When cells are dividing it is important to understand that they have to move chromosomes equally to both new cells based on this illustration describe what is a chromosome made of

Answer:

Tilapia is one of the most productive and internationally traded food fish in the world. The production of farmed tilapia is among the fastest expanding food sectors in the world. Nile tilapia ( Oreochromis niloticus) is the most cultured freshwater species among the farmed tilapia and contributes about 71% of the world total tilapia production.

Tilapia is one of the most important farmed fish species worldwide (FAO 2018) and an important source of protein (Fitzsimmons 2000;Hai 2015). Due to its sequenced genome (Conte et al. 2017), easy reproduction, efficiency in adapting to diverse diets, high resistance to diseases and handling practices, and high tolerance of a wide variety of husbandry conditions, it is considered an ideal model in toxicological research.

Explanation:

I hope it helps

Explanation:

Beginning from the outside, they are: the corona - the outermost, hot shell of the atmosphere. the chromosphere - a transparent layer between the corona and the photosphere. the photosphere - the visible "surface" of the Sun.

Explanation:

The chromosphere is above the photosphere, the visible "surface" of the Sun. It lies below the solar corona, the Sun's upper atmosphere, which extends many thousands of kilometers above the chromosphere into space. The plasma (electrically charged gas) in the chromosphere has a very low density

The sugar and phosphate portion of the nucleotides are found "as segments of the rails" on the DNA twisted ladder.

Answer:

reproduction

Explanation:

different traits

The correct options would be B and E.

The population size of each organism in different zones may not vary much due to the following:

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If a person increased the amount of saturated fat in his or her diet, then the person would be more likely to suffer from heart and blood vessel-related disease and obesity as well.

Because saturated fatty acids are completely saturated with hydrogen, they require more energy to break down and generally remain in the solid at room temperature, as well as inside the body, where they can induce heart-related diseases and obesity by blocking blood vessels. For example, butter contains saturated fatty acids, which are generally not recommended in large quantities.

Hence, if a person increased the amount of saturated fat in his or her diet, then the person would be more likely to suffer from heart and blood vessel-related disease and obesity as well..

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Plant cells have plastids and larger vacoule and they also have tough cellulosic cell wall outer to cell membrane as a covering.

Animal cells don't have cell wall rather they have cell membrane as it's outermost covering and they have smaller vacuoles.They also don't have plastids.They have centrosome which is not found in plant cells.

Answer:

cimate change

Answer:

Some bacteria have mutated and are not killed by the penicillin

Explanation:

Prey is a term given to the organism that is eaten by the predators.

Answer:

We can mold metals into different shapes because they are _malleable__.

Explanation:

Malleable (ability to be hammered into thin sheets)

The cluster of polar bears that live along the eastern coast of Russia build a population. The correct option is D.

The group of organisms living in a particular area forms the population of that given area.

As given, a cluster of polar bears that live along the eastern coast of Russia build a population.

Thus, the correct option is D.

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Answer:

D. Tongue rolling

Explanation:

Not many people can do this

D. Tongue rolling

A discontinuous variant refers to such things as eye color or blood group, that have a restricted number of possible values. In other words, someone's blood can be A, B, AB, or O, but it can not be something in between.

Examples of discontinuous variants encompass tongue rolling, fingerprints, eye color, and blood groups. continuous variation fluctuates around an average or a mean of species. Discontinuous variation does not have an average or mean.

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Answer:

A is the answer

Explanation:

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Answer:

Nectar in flowers serves chiefly to attract pollinators, such as fruit-eating bats, hummingbirds, sunbirds, and insects. Nectaries are usually located at the base of the flower stamens, which draw animal visitors into contact with the pollen to be transferred.

Explanation:

The answer is

Amount of sunlight or water.

As growth depends on sunlight and water so it is important to grow a plant in proper sunlight and giving plants regular water is also important.

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Use of bioagent is a good way to eliminate invasive species from an ecosystem.

In my opinion, to eliminate the invasive species from an ecosystem we should find out its bioagent instead of chemical spraying because bioagent does not adversely affected the environment.

The risks of the gene drive getting into another species are not worth gaining biodiversity in an ecosystem because it leads to many consequences and unpredictable effects on ecosystem.

So we can conclude that use of bioagent is a good way to eliminate invasive species from an ecosystem.

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Yes, it is a good way to eliminate invasive species from an ecosystem. This is because invasive species play a critical role in the limitation of biodiversity of a particular ecosystem.

Biodiversity may be defined as the sum total of all the variety of living organisms in a particular ecosystem.

No, the risks of the gene drive getting into another species are not worth gaining biodiversity in an ecosystem. This is because it directs considerable influences and unanticipated impacts on the ecosystem.

Therefore, it is well described above.

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Droughts that are more frequent and severe, storms, heat waves, rising sea levels, melting glaciers, and warming oceans can all hurt animals, ruin their habitats, and disrupt people's livelihoods and societies.

Long-term increases in the earth's average surface temperature, as well as large-scale changes in global, regional, and local weather patterns, are caused by a considerable increase in the levels of greenhouse gases created by the burning of fossil fuels.

Dangerous weather events are growing more common and severe as climate change progresses.

Glacier melting occurs as a result of heat changes, particularly at relatively high temperatures. This is a process in which ice transforms from solid to liquid or water. Scientists have recently detected an alarming rate of glacier melting.

Unusually hot days and multi-day heat waves are a natural component of the weather's day-to-day fluctuations. Hotter-than-usual days and nights are becoming more prevalent as the Earth's temperature warms (see the High and Low Temperatures indicator), and heat waves are anticipated to grow more often and intense.

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This is the complete question.

Cancer is a disease that is caused by genetic mutations. Which health professionals are least likely to face risk factor

in their work that could increase their chances of cancer?

