HELP A human cell has 46 chromosomes. how many chromosomes does a female egg cell have?

Answer:

D. the dolphin in the back diverge under different selective pressures, which accounts for their difference

Explanation:

I hope this is helps you

Dolphins and bats share a common ancestor that is more recent than the one shared with birds.

Homologous organs are those that may or may not perform the same function, but have the same basic structure and the same embryonic development. This means, therefore, that individuals who have these organs have shared ancestry.

Whit this information, we can conclude that dolphins and bats share a common ancestor that is more recent than the one shared with birds.

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Answer:

cooking.

watering.

washing plates.

washing clothes.

taking a bath.

The pedigree to the right shows how two different traits, the straight thumb (recessive) and the Hitchhiker's Thumb (dominant), are passed on within a family. The shaded shapes represent individuals who have a straight thumb.

Shaded shape is an image that has been partially filled in with a color, pattern, or texture. This method of creating an image is commonly used in artwork, drawings, and other visuals to create a sense of depth and perspective. Shading can also be used to create a variety of effects and textures, allowing for a greater level of detail and realism.

Starting at the top left, the first individual has a Hitchhiker's Thumb. His partner, the second individual, also has a Hitchhiker's Thumb. Their child, the third individual, has a Hitchhiker's Thumb as well.
Moving to the top right, the fourth individual has a Hitchhiker's Thumb. His partner, the fifth individual, has a straight thumb and is shaded. Their child, the sixth individual, has a straight thumb and is shaded.

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The statement "Prokaryotes regulate only during transcription, while eukaryotes can regulate during any stage of protein synthesis" best describe the difference between gene regulation in prokaryotes and eukaryotes.

In simple terms gene regulation is how cells dictate what genes get expressed within them. It is an integral biological process that enables living organisms' correct formation and function by ensuring efficient gene expression control throughout all stages - from transcription to translation.

What is fascinating about this mechanism is its variability across different organisms allowing for unique adaptations among species.

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Answer:

The nervous system guides everyday activities such as waking up; automatic activities such as breathing; and complex processes such as thinking, reading, remembering, and feeling emotions.

Explanation:

The image provided shows a schematic diagram of the lactose operon, which is a system of genes involved in the metabolism of lactose in bacteria.

In the absence of lactose, the repressor protein is active and can bind to the operator region of the DNA, preventing RNA polymerase from transcribing the genes involved in the metabolism of lactose.

Therefore, the best explanation of how the lac operon in E. coli bacteria functions in the absence of lactose is that the repressor protein is active and binds to the operator region of the DNA, preventing RNA polymerase from transcribing the genes involved in the metabolism of lactose. This ensures that the bacteria only produce the necessary enzymes to metabolize lactose when it is present in the environment.

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Salts, metals, and acids are three different types of substances exhibiting unique electrical properties.

Thus, salts are ionic compounds and exhibit electrical properties as they have both positively charged ions and negatively charged ions. They can dissociate in solution into their constituent ions to conduct electricity, but they can not conduct electricity in the solid state.

Like salts, metals also conduct electricity due to their free-moving electrons. They have high electrical conductivity and are used in electrical wiring and other applications. Acids release hydrogen ions when dissolved in water which allows them to conduct electricity because the hydrogen ions move freely and carry an electrical charge when acids are dissolved in water, thereby, exhibiting electrical properties.

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Answer: DIGESTION

Explanation:the breaking down of nutrients is know as digestion.DIGESTION is the process of mechanically breaking down food into substances for absorption into the bloodstream. Hope this helps!

Embryonated chicken eggs represents an in vivo method for cultivating viruses. (option c)

To cultivate viruses in a living system, an in vivo method is used. Among the options provided, embryonated chicken eggs are the most commonly used method for culturing viruses in a living organism.

HeLa cells: HeLa cells (a) are human cancer cells commonly used in laboratory research, but they are not a living organism suitable for virus cultivation.

Pure bacterial cell cultures: Bacterial cell cultures (b) are often used to study bacteriophages, which are viruses that infect bacteria. However, this method involves culturing viruses in bacterial hosts and does not involve a living organism.

