.

refractory period

The refractory period is also known as the interval parameter between erectile pauses. This is the nature of most men and is very reasonable. During this period of time, physical orgasm or further ejaculation is not possible. However, some men can learn to have an orgasm without ejaculating, thus making it possible to have multiple orgasms.

During this refractory period, men feel a deep and relaxed sensation, usually felt in the thighs and lower abdomen. Age affects recovery time, where young men recover faster than older men, although this is not universal.  

The cause of relaxation and weakness is factored by the infusion of the hormone oxytocin when ejaculating. Once ejaculation ends, the hormone oxytocin levels increase to prevent erections and even make the penis hypersensitive. For a teenage boy, the refractory period will last from a few minutes to several hours.

Studies show that one of the factors that influence the refractory period is age. With increasing age, men need 12 to 24 hours to be sexually stimulated again.

Factors Affecting the Refractory Period

The refractory period is not something that appears suddenly. There are several factors that influence it.

Among the level of sensitivity in a person, the quality and emotional state during sexual intercourse, alcohol consumption habits, drugs and a sense of comfort in a partner.

refractory period; brainly.com/question/13044654, brainly.com/question/14381815, brainly.com/question/12412207.

Class: High School

Subject: Biology

Keywords: Refractory Period , Sexually, Ejaculation.