Earth's magnetic field is created by the bar magnets reaction forces gravitational forces flow of electric charges

Answer:

Explanation:

Cells start undergoing anaerobic respiration when energy requirement is high and there is not sufficient availability of oxygen to produce required energy .

For example , when we we run fast , energy requirement by muscle cell is high but available oxygen level is not sufficient so cells start anaerobic respiration which produces lactic acid and this product creates tire-ness.

For normal respiration , oxygen is required . If there is lack of oxygen , aerobic respiration is not possible .

In yeast cells , alcohol is produced by anaerobic respiration. Alcohol is not harmful . In muscle cells , lactic acid is produced which is harmful .  

Answer:

The three different views show different level of magnification.

Explanation:

At the first level the structure of plant cell is not clear however upon more magification the view is clarified and the upper epidermis and the lower epidermis are both visible in the third view which is the most magnified. The parts of leaf cell are visible the most evident of them is the epidermis which protects the outside of the cell and also Palisade Mesophyll is visible which helps in photosynthesis.

Answer:

At the first level, the structure of the plant cell is not as clear, but when the image is at 100x, the plant cell is magnified and a lot of detail can be seen. At 400x, which is the most magnified, the details are more and the image is larger, allowing Stella to take note of it. Palisade Mesophyll is part of the cells of the leaves and helps in photosynthesis.

The given question is incomplete as the model is missing from the question, however, the correct model is attached with the answer :

Answer:

The correct answer is -  2 ATP and 2 pyruvic acids.

Explanation:

The given model represents the glycolysis pathway which is the first of the key metabolic step of cellular respiration. It helps in producing the energy in form of ATP through breaking down a glucose molecule into 2 molecules of pyruvic acid and with a series of enzymatic reactions.

This process also releases energy in the form of 2 molecules of ATP and NADH. The pyruvate or pyruvic acid molecules then moves to the link reaction, where acetyl-CoA is produced.

Thus, the correct answer is -  2 ATP and 2 pyruvic acids.

Answer:

2 ATP 2 pyruvic acid

Explanation:

edge 2020

Answer:

These are the answers:

1) Bone marrow is a spongy tissue inside some of our bones.

2) It is located at the ribs, bones of the pelvis and vertebrae,e.t.c.

3) Yes!, A person can live without a bone marrow only if they receive regular blood transfusions.

4) Bone marrow is made up of large bones.

Explanation:

A bone marrow is where new blood cells are produced.

Hope it helps.

Answer:

A. Speciation

Explanation:

Speciation is how a new kind of plant or animal species is created. Speciation occurs when a group within a species separates from other members of its species and develops its own unique characteristics.

When the genetic drift occurs due to various factors and results in the formation of a new species it is called speciation. Thus, option A is correct.

Speciation is the formation of a distinct species from the original population because of the genetic drift that caused evolutionary changes essential for survival.

The species are separated from their original population leading to variation in the gene pool resulting in reproductive isolation and finally, the new species is formed.

Therefore, option A. speciation results in distinct species.

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Areas on the moon called maria consists of basaltic lava. Option B is correct.

The areas on the moon called maria are not actually seas of water, as option a suggests. Instead, they are large, dark, flat areas on the moon's surface. These areas were formed by ancient volcanic activity.

Maria are made up of basaltic lava, which is a type of lava that is low in viscosity and can flow easily. When volcanic eruptions occurred on the moon in the past, this lava flowed out onto the surface and covered large areas, creating the maria.

These volcanic eruptions and the formation of the maria took place billions of years ago, not just a million years ago as option c suggests. They are remnants of the moon's early history when volcanic activity was more prevalent.

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Answer:

The two major causes of the inherited genetic variation are 1-mutations during DNA replication and 2-crossing over during meiosis

Explanation:

The mutations are changes in the genetic information that may be inherited when they occur in germline cells (i.e. sperms and ova). Mutations include single nucleotide polymorphisms (SNPs), insertions and deletions (collectively named indels), and major chromosome arrangements such as, for example, aneuploidy, centric fusion, duplications, etc. On the other hand, the crossing over or recombination is the exchange of genetic material between non-sister chromatids of homologous chromosomes during Prophase I of Meiosis. Recombination is a phenomenon that generates new genetic combinations in the gametes and thus increase genetic diversity. Both germline mutations and crossing over events increase genetic variation in the offspring of the next generation, thereby these phenomena represent sources of inherited variation.

Answer:

B. a concept backed by many well-supported hypotheses

Answer:

Nitrogen and Phosphorus

Explanation:

Nucleic acids and lipids are the major organic molecules that are essential for the survival of the living. Nitrogen is the element that builds nucleic acids and lipids. Thus, option A is correct.

Nucleic acids are defined as biopolymers made of various monomeric units of nucleotides joined together. The nucleotides are composed of phosphate, sugar, and a nitrogenous base. They include RNA and DNA which are important genetic materials of the living. The nucleic acid is made of C, H, O, N and P.

On the other hand, lipids are the macromolecules that are made of fatty acids and glycerol that make them insoluble in water and they include oils and waxes. They are composed of carbon, oxygen, and hydrogen.

Therefore, option A. nitrogen makes the lipids and nucleic acid.

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Answer:

Paracentric Inversion

Explanation:

Some of the mutations that occur in chromosomes involve inversions. These imply a structural change that affect the genes´ order in the chromosome.

In the inversion, the chromosome suffers two ruptures, and then it is reconstituted. The problem is that this reconstitution occurs inverted. These two ruptures might occur in the same chromosomic arm, or it might involve the centromere. The first case is known as paracentric inversion while the second case is called pericentric inversion. Note: The exposed example is a product of paracentric inversion, as the centromere is located between C and D genes, and the inversion involves E, F, and G genes.  

During meiosis, when homologous chromosomes mate, and a structure known as inversion loop is formed. The chiasms within them make a place to inviable gametes. The crossover event inside the loop produces create a bridge between the two homologous chromosomes, and the fragment without centromemer is lost. After that, the bride breaks, and the two homologous chromosomes segregates.  The final result is two viable gametes identical to the ones of the progenitors, and two inviable gametes, result of inversion.        

Answer:

rueda y eje

Explicación:

La rueda y el eje es un tipo de máquina simple que se utiliza para mover las cargas. Consiste en ruedas y un eje que puede levantar cargas pesadas y mover esas cargas de un lugar a otro aplicando menos fuerza. Por lo tanto, la máquina que consta de rueda y eje es la mejor opción para mover una caja de 50 kg desde la planta baja hasta el primer piso que tiene una inclinación de 40 °. Esta caja se puede colocar sobre una máquina simple compuesta de rueda y eje y se puede mover aplicando fuerza desde un lado.

Answer:

A. pseudocoelomate

Explanation:

The body cavity of these animals is filled with fluids. Internal organs are covered by the fluid-filled space. The body cavity serves as the hydrostatic skeleton and has other functions such as digestion of food and waste removal.

Hypothesis: There is a synchrony between the time the bus passes over the hill, the time the cat is positioned on the bench and the time I talk to the cat.

An experiment will be established to prove or deny this hypothesis. This experiment will try to answer if there is a synchrony between the bus, the cat and me.

First, I will write down the time I usually leave the house for the bus stop and then I will look for a schedule of the buses in my city, to evaluate the times when each one passes above the hill to which I refer.

It is necessary that I clock the time spent between my home and the bus stop to which I am going, so that I can relate to the bus schedule.

I must also install a camera system at the bus stop to observe the times the cat arrives at that location.

Every day, for a month, I will write down the time I left home, the time I arrived at the bus stop, the time the cat arrived at the bus stop and the time the bus passed. At the end of this period, I will do average calculations to find out how many times our schedules have been synchronized. Through these data I will conclude whether the hypothesis is false or true.

Answer:

Option C is the correct answer.

Explanation:

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To transfer the gene for Insulin production into the bacteria that will be making it, the scientist should use a Micropipette. The correct option is B.

A micropipette is an electronic lightweight pipette. The topmost part is called the plunger, the bottom is the pipette from where the liquid is transferred. It has a measurement scale to measure.

The transfer of genes for insulin production. The gene transfer can be done accurately with measurement, so a micropipette will be used here.

Thus, option B. Micropipette is correct for the transfer of genes.

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Answer: Children are Especially Vulnerable to X-Ray Damage and Dental X-Rays Every Six Months, and Probably Every Year, May Cause More Harm Than Good

Answer:

Las unidades de Mendel se conocen ahora como GENES

Explanation:

Durante sus experimentos, Mendel demostró que las características de las plantas de guisante (por ejemplo color de la flor, color de la semilla, forma de la semilla, altura de la planta, etcétera) eran heredadas, y denominó "elementos" a las unidades portadoras de dichas características. Es decir que cada elemento o unidad discreta, era el responsable de que la planta exprese una u otra característica. Estableció que estos elementos se redistribuían independientemente uno de otro, generación tras generación. Con el paso del tiempo y el avance de las investigaciones, estas unidades o elementos fueron denominados Genes.      

Answer:

the cell is most likely a plant cell in cytokinesis

Explanation:

Cytokinesis simply means the division of the cytoplasm. It happens after the telophase stage of the cell division and leads to the formation of two distinct cells.

Cytokinesis in animal cells involves the constriction of the plasma membrane from the equator of the cell outward until two distinct cells result. The process starts from the anaphase and continues through the telophase stage of the cell division.

Due to the presence of cell walls in plant cells, cytokinesis does not just involve the constriction of the plasma membrane but the formation of cell plates at the equator of the cell. The cell plate fuses with the plasma membrane, eventually dividing the cell into two with the formation of cell walls between the two membranes of the cell plate.

The cell is most likely a plant cell undergoing cytokinesis.

CYTOKINESIS:

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Answer:

Levels of Organization of Living Things is the hierarchy of complex biological structures arranged from the simplest to complex structures.

Levels of Organization of Living Things of the given biological structures are as follows:

Atoms: Acellular level, that is the smallest unit of all the organisms.

Cells: Cellular level, that is basic and functional unit of all the organissm.

Tissues: Multicellular level, that are a functional group of cells.

Organs: Multicellular level, that are functional group of tissues.

Organ System: Multicellular level, that are functional group of organs.

Organism: Ecological levels and they are basic living system made up of at least one cell.

Answer:

The pyloric sphincter valve

Explanation:

The pyloric sphincter is a thin, circular band of visceral muscle surrounding the pyloric opening at the inferior end of the stomach. It is found at the border of the stomach's final segment , the pylorus, and the small intestine's first segment, duodenum.

Answer:

Meat for food and small size for pets

Explanation:

Artificial selection is the process by which humans control desirable phenotypic characteristics in plants and animals by applying selective breeding techniques to perpetuate these traits in the population. A example of artificial selection includes the process of domestication of modern pigs (Sus domesticus). It has been shown that the modern pigs derived from the wild boar (Sus scrofa), which were domesticated separately 9,000 years ago in China and Western Asia. For example, by artificial selection, humans have domesticated moderns pigs to use them as livestock for direct consumption (i.e., for their meat). Moreover, there are pig populations that have been artificially selected as pets (e.g., miniature Vietnamese Pot-Bellied pigs).

Answer:

similar results in multiple tests of the claim

Explanation:

on some of my study cards

Answer:

B. The patient may have internal bleeding and cuts may not stop bleeding.

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Answer:

Answer:C) The patient may have internal bleeding and cuts may not stop bleeding.

Explanation:

Platelets are cells that form scabs to help stop the bleeding of wounds. When you have low platelets, you can have fewer scabs at a time, so wounds will bleed more. If you have dangerously low platelets, any wound you have will not close and you will not stop bleeding without outside help.

Answer:

Secondary succession occurs when the severity of disturbance is insufficient to remove all the existing vegetation and soil from a site. Many different kinds of disturbances, such as fire, flooding, windstorms, and human activities (e.g., logging of forests) can initiate secondary succession. Pioneers of secondary successions face quite different conditions from those that accompany primary succession. Secondary successions often start with resource-rich conditions associated with high light availability and reduced competition for nutrients and moisture. Disturbances may also be short-lived; for example, gaps created in forest canopies close as the crowns of surrounding trees expand and as seedlings and saplings in the understory grow up in response to increased light. Pioneers rely on recruitment from propagules present in the soil, or that disperse into the site after disturbance occurs. Pioneers are able to outcompete established vegetation that survived the disturbance by maintaining high juvenile growth rates. Some of the fastest growing trees are pioneers in tropical rain forests. Individuals of the balsa tree Ochroma pyramidale, for example, can grow from seedlings to adults with >30 cm trunk diameter in <10 years.