Embryonated chicken eggs: Embryonated chicken eggs (c) are a widely used method for virus cultivation. In this method, viruses are injected into the developing embryo, which provides an environment for viral replication. The embryos provide a controlled and nutrient-rich environment for the viruses to grow and propagate.

Lung cell culture: Lung cell culture (d) involves growing lung cells in a laboratory setting. While this method can be used to study certain viruses, it is an in vitro (outside a living organism) method rather than an in vivo method.

In conclusion, the in vivo method for cultivating viruses among the options provided is embryonated chicken eggs. This method provides a living system in which viruses can replicate and propagate. (option c)

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A person can use an eraser, whiteout, or a computer program to erase parts of a document.

Computer is an advanced electronic device that takes data as input, processes it according to a set of instructions and produces the desired output. It is used to perform various tasks such as calculations, data processing, and automated reasoning. Computers have become an integral part of our daily life and have helped us in many ways. They have enabled us to store and access data quickly, communicate with people around the world, and make calculations faster and more accurate. Computers are also used for entertainment such as gaming, videos and music. In addition, computers are used in many industries such as medical, business, engineering, and security.

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Explanation:

Answer:

the enzyme get denatured since the optimum temperature has been exceeded therefore enzyme function slows

Viruses have structures that allow them to inject their genetic material directly into the DNA of the host cell, which is a strategy benefits the virus in that the virus may use the host's molecular machinery to replicate itself.

Viruses are biological entities (not organisms) that cannot reproduce in the absence of a suitable host, which is required to provide the molecular machinery for replication.

In conclusion, Viruses have structures that allow them to inject their genetic material directly into the DNA of the host cell, which is a strategy benefits the virus in that the virus may use the host's molecular machinery to replicate itself.

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Answer:

that a object at rest will stay at rest until  pushed or pulled

Explanation:

European Model

American Model

The American model is a global weather prediction system developed by the National Oceanic and Atmospheric Administration (NOAA). It is composed of four separate models: the atmosphere, ocean, land/soil, and sea ice. The ensemble cast consists of 51 separate forecasts, which are then combined to produce a single forecast.

The European model is a global weather prediction system developed by the European Centre for Medium-Range Weather Forecasts (ECMWF). It is composed of three separate models: the atmosphere, ocean, and land/soil. The ensemble forecast consists of 21 separate forecasts, which are then combined to produce a single forecast.

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Answer:

It's because an organism's phenotype, or physical traits, are what truly decide whether it can reproduce and pass on its genotype to the following generation.

Because the phenotype of an organism represents the alleles that are actually expressed in that organism, natural selection affects that phenotype.

Explanation:

Answer:

false I geuss

Explanation:

Student–teacher ratio or student–faculty ratio is the number of students who attend a school or university divided by the number of teachers in the institution. For example, a student–teacher ratio of 10:1 indicates that there are 10 students for every one teacher.

The introduction of the spiny water flea into the lake is likely to have a negative effect on the balance of the native ecosystem, as the water fleas will compete with native fish for resources such as zooplankton, and may disrupt the existing food chain.

A water flea is an aquatic crustacean. Normally, it is a member of the order Cladocera, meaning it has a small body, two antennae, and a single shell (a carapace) over its back. Water fleas move by using the hair-like setae which are located on their legs. They are an important part of aquatic ecosystems as they are used as food by other aquatic organisms. They also help to clean up organic matter in water bodies, thus improving water quality.

A zooplankton is a microscopic or tiny aquatic animal, usually found in oceans or freshwater bodies. They are usually very small in size and typically feed on phytoplankton. Zooplankton are key components of aquatic food webs and are a vital part of the aquatic environment. They are also important for carbon cycling, filtering pollutant particles from the water, providing food for fish and other aquatic organisms, and providing a food source for larger predators.

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Answer:

The reactions of cellular respiration can be grouped into three stages: glycolysis, the Krebs cycle (also called the citric acid cycle), and electron transport.

Explanation:

;)

Answer:

Because each subject in an experiment has to have equal conditions to ensure the most accurate results. And water temperature is known to impact plant growth. An experiment using different water temperatures is a terribly inaccurate experiment.

