leptin is secreted by adipose tissue to slow the appetite. despite this, many people continue to gain weight. why does this mechanism not always work?

Uranium is used to determine a rock's age.

The uranium in rocks decays at a steady rate, producing subatomic particles and turning into lead. Scientists estimated the age of the globe at 4.6 billion years by examining the uranium-to-lead ratios in the oldest rocks on the planet. U-235 dating reveals that a rock is 2.84 billion years old.

Why, given that rocks are so old, can the age of rocks be determined using uranium-238?

The age of the rock increases with lead content. Since uranium-238 has a lengthy half-life, only the oldest rocks can be dated. Because so little of the uranium will decay, this method is unreliable for determining the age of rocks that are younger than 10 million years.

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A decrease in blood pH will result in a decrease in the concentration of [tex]H_{2} CO_{3}[/tex]and an increase in the concentration of [tex]HCO_{3} ^{-}[/tex].

The pH of a solution refers to the concentration of the hydrogen ions that is present in the solution. We know that the pH is the negative logarithm of the hydrogen ion concentration of the system.

Now we know that if we try to reduce the pH of the solution, then there would be need to increase the amount of the hydrogen ions in the system and this could be done when the equilibrium position shifts to the left.

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β-lactamase is an enzyme secreted by certain bacteria that cleaves the beta-lactam ring of penicillin and cephalosporin and thus provides for resistance against the antibiotic.

Penicillin is an antibiotic that provides resistance against a large number of bacteria. It was the first antibiotic to be discovered by Alexander Fleming. Like all other antibiotics it may kill the bacteria or suppress its growth. There are different types of penicillin that are used to treat different types of bacterial infections.

Cephalosporin is also an antibiotic used against gram positive and negative bacteria. It was originally developed from a fungus called Acremonium.

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Explanation:

Parenchymal cube-shaped

loosely packed

thin-walled

relatively unspecialized

contain chloroplasts

photosynthesis

cellular respiration

storage

food storage tissues of potatoes

potatoes for sale at a grocery store

Collenchymal elongated

irregularly thickened walls

support

wind resistance

strings running through a stalk of celery

photograph of celery

Sclerenchymal very thick cell walls containing lignin support

strength

tough fibers in jute (used to make rope

An object who’s volume is determined through displacement is called an irregular solid.

An object is said to be irregular if the object can not be measured evenly. There are a lot of irregular objects in our surroundings such as a stone. In this case, we have to obtain the volume of the object by the displacement method.

In this case, the, what we have to do is to use a measuring cylinder to measure a given volume of water. The irregular object is now added and the volume of the water displaced is measured.

The volume of water displaced is the volume of the object.

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The  study of the lake is called limnology which is concerned with both natural and man made lakes their physical characteristics of ecology

The Cycle of Lake Life

Lakes undergo change once they are produced. They experience different life stages, such as youth, adolescence, old age, and death, much like people. All lakes, even the biggest, gradually dry up as their basins fill with dirt and vegetation.

they produce food and water for domestic, industrial, and agricultural use, lakes and ponds are environments of considerable importance to humans. Despite the fact that freshwater ecosystems are fundamentally important to people, they have been badly harmed by a variety of anthropogenic disturbances, which have had a detrimental impact on their structure and function.

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Answer:  1. True

2. CO2

3. Seven years

Explanation:

The mass of particles affect the rate of diffusion; hence a decreased mass particles implies that diffusion rate will be faster.

The mass of particles of substances are important factor in the diffusion processes. Substances or particles which a smaller masses will quickly or faster when diffusion is going on. When the particles are of a bigger mass, the particles will result in a lower diffusion rate

That being said, diffusion is the movement of substances from a region of higher concentration to region of lower concentration. An example of a diffusion process is the movement of gas particles perfume from its container to a room where it is sprayed or released.

So therefore, if the mass of an object is reduced, the diffusion rate will be faster.

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After initiation of CPR and one shock of VF, A second shock is delivered and chest compressions are immediately resumed. An IV was in place. For the next intervention, you should give epinephrine 1 mg IV / IO.

Epinephrine 1 mg is used bluntly during CPR to increase ROSC (Return of spontaneous circulation) rates and survival to hospital discharge. Epinephrine has a more pronounced therapeutic effect when given early in a resuscitation attempt, especially in non-shock cardiac arrest.

Arterial pulse palpation and end-tidal CO2 monitoring are typically used to detect the return of spontaneous circulation (ROSC) during chest compression.

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Answer: Im sorry about before, but the answer is, Both the parents contribute equally to the DNA of next generation during sexual reproduction.

Explanation:

They are interdependent. Wolves get food and multiply, moose decline, followed by a decline in wolves.

