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The tympanic membrane closes the inner end of the auditory canal is the correct statement.

Option (c) is correct.

The tympanic membrane, commonly known as the eardrum, is a thin, cone-shaped membrane located at the inner end of the auditory canal. It separates the external ear from the middle ear and forms the boundary between the outer and middle ear. When sound waves enter the ear through the auditory canal, they cause the tympanic membrane to vibrate.

These vibrations are then transmitted to the ossicles (three small bones in the middle ear), which amplify and transmit the sound further into the inner ear. The function of the tympanic membrane is to convert sound energy into mechanical vibrations, allowing sound to be efficiently transmitted from the outer ear to the middle ear.

Therefore, option c, stating that the tympanic membrane closes the inner end of the auditory canal, is the correct statement.

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The statement "They are the only anaerobes on Earth" is not entirely true. While it is true that many Archaea are anaerobes, there are also other groups such as some bacteria and eukaryotes that are capable of living in anaerobic environments.

The statement "None of their genes work like those found in eukaryotes" is also not entirely true. While Archaea do have some unique genetic features, they share many similarities with eukaryotes and some of their genes even have homologs in eukaryotic genomes.

The statement "Most of their genes are similar to those found in bacteria" is partially true. Archaea do share some genetic similarities with bacteria, but they also have many unique genetic features that are not found in bacteria. Finally, the statement "Their cell wall and membrane biochemistry is unique" is true. Archaea have a unique cell wall and membrane composition that is distinct from both bacteria and eukaryotes.

In summary, compared to other groups, Domain Archaea share some similarities with bacteria and eukaryotes but also have unique genetic and biochemical features.

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The correct answer is A. The oxygen molecule accepts electrons from a compound called cytochrome a3. Cytochromes contain a central Iron atom that can either be in the oxidised state(ferric state) Fe3+ or reduced state(ferris state) Fe2+. The cytochrome is oxidized by giving the electron to O2(O2 is reduced).O2 becomes 2O- that quickly react with H+ to form H2O.

Answer: six months apart

Explanation:

sometimes they are off by a day or two

The statement which is not true is it has the capacity to carry two crew members.

The correct option is D.

The Nereus was the underwater vehicle built by the (WHOI).

It was the worlds' deepest diving vehicle.

It was lost one time in deep sea.

Furthermore, it was made to discover the deepest range of the ocean.

Thus, the correct option is D, It is able to dive deeper than any other man-made vehicle.

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Answer:

D

Explanation:

Cytoplasm  is present between the nucleus and the cell membrane.

The plasma membrane seperates the inner environment of a cell from the extracellular fluid. It is composed of a fluid phospholipid bilayer.

Cytoplasm ,the semifluid substance of a cell that is external to  the nuclear membrane and internal to the cellular membrane, sometimes described as the non nuclear content of protoplasm. In eukaryotes ,the cytoplasm contains all of the organelles.

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H2o2 is one! I'm not sure about others.

The correct statement is: "The distance from Earth to the Sun is measured in astronomical units (AU)."

An astronomical unit (AU) is a unit of measurement commonly used in astronomy to represent distances within the solar system.

It is defined as the average distance from the Earth to the Sun, which is approximately 93 million miles or 150 million kilometers. Using AU as a unit allows for a more convenient way to express and compare distances between objects within our solar system.

The statement that the distance from Earth to the Moon and Mars are both measured in light years is incorrect.

A light year is a unit of distance used to measure vast distances in space and is defined as the distance that light travels in one year (approximately 5.88 trillion miles or 9.46 trillion kilometers).

The distances between Earth and the Moon, as well as Earth and Mars, are much smaller and are typically measured in terms of thousands or millions of miles or kilometers.

Similarly, the distance from Earth to the edge of the solar system is not measured in kilometers.

The outermost edge of the solar system is typically defined by heliopause, where the influence of the Sun's solar wind diminishes. This distance is often measured in astronomical units or other astronomical measurements.

The distance from Earth to the star Alpha Centauri, which is the closest star system to our solar system, is not measured in astronomical units (AU).

It is typically measured in terms of light years, as the distance is extremely vast (approximately 4.37 light years away from Earth). Therefore, the correct statement is: "The distance from Earth to the Sun is measured in astronomical units (AU)."

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Answer:

A. 345,6 mL

Explanation:

Tenemos un gas definido en ciertas condiciones (de presión, temperatura y volumen) y queremos saber el volumen que ocupará en condiciones normales de presión y temperatura, es decir, 1 atm y 0ºC.

Para resolver este problema utilizaremos la ecuación de los gases ideales:

pV=nRT

Ya tenemos todos los datos, y sólo nos resta calcular n, el número de moles. R es la constante de los gases, la cual tiene el valor redondeado de 0.082 L.atm/mol.K, por lo cual es importante convertir las unidades para que éstas se cancelen y den como resultado los moles de gas.