The two pieces of evidence that support the theory of the expanding universe are the red shift of light from distant stars and the existence of cosmic background radiation.

The correct answer is option B.

1. Red shift of light from distant stars: The observation of redshift in the light coming from distant galaxies provides evidence for the expansion of the universe. Redshift occurs when the light waves from an object moving away from an observer are stretched, causing a shift towards longer wavelengths. This phenomenon is consistent with the Doppler effect, where the wavelength of light appears to stretch as the source moves away. The redshift of light from distant stars indicates that galaxies are moving away from us and from each other, supporting the idea that the universe is expanding.

2. Existence of cosmic background radiation: The discovery of cosmic background radiation further supports the theory of the expanding universe. Cosmic background radiation is a faint, uniform microwave radiation that permeates the entire universe. It is believed to be residual radiation from the Big Bang, the initial event that is thought to have initiated the expansion of the universe. The presence of cosmic background radiation provides strong evidence for the hot, dense early stages of the universe and its subsequent expansion.

Based on the information provided in the diagram, it is not possible to determine the identity or nature of the celestial objects labeled X. The diagram only represents the expansion of the universe over time and does not provide specific details about individual celestial objects.

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Explanation:

The amount of charge that flows through a circuit is given by the product of the current and the time, Q = I*t. Therefore, we can find the current by dividing the charge by the time:

I = Q/t

In this case, the charge is 300 Coulombs and the time is 3.5 minutes (which we will convert to seconds for convenience):

Q = 300 C

t = 3.5 min = 3.5 * 60 s = 210 s

Substituting these values into the equation above, we get:

I = Q/t = 300 C / 210 s = 1.43 A

Therefore, the current flowing through the toaster is 1.43 Amperes.

Answer:Nerve Cells Do Not Renew Themselves

Explanation:

After an injury, the skin makes a bunch of new cells and uses them to heal your wound. Yet, nerve cells in your brain, also called neurons, do not renew themselves. They do not divide at all

One interesting aspect of the article is the discussion around using CRISPR to edit disease-causing mutations after birth, rather than in embryos.

Fyodor Urnov supports this approach and believes that there is no circumstance that would justify modifying babies genetically. This raises the question of whether there is a moral or ethical line that should not be crossed when it comes to genetic modification of humans, even if it is done to prevent or treat disease.

Another interesting point is the potential use of CRISPR to edit the DNA of egg or sperm precursor cells to avoid some of the hurdles of editing embryos. This raises the question of how this approach would be implemented and regulated, as it involves altering the genetic material of potential future offspring before they are even conceived.

Overall, the article highlights the ongoing debate and ethical considerations around the use of CRISPR for genetic modification in humans, as well as the need for continued research and oversight to ensure that any such use is safe and ethical.

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There are 6.25% homozygous dominant people (AA), 37.5% heterozygous people (Aa), and 56.25% homozygous recessive people (aa).

In a population with two alleles, p and q, the frequency of p and q must add up to 1, or 100%. In this case, p = 0.25 and q = 0.75.

Using the Hardy-Weinberg equation, we can calculate the expected frequencies of the three possible genotypes: AA, Aa, and aa. The equation is:

p² + 2pq + q² = 1

where p² represents the frequency of the AA genotype, 2pq represents the frequency of the Aa genotype, and q² represents the frequency of the aa genotype.

Substituting the given values of p and q:

(0.25)² + 2(0.25)(0.75) + (0.75)² = 1

0.0625 + 0.375 + 0.5625 = 1

Therefore, the expected frequencies of the three genotypes are:

AA = p² = (0.25)² = 0.0625

Aa = 2pq = 2(0.25)(0.75) = 0.375

aa = q² = (0.75)² = 0.5625

So in this population, we would expect to see 6.25% homozygous dominant individuals (AA), 37.5% heterozygous individuals (Aa), and 56.25% homozygous recessive individuals (aa).