The average population size of a species in a given habitat is referred to as carrying capacity. Environmental elements including sufficient food, shelter, water, and mates are able to control the population number of the species. The population will decline until the resource recovers if these needs are not supplied.

Both in nature and in the laboratory, logistic growth is frequently seen but ecologists have found that, contrary to what logistic growth predicts, many population sizes change with time.

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When making a cross comparison between different sets of data, computing the percent change is more accurate.

It is more crucial to use the percentage change method because, as you can see, it provides a more accurate description of how the data has changed over time. This is because you will typically be working with larger datasets and quantities. The mass change as a percentage reveals how much of a substance's mass has changed over time. For instance, if a rock loses one-fourth of its mass over the course of a year, its mass has changed by 25%.

A change that affects the eligibility requirements for the entire caseload or a sizable and discernible portion of the caseload is referred to as a "mass change" and was started by the state or the federal government.

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Energy is transported from lower to higher trophic levels through the food chain or web. However generally only about 10% of the energy in one level is available for the next level.

Used in metabolic processes or released into the environment as heat. This loss of energy explains why there are rarely more than four trophic levels in a food chain or web. With the 10% rule, each trophy level can only give 10% of its energy to the next level. The remaining 90% is used for survival growth, and reproduction and is lost to the environment as heat.

All energy pyramids begin with the transmission of energy from the sun to the first nutrient-level producers. The first, lowest level contains green plants, which are producers. Plants or their products are consumed by second-level organisms that are herbivores or herbivores. At the third level, primary carnivores or carnivores eat herbivores. At the fourth level, secondary carnivores eat primary carnivores.

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Answer:

cells carry out functions that maintain life

living things are made up of one or more cells

Explanation:

The best way to solve the problem of water pollution in the lake while making sure economic and social concerns are considered is building a treatment plant to treat waste before it is released into the lake; option A.

Pollution refers to the presence of harmful unwanted substances in the environment.

There are several forms of pollution:

Water pollution occurs when harmful, substances are introduced into the water by man.

The sources of water pollution include domestic and industrial waste being released into the water. Water pollution makes water unfit for drinking, and swimming, and uninhabitable for aquatic organisms.

Considering the polluted lake near the large city.

The measures for preventing the pollution of the lake include:

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Answer:

the layers of the fruit are like the layers of the earth

Explanation:

Endocytosis by a single-celled organism is most similar to phagocytosis function in a multicellular organism.

Endocytosis and phagocytosis can be considered analogous cellular processes because both involve the engulfment of a cell of particles that are found outside the cell in the surrounding media. Phagocytosis occurs in multicellular organisms such as humans whose macrophages of the immune system are able to phagocyte pathogens in immune responses.

Therefore, we can conclude that phagocytosis in multicellular organisms can be analogous to the cellular process of endocytosis, which occurs both in multicellular and unicellular microorganisms.

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The allele frequency of the W is 90%.

According to the definition of an allele given in the top textbooks about genetics and evolution, an allele is a different arrangement of the same nucleotides in the same location on a long DNA molecule.

"A locus is the  genomic or chromosomal site of a gene or other genetic element, and alleles are different DNA sequences at a locus.

SNPs, or single nucleotide polymorphisms, are the most basic alleles. however they can also involve base pair-sized insertions and deletions, up to thousands of them.

Typical popular definitions of "allele" only include several alleles found inside genes. For instance, the ABO gene, that has six common allele, regulates the ABO blood grouping. Nearly every live person's phenotype again for ABO gene is some mix of simply these in population genetics.

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Complete question:

There are two forms of human earwax: wet and dry. W is a dominant allele that produces wet earwax. In a sample of Swedes, you measure the following genotypes: WW= 810, Ww =180, and ww = 10 What is the allele frequency of W?

Answer:

didn't you already have a answer.

Explanation:

A large percent of people in the population are in Younger than 18 years old.

A population is an identified grouping of objects with the purpose of analysis and data collection. Examples include people and animals. It comprises of a related collection of species that live in a specific area and have the ability to interbreed.

The three primary sources of demographic and socioeconomic statistics are recognized to be administrative records, surveys, and censuses. As part of a comprehensive program for the collection and production of statistical data, these three data sources serve as the main method for gathering fundamental demographic and socioeconomic statistics.

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Due to the fact that reproductive isolation is essential to speciation, it frequently leads to the formation of two distinct species from a single ancestor under various environmental circumstances.

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Answer:

Explanation:

Metabolic acidosis is a disorder that results from an extended exposure to high levels of acid in the body.

It occurs when the body produces too much acid.

It can also occur when the kidneys are not removing enough acid from the body.

The answer to the statement " The relationship between the protists that cause human malaria and humans is an example of commensalism " is false

The simple reason why commensalism does not exist between malarian parasites and humans is because, commensalism is not a biological association where an organism cause diseases or has any detrimental effect on the other other. Rather, in commensalism, on of the organisms benefit from the other, and the other commensal does not benefits or harm the other.

