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Correct answer: Mantle

Earth is composed of three layer called as crust, mantle,core. Crust is the outer layer of the earth and mantle is the middle layer and core is known as the inner layer of the earth surface.

Mantle is a layer which found in between the crust and core, it is made up of silicate rocky shell with a thickness of 2886 kilometers. It covers the 84% of the earth's volume.

The mantle layer of earth encompasses core layer of the earth which is made up of iron and nickel which covers 15% of the earth's volume. Mantle layer of the earth trap the heat which is being generated inside the core layer of the earth and act as a insulator.

Earlier in the passage this question was provided for, you should be able to find the fallowing text: "The mantle, being made of rock, acts as a very effective insulator."

Answer: Mantle

The type of bonding responsible is Hydrogen Bonding

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This energy most directly results from the life activity of  respiration.

The hummingbirds have very high energy expenditure (have the highest oxygen requirements of all vertebrae) with a fast heart rate, very fast wing beats and sustained hovering. So the hummingbird is nearly always on the edge of starvation, needing to take in more nectar than its body weight each day.

The respiratory system of these birds is highly adapted for the high oxygen needs. So, the muscles of the hummingbird cause pressure changes within the air sacs. As a result, more oxygen can enter the respiratory system. Also, they have the highest density of red blood cells which allows them to rise heart beat to around 500 breaths per minute during flight.

Answer: Cellular respiration

Explanation:

The process by which the living organism derive energy for the various metabolic processes of the body is known as cellular respiration.

This process allows the body to obtain energy from the food that they eat. Humming bird usually feeds on the nectar of flowers as a source of energy.

The cellular respiration is the process by which this food will be transformed into adenosine triphosphate which is a high energy molecule required for various processes of the body.

The answer is (C) as the name of sugar that makes it up.

DNA stands for Deoxyribose Nucleic Acid. Deoxyribose is a five carbon (pentose)  sugar. Name deoxy is given to it because of containing one oxygen less than ribose. It's formed by replacing the hydroxyl group (OH) with hydrogen (H) at carbon number 2. In DNA structure Deoxyribose  molecule is attached to the next phosphate molecule with the help of phosphodiester bonds.

DNA stands for Deoxyribose Nucleic Acid. Deoxyribose is a five carbon (pentose) sugar. Name deoxy is given to it because of containing one oxygen less than ribose. Thus, the correct option is C.

DNA is  formed by replacing the hydroxyl group (OH) with hydrogen (H) at carbon number 2. In DNA structure Deoxyribose  molecule is attached to the next phosphate molecule with the help of phosphodiester bonds.

DNA  is a hereditary material which is present in human beings as well as all other living organisms.  Every cell which is present in an organism's body has DNA  which is the same. Most of the DNA is situated in the cell's nucleus  and small amount of it can be found in the cell's mitochondria as well.

Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.Thus, the correct option is C.

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Answer: B. Amount of matter produced by the producers should be more than that of the consumers.

Food web defines a interconnection between different food chains and transfer of energy at each trophic level. According to the ten percent law 10% energy is lost from each trophic level. At the first trophic  level there are producers. Producers occupy the only one level in the trophic levels the rest is occupied by consumers this shows the category of consumer is more than producer. Therefore, for successful food web food availability should be more at initial trophic level hence amount of matter produced by the producers should be more than that of the consumer.

Amount of matter produced by the producers should be more than that of the consumers because matter and energy are lost with each successive step of the food chain. Therefore, for a food web to be functional and successful, the total amount matter produced by the producers be more than that of the consumers they support.

A) True

To avoid these hazards, technicians must turn off the engine to stop CNG flow – especially before working on the vehicle. Most CNG vehicles have several ways of turning off the engine, so check the manufacturer's specific directions. Automatic release valve - installed on newer CNG systems.

Answer: True

Explanation:

CNG vehicles present potential hazards which include:

• Ignition sources as the ignition temperature is twice as high as gasoline.

• Contact with fuel

• Asphyxiation

• High-pressure CNG line

To avoid any of these hazards, you must turn off the engine to stop CNG flow and there are many ways by which you can turn it off.  