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you can't see the colour of organisms

you don't have the ability to analize living organisms

artefacts can be easily produced

The order of the molecules from lowest to highest ability to pass through a phospholipid bilayer is: molecular oxygen, water, a sodium ion, glucose.

The ability of molecules to pass through a phospholipid bilayer depends on their size, polarity, and charge. Here's the order from lowest to highest ability to pass through a phospholipid bilayer:

1. Molecular oxygen (O2) - small and nonpolar, can easily pass through.
2. Water (H2O) - small and polar, can pass through but slower than molecular oxygen.
3. A sodium ion (Na+) - small but charged, has difficulty passing through without help from channels or transporters.
4. Glucose - large and polar, has the lowest ability to pass through without help from specific transport proteins.

So, the correct order is: molecular oxygen, water, a sodium ion, glucose.

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Answer:

1) Weathering, Erosion, Disposition

2) Physical weathering is the breakdown of large rocks into fragments by physical forces; the chemical composition of the rock is not changed. Chemical weathering is the breakdown of rock by chemical reactions; the chemical composition is changed.

3) The four forces of erosion are water, wind, gravity, and glaciers.

4) Because the velocity of the river slows down a great deal when it reaches the large body of water, the sediment that the river was carrying is deposited along the mouth of the large body of water.

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Abrasion: Abrasion is the breaking down and wearing away of rock material by the mechanical action of another rock. Three agents of physical weathering that cause abrasion are moving water, wind, and gravity. Also, rocks suspended in thence of a glacier can cause abrasion of other rocks on Earth's surface. This would be a prime example of physical weathering, or mechanical weathering.

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Acid Precipitation: Acid rain causes less erosion than normal rainwater does. Rainwater can break down rocks by dissolving minerals in the rocks. Acid rain is rainwater that is more acidic than normal rainwater. Acid rain can also dissolve the minerals in rocks faster than normal rainwater can. This is chemical weathering.

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Animal actions: Animal and plant mobility is a factor in biological weathering. For instance, a plant may grow in a gap in a rock and, as its roots spread, cause the fracture to expand. A rabbit may also burrow into a crack in a rock, making it wider and eventually separating the rock. This is an example of physical weathering.

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Ice wedging: Ice wedging ,sometimes known as frost wedging ,can also cause rocks to break apart. Ice wedging causes cracks in rocks to expand as water seeps in and the water freezes and expands opening the crack further. Rocks formed under pressure deep within earth can become exposed at the surface. This is physical weathering

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Oxidation: Oxidation is another kind of chemical weathering. It occurs when oxygen from air dissolves in water and combines with chemicals in the rocks to form oxides. if the rock contains a lot of iron, then oxidation produces a brown material called iron oxide. This looks like rust on the rock.

Weathering is the chemical and mechanical breakdown of exposed rock. The chemical changes alter the minerals and make them softer, and mechanical weathering physically breaks rock into smaller and smaller pieces.

Erosion is the REMOVAL of those chemically and mechanically softer and broken pieces of rock from their original locations, by gravity, water, ice or wind. Erosion is transport (and as a result, fresh unaltered rock is exposed to wind, water and weather, and THAT becomes weathered in turn). The material being transported is ‘sediment’: sand, silt, mud and gravel.

Deposition is when the weathered and eroded (transported) material is dropped and settles down elsewhere, forming a ‘deposit’ of transported rock material.

If this deposit remains undisturbed long enough, and is buried by enough arriving material, it will eventually go through compaction and chemical reactions forming cement between the grains - thus resulting in a brand new, sedimentary rock.

Weathering, erosion, transport, deposition, compaction and cementation are part of the ‘rock cycle’.

Let’s start with basalt that form at mid ocean spreading centers. At mid ocean spreading centers rock material from the earth’s mantle continuously melts due to continuous decreasing in pressure from the oceanic crust spreading at this point. The molten rock quickly cools at the earth’s surface and forms rock known as basalt that makes up the oceanic crust all over the world. The newly produced oceanic crust rock slowly moves towards a boundary with a continental crust where the oceanic crust subducts beneath the continental crust due to the oceanic crust having a higher density than the continental crust. This is where things get a bit more interesting.

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