However, the relationship which exist between malarian parasites and humans is parasitism. This is because the protist, feed on nutrients from the the body of the host, humans and cause disease known as malaria.

So therefore, the Plasmodium species are the protists which causes malaria to humans and this association is known as parasitism.

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Claim- The human activity of other nation of improper uses of water and disposal of waste causes negative effects on the other nation.

Evidence- According to the news video, the wastes made a layer on the water surface and floated to the other nation that affected the aquatic organisms. It causes pollution in the water.

Also one study reported that for misusing of water of one nation, the ground water level continuously falling down in other nation.

Reasoning- Based on the evidence, it can be concluded that the improper disposal of wastes and misuse of water changes the environment of other nation. It affects the aquatic organisms and also the human lifestyle.

What is Claim-Evidence-Reasioning?

Claim

A claim is a declaration that responds to a query. Typically, it will consist of just one sentence. Transition words like "because" should not be used because the claim contains no justification, logic, or supporting data.

Evidence

The information utilised to back up the assertion is the proof. Depending on the question and/or lab, it may be either quantitative or qualitative. Even a student-made data table could serve as the basis for the proof. Only facts that directly refute the assertion should be included in the evidence provided by students.

Reasoning

The justification provides the "why" and "how" the evidence substantiates the assertion. A description of the underlying scientific idea that gave rise to the evidence or data should be included.

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Absorption involves the transfer of energy to a substance, while reflection and transmission include direction and speed alterations. They alter waves' amplitude, frequency, speed, direction, or energy in diverse ways.

Many things can happen when waves interact with an item. The term "transmit" refers to the ability of the wave to go through an object. Either the wave is absorbed, in which case thermal energy is produced, or it is reflected.

Definition. The amount of light reflected from a surface or optical component is indicated by its reflectance. When light is projected onto a surface, it is equivalent to the ratio of incident power to reflected power.

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Following a heart attack, lactic acid would accumulate in the tissues due to glycolysis and fermentation, and the production of ATP would decrease. Thus, alternative A and C.

Coronary arteries are blood vessels found on the heart that supply blood rich in oxygen and nutrients to the muscles of the heart. The heart makes use of oxygen, just like any other muscle in the body to break down glucose for energy.

However, if the coronary arteries become narrowed or blocked, the supply of oxygen and other nutrients to the heart is reduced or interrupted. This could happen due to a build-up of cholesterol or plaque in the coronary artery, making it narrow or blocked and leading to a heart attack.

Due to the lack of oxygen, the cells in the heart start to break down glucose using lactic acid fermentation, a type of anaerobic respiration. Since the body cannot further break down lactic acid, it accumulates in the tissues. ATP production also decreases because lactic acid fermentation does not produce as much ATP as aerobic respiration.

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Complete question:

The coronary arteries supply oxygenated blood to heart muscle. Following a heart attack, which of the events would occur in heart tissue due to a block in the coronary arteries? Select all that apply.

A.Lactic acid would accumulate in the tissue due to glycolysis and fermentation.

B.Pyruvate would accumulate.

C. The production of ATP would decrease.

D. Phosphofructokinase, an intermediary enzyme of glycolysis, would be activated.

The answers include the following:

This is referred to as the period in which the earth's atmosphere and the shallow ocean experienced a rise in oxygen content and led to various results.

An example is the extinction of photosynthetic organisms such as anaerobic bacteria and there was also a accumulation of the oxygen content which were present in the atmosphere and water bodies.

The oxygen displaced some gases such as methane which therefore made it more abundant and the main gas which is present in the atmosphere thereby making it the correct choice.

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The luminosity of the constellation crux has been defined as the crux which has been a constellation found in the southern sky that has been centered on the four bright stars just the cross- shaped asterism which is known as the Southern Cross.

The luminosity of the constellation crux has been defined as the crux which has been a constellation found in the southern sky that has been centered on the four bright stars just the cross- shaped asterism which is known as the Southern Cross.The solar system contain total 8 planet in which 146 moon, asteroid and space rocks, a number of dwarf planet such as Pluto and Italian astronomer Galileo galilei discovers solar system.

The solar system has been defined as a system which is gravitationaly bound of the sun and orbit is occupied by object. The formation of solar system takes place 4.6 billion years ago and this happens due to gravitational collapse of a giant molecular cloud. The most and wast majority of the systems mass in the sun and other part of mass contained by the planet Jupiter.

Therefore, The luminosity of the constellation crux has been defined as the crux which has been a constellation found in the southern sky that has been centered on the four bright stars just the cross- shaped asterism which is known as the Southern Cross.

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