Dividimos 560 en 760 para pasar de mmHg a atm, 500 mL se dividen por 1000mL para pasar a litros, y a la temperatura de 18ºC se le suman 273 para pasarla a Kelvin.

Despejamos n de la ecuación:

n=p.V ÷ R.T

n= 0.740 atm × 0.50 L ÷ 0.082 L.atm/mol.K × 291 K

n= 0.0155 mol

Ahora que tenemos el número de moles del gas, podemos usar la ecuación nuevamente para calcular el volumen que tendrá el gas en condiciones normales (1 atm y 0ºC, o 273 K).

Despejamos V de la ecuación:

V= n.R.T ÷ p

V= 0.0155 mol × 0.082 L.atm/mol.K × 273 K ÷ 1 atm

V= 0.346 L ≈ 346 mL

El volumen que ocupará el mismo gas a condiciones normales será 346 mL, por ende la respuesta correcta es la A. Hay una pequeña discrepancia pero ésta es normal, se debe al redondeo del resultado al final (acá redondeo 345.6 a 346).

Answer:

The distribution of natural resources depends upon number of physical factors like terrain, climate and altitude. The distribution of resources is unequal because these factors differ so much over the earth.

The identification of natural resources involves a combination of scientific exploration, remote sensing, and geological surveys. The uneven distribution of natural resources is a result of geological processes, environmental conditions, human activities, etc.

Natural resources are identified through exploration and assessment processes that involve various scientific methods and techniques. Geologists, environmental scientists, and other experts conduct surveys and studies to locate and evaluate potential natural resource deposits. The identification of natural resources is essential for understanding their abundance and distribution, which can significantly impact economic activities, development, and environmental management.

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In investigating gene candidates involved in expression during planarian regeneration, one of the genes that have been identified is the Smed-betacatenin-1 gene. This gene encodes the transcription factor beta-catenin, which is an essential mediator of Wnt signaling in planarians.

The reason why I selected this gene is that previous studies have shown that beta-catenin is a critical regulator of cell proliferation, differentiation, and regeneration in planarians. Beta-catenin is also involved in maintaining the undifferentiated state of neoblasts, which are the stem cells responsible for regeneration in planarians.Tools like Genbank, Pubmed, and Stowers Cutting Class can be used to find forward and reverse primers for candidate genes by searching for the sequence information of the gene of interest. In Genbank, one can enter the name of the gene and select the organism of interest, which in this case is Schmidtea mediterranea.

This will provide the nucleotide sequence information of the gene. Pubmed, on the other hand, can be used to search for articles that describe the gene and its functions. Stowers Cutting Class is an online resource that provides tools for designing primers and other molecular biology techniques. To determine if the Smed-betacatenin-1 gene is being expressed, one can use two types of polymerase chain reaction (PCR): reverse transcription PCR (RT-PCR) and in situ hybridization.

RT-PCR involves converting RNA to cDNA and then amplifying the cDNA using gene-specific primers. In situ hybridization involves labeling a nucleotide probe with a fluorescent or enzymatic tag and then hybridizing it with the RNA of the tissue of interest. The probe can then be visualized under a microscope to determine the expression of the gene. By using these techniques, one can determine whether the Smed-betacatenin-1 gene is being transcribed in the tissue of interest, and therefore, whether it is involved in the process of planarian regeneration.

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Answer:

False

Explanation:

Answer:

Fish
Hope this helps!

Explanation:

Vertebrates have spines / backbones. Octopuses, shrimps, and crabs don't have spines. Fish do.

( Invertebrates have no spines; Octopuses, shrimps, and crabs )

Answer:

the answer is b. thr-pro-ser

The amino acid chain which will be formed by the codons "ACU CCA UCG" will be Threonine-Proline-Serine. Thus, the correct option will be B.

An amino acid can be defined as the fundamental molecule which serves as the building block for protein molecules in the body. There are about twenty different amino acid molecules present inside the body of an organism. A protein molecule consists of one or more chains of amino acid molecules called as polypeptides whose sequence is encoded in a gene.

Different codons are present in the cell which encodes for different amino acids. A codon is a set of three nucleotides which encode amino acid molecules. ACU codon encode for threonine amino acid, CCA encode for Proline amino acid, and UCG encode for Serine amino acid.

Therefore, the correct option will be B.

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The rate of species extinction over the last 50 years has significantly increased compared to rates from the past.

Over the past 50 years, the rate of species extinction has accelerated at an alarming rate compared to historical rates. Human activities, such as habitat destruction, pollution, climate change, and overexploitation, have greatly contributed to this accelerated loss of biodiversity. The impact of these activities on ecosystems and species populations has been profound, leading to a sharp increase in extinction rates.