A. A disease in the population of rabbits. The rabbits dying off would mean that the grass population would increase because there are less rabbits to eat it. The snake and hawk population drop because they are both predators of rabbits, meaning that they eat rabbits. Since the rabbits are dying off, the snakes and hawks have less food source so the limit on how many snakes and hawks that can be sustained by eating the rabbits decreases.

Answer:

2. Creating products that improves people's lives.

5. Remaining impartial about data while conducting experiment.

Explanation:

Scientists are required to perform ethical practices during their tenure of research which does not include any bias, manipulation in observations and the research product can be used for the wellness of the society.

Among the options given, the following are correct options:

2. Creating products that improves people's lives.: The ethical practice of research should aim to provide benefit to the society rather than sceintists obtaining their own benefit.

5. Remaining impartial about data while conducting experiment.: Manipulated and biased observations should not be included in the data used for obtaining and describing the results. It is against the research ethics.

Answer:

The correct answer would be - whisk fern that belongs to the phylum psilophyta.

Explanation:

The whisk fern belongs to the division psilophyta. It is the lower vascular fern or primitive fern. It has vascular tissue or water conducting tissue but they lack true leaves and roots.

The water mineral absorption occurs or initiates in the root like stem called rhizome. Photosynthesis process takes place in the aerial part of the plant. Rhizome receives water from fungus through a mycorrhizal association.

Thus, the correct answer is option C.

Answer:A,B,D,E

Explanation:

The hypothalamus is part of the pituitary gland, regulates temperature and metabolism, links the endocrine and nervous systems and controls homeostatic responses. Thus, the correct option is B.

Pituitary gland is defined as a small, pea sized endocrine gland located at the base of brain below hypothalamus.

It releases several important hormones and controls the function of many other endocrine system glands.

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Polygenic traits are controlled by two or more than two genes (usually by many different genes) at different loci on different chromosomes. These genes are described as polygenes . A polygene refers to a group of genes that when expressed together produce a particular phenotype or trait.

Answer:

letter b

Explanation:

The mouse population increases. Snakes eat mice, so fewer snakes would mean more mice.

b.the mouse population increases  

Answer:

FOR HIGH POWER: CELL MEMBRANE & NUCLEUS

LOW POWER: CELL MEMBRANE

Explanation:

The organelles observable under high power are the cell membrane, nucleus, and ribosomes.

The organelles that were observable under high power are the cell membrane, nucleus, and ribosomes. Vacuoles cannot be observed under high power because they are too small to be seen with a light microscope.

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Animals excrete water by respiration and by passing urine.

Answer:

D. Drink water from plastic bottles.

Explanation:

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This would be because of the melting of icebergs, ice is made of fresh water, that means the water increases in freshness because of the increasing amount of ice melting. It is getting warmer most likely because of global warming, which also contributes to the melting of glaciers

Answer:

This would be because of the melting of icebergs, ice is made of fresh water, that means the water increases in freshness because of the increasing amount of ice melting. It is getting warmer most likely because of global warming, which also contributes to the melting of glaciers

diagram for hydrogen

Answer:

Hydrogen

Explanation:

Bohr Model: In this model negatively charged electrons orbits a positively charged nucleus like the planets orbiting around the sun. Coulomb force between the negatively charged electrons and positively charged nucleus is mathematically akin to the gravitational force of the solar system. Important points are-

Bohr Model of Hydrogen :

The example of hydrogen atom is simplest in case of Bohr model or for a hydrogen-like ion in which the electrons which is negatively charged orbits around a positively charged nucleus. Only certain electron orbits are allowed and radius of the orbit increases square of n, where n is the principal quantum number. The first line of Balmer series is produced in the 3 to 2  transition. For hydrogen, z=1, this produces a photon of wavelength 656 nanometer.

Wells access groundwater, which is part of the water cycle's groundwater storage stage. They must be deep enough to reach the aquifers and are sometimes used with observation wells to monitor aquifer health. Pumping water creates a cone of depression around the well, which allows water to flow towards it.