A. Scientists who work with toxic chemicals

B.therapist who operate radiation machine

C.nurses who treat patients with viral infections

D.researches who study DNA replication

Research that study DNA replication. Thus, option "D" is correct.

Cancer directs to any one of a considerable number of diseases described by the growth of anomalous cells that separate uncontrollably and have the ability to enter and destroy ordinary body tissue.

Cancer often has the ability to spread throughout your body. Cancer is the second-main cause of dying in the world.

Thus, option "D" is correct.

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Answer: I would tell them about the water pressure temperatures and the sea life that would live in the sea.:)

Explanation:

Taking into account the definition of kinetic, potencial and mechanical energy, the correct answer is option B: the gravitational potential energy of the system increases from 2 J to 66 J.

Kinetic energy is a form of energy. It is defined as the energy associated with bodies that are in motion and this energy depends on the mass and speed of the body.

Kinetic energy is defined as the amount of work necessary to accelerate a body of a given mass and at rest, until it reaches a given speed. Once this point is reached, the amount of accumulated kinetic energy will remain the same unless there is a change in speed or the body returns to its state of rest by applying a force.

On the other hand, potential energy is the energy that measures the ability of a system to perform work based on its position. In other words, this is the energy that a body has at a certain height above the ground.

Gravitational potential energy is the energy associated with the gravitational force. This will depend on the relative height of an object to some reference point, the mass, and the force of gravity.

Finally, mechanical energy is that which a body or a system obtains as a result of the speed of its movement or its specific position, and which is capable of producing mechanical work. Then:

Potential energy + kinetic energy = total mechanical energy

The principle of conservation of mechanical energy indicates that the mechanical energy of a body remains constant when all the forces acting on it are conservative (a force is conservative when the work it does on a body depends only on the initial and final points and not the path taken to get from one to the other.)

Therefore, if the potential energy decreases, the kinetic energy will increase. In the same way, if the kinetics decreases, the potential energy will increase.

The principle of conservation of mechanical energy can be applied in this case.

A model train running on an inclined track is part of a closed system that has 316 J of mechanical energy.

The kinetic energy of the train is 314 J at the beginning.

Replacing in the definition of mechanical energy:

Potential energy + 314 J = 316 J

and solving you get:

Potential energy = 316 J - 314 J

Potential energy= 2 J

Then, the potential energy of the train is 2 J at the beginning.

The kinetic energy of the train is 250 J at the end.

Replacing in the definition of mechanical energy:

Potential energy + 250 J = 316 J

and solving you get:

Potential energy = 316 J - 250 J

Potential energy= 66 J

Then, the potential energy of the train is 66 J at the end.

Finally, the correct answer is option B: the gravitational potential energy of the system increases from 2 J to 66 J.

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hypothermal vent community.Chemosynthetic symbioses predominate in most deep-sea ecosystems, but they can also infrequently be found at near the surface vents and seeps.

The euphotic zone, which can be found up to 200 metres (656 feet) beneath the surface, is the uppermost portion of a marine ecosystem.Light levels are enough for routine photosynthetic activity at this depth.This area is home to most aquatic life.

An ecosystem known as the intertidal zone can be found on sea shorelines, where a wide variety of creatures can tolerate changes in tide levels.

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1. Short-term hormonal influences on animal behaviour usually occurring late in life  - activational effects

2. A technique that associates a natural response to a stimulus to an unrelated stimulus; also called Pavlovian conditioning  -- classical conditioning

3. The study of animal behaviour in its natural environment  - ethology

4. When an animal learns not to respond to a stimulus  - habituation

5. Finding a solution to a once unsolvable problem  - insightful learning

6. Learning that has taken place but is dormant until a situation requires it  - latent learning

Activational effects are the sudden or immediate temporary transient effects of behavioural changes due to the influence of hormones, especially the gonadal or these hormones. The behaviour change in male animals due to an increase in male se hormonal activity can be referred as an activational effect.

Classical conditioning facilitates learning of a behaviour when a conditioned stimulus is associated with an unconditioned stimulus leading to a conditioned response. Animal training by pairing a new unconditioned stimulus with an already known conditioned stimulus, a new conditioned response of behaviour change can be observed.

Ethology refers to the scientific zoological study (includes both laboratories as well as natural field studies) of animals' behavior with relation to their natural environment. It studies and compares about animal behavioral processes changes under various disciplines like ecology, anatomy, evolution etc.

Habituation is an associative learning process that results when an animal learns to resist a stimulus and not to respond to it after repeated exposure.  

Insightful learning occurs when various parts of a problem are analyzed and their relationship is understood to arrive at the solution suddenly. Animals must look at a situation as a whole, and observe and analyze it to solve the problem. Some animals like chimpanzees can learn through insightful learning

Latent learning occurs without any associated reinforcements. Animals learn new behaviour through latent learning.

Thus, this could be the answer.

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Constructing passageways near the dams to allow to salmon to swim around blocked rivers. Thus, option "D" is correct.

The construction of dams in rivers has blocked the path of  some salmons returning to spawning grounds.

The best way to overcome this is to make the passage ways near the dams to allow salmons to swim in areas which have blocked due to dams. So that salmons can returned to the spawning ground and can spawn which leads to increase in their population.

Thus, option "D" is correct.

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Answer:

Precipitation

Explanation:

Precipitation refers to a process causes dissolved substances to be left behind to form minerals after water in lakes or ponds evaporates.

Answer:

first responders

Explanation:

no need for explaining

Answer:

B.) Can lead to new species that share common ancestors

Explanation:

Genetic drift and natural selection both lead to evolution. This describes the change of a species overtime to be better suited for their environments. In some cases, this leads to the creation of an entirely new species (speciation).