This current period is often referred to as the "sixth mass extinction" or the "Anthropocene extinction" due to the unprecedented loss of species caused by human influence. It is estimated that the current extinction rate is tens to hundreds of times higher than the background rate observed in the fossil record.

This significant increase in species extinction poses a grave threat to global biodiversity, ecosystem stability, and the services that ecosystems provide to humanity. Efforts to conserve and protect endangered species and their habitats are crucial to mitigate this ongoing crisis.

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The four spores generated following meiosis in a yeast or other Ascomycota, Chlamydomonas or another alga, or a plant are known as the tetrad. Diploids are produced when parent haploids mate. Diploids sporulate and go through meiosis when the conditions are right.

Answer:

oxygen

Explanation:

oxygen gets diffused from the air sacs (aka alveoli) and into the cappilaries.

Explanation:

hope it help you

The drainage pattern one is expected to see in the limestone is trellis. The correct option is C.

Trellis drainage patterns form when sedimentary rocks like limestone are rolled up or slanted and then stripped away to varying degrees depending on their strength.

The Rocky Mountains of British Columbia and Alberta are prime examples of this, with trellis patterns found in many of the drainage systems.

Thus, the correct option is C.

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The missing options of the question are:

Answer: I am pretty sure its Glycolysis

Explanation: i don know but i hope you get it have a good night/day!

Answer:

Skin is one of the largest organs of the body. It is recognized as an organ because it consists of several types of tissues that function together.

Explanation:

got it offline

In the presence of enzymes, glucose joins with other glucose molecules to form glycogen.

An enzyme is a biological catalyst that speeds up chemical reactions in living organisms. The synthesis of glycogen occurs in the liver and skeletal muscles. Glucose is converted to glycogen for storage in the body when the body has an excess amount of glucose that isn't needed for energy production. Glycogen is an essential energy storage molecule in animals that is comparable to starch in plants.

It serves as a fast source of energy because it can quickly be broken down into glucose. When the body needs more glucose, the stored glycogen can be rapidly converted back to glucose and transported to the body's cells for energy production. This is a useful mechanism for animals that frequently experience periods of starvation or need to exert themselves physically. In addition to glycogen synthesis, the body also breaks down glycogen as needed for energy production. Glycogen breakdown is regulated by the hormone glucagon, which is produced by the pancreas.

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True.

The purpose of meiosis is to produce gametes or sex cells. During meiosis, four daughter cells are produced, each of which is haploid (containing half as many chromosomes as the parent cell).

What is Meiosis?

Meiosis contains two distinct cell divisions, which means that one parent cell can produce four gametes (eggs in females, sperm in males). In each round of division, cells go through four stages: prophase, metaphase, anaphase, and telophase.

Before entering meiosis I, a cell must first go through interphase. This is the same interphase that occurs before mitosis. The cell grows, copies its chromosomes, and prepares for division during the G1​​ phase, S phase, and G2 phase of interphase.

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a. The Great Smoky Mountains National Park: Nonexcludable and rivalrous. Free rider problem likely.

b. Luetta Moore Park playground: Nonexcludable. No free rider problem.

c. National defense: Nonexcludable and nonrivalrous. Free rider problem exists.

d. Subway train: Nonexcludable. Free rider problem possible during peak hours.

a. The Great Smoky Mountains National Park: It is nonexcludable because it is difficult to prevent individuals from accessing the park. However, it is rivalrous as the park's resources, such as campsites or parking spaces, can be depleted. Both nonexcludability and rivalry suggest that the park is both nonexcludable and rivalrous. The free rider problem may occur since people can enjoy the benefits of the park without paying for its maintenance or preservation.

b. Playground at Luetta Moore Park: The playground is nonexcludable since it is difficult to prevent people from using it. However, it is nonrival as one person's use does not diminish the usability of the playground for others. Therefore, it is only nonexcludable. The free rider problem may not apply here since the use of the playground does not impose costs on others.

c. National defense: National defense is both nonexcludable and nonrival. It is nonexcludable because it is challenging to exclude individuals from benefiting from defense. It is nonrival because the defense provided to one person does not diminish the defense available to others. Both characteristics make national defense both nonexcludable and nonrival. The free rider problem is prevalent in national defense since individuals can benefit from defense without incurring the costs associated with it.

d. Subway train: A subway train is nonexcludable since it is difficult to prevent individuals from using it. However, it can be rivalrous during peak hours when overcrowding may limit the available space. Therefore, a subway train is only nonexcludable. The free rider problem may not be significant here as long as there are no capacity constraints or overcrowding issues.

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Answer:

Which of the following structures are not involved in asexual reproduction? Gametes.

Explanation:

So option A. Have a great summer. This is the correct answer.

Answer:

The connection is important because the digestive system creates waste that the urinary system excretes.

Explanation: