El oxígeno es el elemento químico que más hay en la atmósfera ya que es el que necesitamos para respirarVerdadero o Falso

Answer: At about three thousand miles in diameter, Mercury is the smallest planet in the solar system. But its core is massive — it accounts for more than three-quarters of the little planet's diameter, and more than half its mass. ... So even though Mars is bigger than Mercury, it's less dense — a rocky planet with a difference.

Explanation:

Answer:

Each biological parent gives one of their two ABO alleles to their child. For example, a father who has blood type AB has the genotype AB, so he can give either an A or a B allele to a child of his. If the mother has blood type O, her genotype must be OO, and she can only give an O allele to a child.

Type AB blood

Type O blood

Type A blood

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Answer:

in my opion, hygien and care for your teath is more like, brusshing your teeth three times a day if possible and also mouth wash and dont forget to floss if possible

Explanation: My explination for this is teeth are important and needed to be taken care of.

Answer:

Hygiene is a series of practices performed to preserve health.

According to the World Health Organization, "Hygiene refers to conditions and practices that help to maintain health and prevent the spread of diseases." Personal hygiene refers to maintaining the body's cleanliness.

Many people equate hygiene with 'cleanliness,' but hygiene is a broad term. It includes such personal habit choices as how frequently to take a shower or bath, wash hands, trim fingernails, wash clothes, and basically self care. It also includes attention to keeping surfaces in the home and workplace, including bathroom facilities, clean and pathogen-free. Many people know without taking care of your teeth the food would leave many bacteria and without flossing it, it can lead to the food between your teeth to get bad causing a cavity, then tooth decay.

Good luck.

Answer:

hypothalamus

Explanation:

When someone experiences a stressful event, the amygdala, an area of the brain that contributes to emotional processing, sends a distress signal to the hypothalamus.

Adoption studies are a useful tool in studying human characteristics as they allow researchers to examine the relative contributions of genes and environment on an individual's traits.

In adoption studies, researchers compare the characteristics of adopted individuals to those of their biological and adoptive parents. By comparing the similarities and differences in these traits, researchers can determine the extent to which genetics and environment play a role in the development of certain traits.

For example, if a child is adopted at birth and grows up with adoptive parents who have no biological relationship to them, any similarities between the child and their biological parents in terms of personality, intelligence, or physical characteristics can be attributed to genetics. Conversely, any similarities between the child and their adoptive parents can be attributed to the environment provided by the adoptive parents.

By using adoption studies in this way, researchers can gain insights into how genetics and environment interact to shape human characteristics, which can have important implications for fields such as psychology, medicine, and genetics.

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The part of the skin that gives you a unique set of fingerprints is the dermal papillae.

These are the ridges and patterns on the surface of the skin, specifically on your fingertips, that create your distinct set of fingerprints. Just below the hair follicle, there is a collection of mesenchymal cells called the dermal papilla. According to several studies, when hair is growing, the dermal papilla and the hair follicle's stem cells are in close proximity, and the dermal papilla's signalling molecules Wnts, BMPs, noggin, and FGFs trigger the HFSCs to start proliferating. It is thought that the distance between the stem cell compartment and the dermal papilla dampens the signalling, bringing the stem cells back to quiescence, as the follicle expands and pushes the dermal papilla downward.

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Answer:

Natural selection occurs when individuals with certain genotypes are more likely than individuals with other genotypes to survive and reproduce, and thus to pass on their alleles to the next generation.

Explanation:

A change in DNA sequence arising from errors in replication that occur randomly is a mutation.

The enzymes known as DNA polymerases are responsible for arranging the DNA strands in their correct sequence of bases or nucleotides. The correct packaging of DNA molecule is complementary in nature. However, these enzymes often commit mistakes, which may cause DNA alteration and may result into incorrect pairing of nucleotides.

In fact, replication mistakes and DNA damage occur often in the cells of our bodies. However, they typically don't result in cancer or even mutations. That's because DNA repair and editing systems usually recognize and correct them.

Even after the enzyme has proofread the DNA molecule, the incorrect pair of nucleotides may become permanent and may be responsible for mutations.

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The four basic neccessities in emergency period are;

The term emergency refers to any period in which there is scarcity of basic resources such as during war.

In such times there are four basic neccessities that one must think about and they are;

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Answer:

Goodluck. I hope I helped

Explanation:

Oceans support the livelihoods of an estimated 520 million people who rely on fishing and fishing related activities, and 2.6 billion people who depend on fish as an important part of their diet. But Illegal fishing is threatening the food supply of coastal communities as fish populations decline due to overfishing in areas fishers are not permitted to access. Addressing illegal fishing will positively contribute to the equitable growth and empowerment of the people who rely on oceans for food and income.

Answer:First we would need to find the sum of the weights for the 5 bags:

1  1/4 + 1 1/4 + 1  3/4 + 1  3/4 + 2 = 8  pounds total

To divide 8 pounds into 12 bags, divide 8 by 12:

8    =   2     pound per gift bag

12        3

2  pound is equivalent to 0.667 pound  per gift bag

3

A cladogram is a diagram that depicts evolutionary connections between various organisms by showing how they diverged from their common ancestor over time. In this context, interpreting cladograms can help determine which organisms evolved from a common ancestor like Pakicetus. The answer to the question, which organisms evolved from the common ancestor Pakicetus, is whales and hippos.The question asks which organisms evolved from the common ancestor Pakicetus.

Cladograms generally indicate how different groups of organisms are related, based on the similarities and differences between them. Pakicetus is an ancestor of cetaceans, which includes whales and dolphins. Based on the evolutionary relationships shown on a cladogram, we can see that the hippos are the closest living relatives of cetaceans. Therefore, we can infer that whales and hippos evolved from the common ancestor Pakicetus. Hence, the correct answer to the question is "whales and hippos."

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When the resting membrane potential becomes less negative (more positive), that is called depolarization.

What is depolarization?

Depolarization is also known as hypopolarization, also called rising phase. Depolarization is nothing but loss of polarization. More specifically, it is the loss of differences in charge inbetween the inside and outside of a muscle or nerve cells’ plasma membrane. This occurs due to changes in permeability and also migration of Na+ ions to the interior.

The gated sodium (Na+) ion channels present on the neuron's membrane open up suddenly and allow sodium ions (Na+) present outside the membrane in order to rush inside the cell. The internal charge of the nerve changes from -70 mV to -55 mV as the sodium (Na+) ions quickly enter the cell.

So therefore, depolarization is nothing but resting membrane potential becoming less negative (more positive)

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Animals and plants release Carbon dioxide into the air through breathing, while plants take it through photosynthesis, keeping the natural carbon cycle almost in balance. The ocean and atmosphere cycle CO2 together in almost perfect harmony.

Photosynthesis- The practice by which plants convert carbon dioxide, water, and sunlight into oxygen and sugar-based energy is known as photosynthesis.

Solar or radiant energy is converted into chemical energy during photosynthesis. The rate of photosynthesis has a direct impact on the productivity of agricultural crops. It gives the atmosphere the oxygen that all living things need. It maintains this same balanced level of \(O_{2}\) and \(CO_{2}\) ecosystem.

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Answer: A vasectomy is a surgical procedure that cuts or blocks the vas deferens, the two tubes that carry sperm from the testicles to the urethra. The procedure stops sperm from getting into the semen in order to prevent pregnancy.

Explanation:

The most likely result of new US government programs beginning without any budget to pay for O A Citizens in the future will have fewer services or higher taxes.

Result of new US government programs ,Citizens shouldn't be required to pay taxes when they are not fairly represented in Congress because taxation without representation is unjust. According to the Continental Congress, when residents are not fairly represented in Congress, taxation without representation is founded on injustice, and as a result, taxpayers are not obligated to pay taxes. The colonists were drawn to the unity of the United States by this viewpoint of Congress, and they began a revolution against the British Empire.

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Answer:

Explanation:

What did Matthias Jacob Schleiden contribute to the cell theory? Matthias Jacob Schleiden studied microscopic plant structures. In his studies, he observed that the different parts of the plant organism are composed of cells or derivatives of cells.

The brainwave that is probably operating while taking an exam is Beta. Beta brain waves are associated with alertness, concentration, and focus, which are essential when taking an exam.

Delta and Theta waves are associated with deep sleep and relaxation, while Alpha waves are associated with a state of relaxation or meditation. Therefore, the correct option is c. Beta.

While taking an exam, the brain wave that is likely operating is the beta wave. Beta waves are associated with alertness, concentration, and focused mental activity. When you are actively engaged in tasks requiring attention and cognitive processing, such as answering exam questions, your brain produces beta waves. These waves help to keep you attentive and focused, enabling you to analyze information, recall knowledge, and think critically.

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when the forehead senses the presence the nerve pulses will drop and your body will be relaxed. your forehead doesn't have to be fully submerged in the water to cause this response.

Answer:

When the forehead senses the presence of cold water, the body's natural response is to constrict blood vessels in the skin to help conserve heat and maintain body temperature. This process, known as vasoconstriction, causes the skin to feel cold and may also cause goosebumps to form.

The forehead does not necessarily have to be submerged in cold water to cause this response. The body's thermoregulatory system is sensitive to changes in skin temperature and will respond accordingly to help maintain body temperature. Therefore, even if the forehead is only in contact with cold water for a short period of time, the body may still respond with vasoconstriction and other thermoregulatory mechanisms.

Explanation:

The correct sequence of the common pathway of blood clotting from the beginning to the end is as follows:

The mechanism of blood clotting initiates when there is damage to a blood vessel. Platelets immediately begin to stick to the cut edges of the vessel and liberate chemicals in order to attract even more platelets. A platelet plug is formed, and the external bleeding stops.

The mechanism of blood coagulation takes initiated with the injury or when blood is leaked. Whenever there is a rupture of blood vessels or damage is caused to blood, a complex of substances called the prothrombin activator complex is formed.

The activators of prothrombin convert prothrombin into thrombin. Thrombin acts as an enzyme and converts fibrinogen into fibrin threads. These threads have now formed a polymer and activate factors that terminate the entire process.

Therefore, the correct sequence of the common pathway of blood clotting from the beginning to the end is well described above.

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The igneous rock samples demonstrate that they have been through 4 half-lives. The test element has a half-life of 150 million years the rock is approximately 553 million years old.

The age of the rock can be calculated as follows:

Let's say the original quantity of the test element is represented by "X". After the first half-life, the remaining quantity of the test element will be X/2.After the second half-life, the remaining quantity of the test element will be (X/2)/2 = X/4After the third half-life, the remaining quantity of the test element will be (X/4)/2 = X/8

After the fourth half-life, the remaining quantity of the test element will be (X/8)/2 = X/16

Therefore, the amount of the test element remaining after 4 half-lives is X/16. Now we need to use the half-life formula to determine the age of the rock:

t = (n * t1/2) / ln2where t = age of the rock, n = number of half-lives, and t1/2 = half-life of the test element. Plugging in the values we have, we get:t = (4 * 150 million years) / ln2 ≈ 553 million years

Therefore, the rock is approximately 553 million years old.

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The genetics of a small, isolated population of marmota monax groundhogs This population is unique in that it is the result of a unique recessive mutation.

Factors that alter allele frequencies can be deduced from the theorem. The "forces of evolution" are these elements. These four forces exist: natural selection, gene flow, mutation, and genetic drift.

As a result, while allele frequencies will almost certainly change with each generation, sampling error will cause less change as the population grows. The unpredictability of the change's direction may be the most significant aspect. Over time, allele frequencies will fluctuate at random.

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Answer:

If multi-question/answer:

Blood is passed into the nephron and removed through the urethra.

Once waste materials exit the blood, they are removed in the urine.

Some of the materials that exit the blood can be returned to the blood

If one question/answer:

Blood is passed into the nephron and removed through the urethra.

Answer:

C. Some of the materials that exit the blood can be returned to the blood.

Explanation:

Explanation:

What role do producers play in the water cycle? Plants need water to grow and maintain their structure. They absorb groundwater, that is, water collected below ground level due to percolation of rain water, through their root system

Plants need water to grow and maintain their structure. They absorb groundwater, that is, water collected below ground level due to percolation of rainwater, through their root system.

Transpiration is another important part of the water cycle. Transpiration is the process of water vapor being released from plants and soil. Plants release water vapor through microscopic pores called stomata.

There are four main stages in the water cycle. They are evaporation, condensation, precipitation, and collection. Let's look at each of these stages. Evaporation: This is when warmth from the sun causes water from oceans, lakes, streams, ice, and soils to rise into the air and turn into water vapor (gas).

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Answer:

d. Large intestines

Explanation:

Increases in a population's or a dispersed group's membership are referred to as population growth. Around 83 million people, or 1.1% of the world's population, are added every year.

Reason for increase in population:

Maternity rates:

The World Population Prospects research from the UN predicts a reduction in worldwide fertility from 2.5 children per woman in 2019 to 2.2 in 2050.

Extension of longevity:

Recent decades have seen a significant increase in life expectancy, and this trend is expected to continue: in 2050, it is predicted to reach 77.1 years (currently around 73).

Migration from abroad:

Although it has less of an impact than the first two, this component is nonetheless important. In fact, newcomers may have a longer life expectancy in those nations that took in large numbers of refugees or economic migrants (between 2010 and 2020, fourteen countries or regions had a net influx of more than one million).

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The main environmental factors that play inevitable role in seasonal dimorphism are temperature and the length of the day.

Seasonal dimorphism is a process by which a species of organisms change their look and appearance, especially in their size and color following the change in the seasons. The main environmental factors inevitable in this type of dimorphism are temperature and the length of the day. In simple words,  the phenomenon with one species having differently looking images at different times of the year is called seasonal dimorphism.

Summer drought stress and winter cold stress in a specific area are the environmental triggers that stimulate these physical changes.

Seasonal dimorphism is considered from the anatomical viewpoint. Significant differences can be observed between winter and summer leaves obtained from the same individuals.

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Answer:

Lucy

Explanation:

Lucy was found in Hadar, Ethiopia and is estimated to be 3.2 million years old.