A well is a structure created to access water from beneath the Earth's surface, tapping into what we call groundwater. The water obtained through wells is part of the water cycle, specifically from the groundwater storage stage. When a well is dug or drilled, it reaches into aquifers, which are the underground layers of water-bearing rock or materials such as gravel, sand, silt, or clay. Groundwater contained in these aquifers is replenished by precipitation that infiltrates the ground, a process known as recharge.

To maintain a reliable water supply and monitor the health of an aquifer, wells may be used in conjunction with observation wells. These are important for observing short-term and long-term changes in water levels, which might indicate the health status of an aquifer. Wells are essential in areas without natural springs, as they provide a means of extracting water that otherwise would remain inaccessible within the geosphere.

While drilling, wells might pass through various aquifers and must be cased to prevent leakage and contamination. Pumping water from the well creates a cone of depression in the water table around the well, which allows water from the surrounding aquifer to flow towards the pump. Excessive pumping, however, can cause nearby wells to run dry or deplete the aquifer, especially during periods of prolonged drought or overuse.

Answer:

groundwater

Explanation:

When precipitation becomes groundwater, wells take the water stored in the ground and utilize it in the well space.

Water is H2o

Covalent compound (O,H are nonmetals)

Valence of O (O must form an octet): 6

Valence of H: 1

Total valence electrons: 8

Molar mass: 18.02 g/mol

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The answer is true.

You can only make one zygote but in some cases the egg splits and makes an identical twin.

Final answer:

A couple can potentially produce over 64 trillion unique zygotes due to the combination of meiotic genetic recombination, random fertilization, and occasional occurrences of twins, both dizygotic and monozygotic.

Explanation:

The number of unique zygotes that a couple can produce is astonishingly high due to the genetic variability involved in sexual reproduction. Each human zygote contains a unique set of 46 chromosomes, with 23 inherited from each parent. This genetic diversity arises from the process of meiosis during gamete formation, where chromosomes are shuffled and recombined. Additionally, random fertilization further increases genetic variability.

While most often a single egg is released and fertilized, resulting in a unique zygote for each pregnancy, there are cases such as dizygotic twins where two eggs are released and fertilized by two different sperm, resulting in two genetically distinct zygotes. Furthermore, unique scenarios can lead to monozygotic twins, where a single zygote divides to form genetically identical offspring. However, when considering the number of potential unique children a couple can produce without considering twins, the estimated number of genetically unique zygotes is over 64 trillion, showcasing the vast potential for genetic diversity.

Its C i did the test im sure

Henrietta Swan Leavitt discovered cepheids in 1908 during the investigation of different stars in the clouds. She published it by working more on it in 1912 and died in December 1921. This discovery was so important in the society in which she lived because the cosmologist of America was known for this discovery of Cepheids which is a relationship between period, luminosity and quivering stars which changes in light.

Functional magnetic resonance imaging (fMRI) is the neuromarketing technique that looks for active areas in the brain by measuring the amount of oxygenated blood flowing through the body.

Functional magnetic resonance imaging (fMRI) is a noninvasive technique for measuring the activities of the brain. This technique is used to observe the brain’s functional anatomy as it reveals the parts of the brain that are involved in a certain mental process. fMRI functions by using magnetic resonance imaging to measure the small changes in blood oxygenation and flow that take place as a result of activities of nerve cells in the active areas of the brain.

A. Populations with high levels of genetic diversity are more likely to have individuals with traits that help them survive if conditions change.

Populations with high levels of genetic diversity are more likely to have individuals with traits that help them survive if conditions change. The correct option is A.

The range of different inherited traits within a species is referred to as genetic diversity.

There probably be various individuals with a wide range of different traits in a species with high genetic diversity. For a population to adapt to changing environments, genetic diversity is essential.

Genetic diversity allows populations to adapt to changing environments. More variation increases the likelihood that some individuals in a population will have allele variations that are suited to the environment.

Those people are more likely to survive and have children with that allele.

Individuals with traits that help them survive if conditions change are more likely to exist in populations with high levels of genetic diversity.

Thus, the correct option is A.

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