The difference between pioneer and nonpioneer species is difficult to delineate (Table 1). Attempts to define distinct life-history strategies (implying coordinated evolution of life-history traits) are confounded because key traits such as propagule size and juvenile growth rate can vary over several orders of magnitude within a community and show broad overlap among species with contrasting habitat requirements. Nonetheless, interactions among traits can be used to describe some life-history tradeoffs that largely constrain the habitat requirements of pioneers. For vascular plants, paramount among these is a tradeoff between growth in the sun and survival in the shade (Figure 3). The high growth rates of pioneers are maintained by allocating a large fraction of the plant’s resources to new leaf area production, and by investing in nutrient-rich leaf tissue that can attain high-maximum photosynthetic rates. A consequence of preferential allocation to leaf production is that few resources remain that can be used to defend the plant against herbivores and pathogens, or to recover from physical damage. This results in high mortality, particularly in the shade, where resources needed for tissue replacement are most limiting.

Table 1. Characteristics of pioneer tree species in tropical forests that distinguish them from nonpioneer species

Pioneer speciesNonpioneer species1. Juveniles recruit from seed following disturbance; seedlings are unable to survive beneath a forest canopySeedlings and saplings persist in the shade of a forest canopy2. Seeds germinate in response to cues provided by changes in light, temperature, or soil nitrate concentrations indicating disturbance to canopy vegetationSeeds germinate immediately after dispersal or seasonally during periods favorable for establishment3. Seeds generally small; frequently dispersed by windSeeds may be large; frequently dispersed by vertebrates4. Seeds often persist in the soil (weeks to decades after dispersal)Seeds lack dormancy or remain in the soil for less than a year5. High height growth rate and juvenile mortality rateLower height growth, crowns often show lateral spread in the shade6. High maximal photosynthetic rate, light compensation point, and foliar nutrient concentrationsLow maximal photosynthetic rate, light compensation point, and foliar nutrient concentrations7. Short-lived leaves with high leaf area per unit leaf massLeaves of juvenile plants may persist for several years with low leaf area per unit leaf mass8. Open canopies with sparse branchingClosed canopies9. Low wood densityMedium–high wood density10. Low investment in chemical anti-herbivore defenseHigh investment in chemical and structural defenses11. Often form defensive mutualisms with antsDefensive mutualisms uncommon12. Adult lifespan typically &lt;100 yearsAdult lifespan up to 500 years13. Wide geographic and ecological rangeOften restricted geographic range

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Answer:

The correct answer would be - Having reliable access to food and being able to produce more calories per unit of land available led to population increase.

Explanation:

An increase in disease, sedentary agriculture, and increase in environmental degradation are three problem that is associated with the farming.

There are more benefits to continue agriculture is the ability of human kind to produce a food and access to plenty of food consistently which will led to increase the population.

Thus, the correct response would be - Having reliable access to food and being able to produce more calories per unit of land available led to population increase.

Answer:

The endocrine system assists in maintaining and regulating different functions of the body by producing and discharging hormones. It comprises glands situated throughout the body, which produce chemicals known as hormones directly into the blood. The levels of hormones in the blood are monitored by a highly unique homeostatic mechanism known as feedback.  

The two kinds of feedback are common, that is, negative and positive feedback, of this positive feedback, is the rare mechanism. It augments the changes done rather than opposing them. For example, the discharging of oxytocin from the posterior pituitary gland at the time of labor is an illustration of a positive feedback mechanism.  

The stimulation of the muscle contractions, which pushes the baby via the birth canal is done by oxytocin. This discharging of oxytocin leads to an augmented or stronger contraction at the time of labor. This contraction is enhanced and intensify until the baby comes out of the birth canal. However, when the stimulus to the pressure receptor terminates, the generation of oxytocin ceases, which eventually results in the stopping of labor contractions.  

Answer:

positive

Explanation:

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Answer:

Hey there!

3) Well injection is usually done through the vein because they need the substance to go into the blood.

4) Some people believe that the heart is on the left side because its the left ventricle and atrium responsible and when people hear left they think the heart is on the left.

5) People living in high altitudes don't get as much oxygen so their bodies evolved into carrying ,more RBC so more oxygen is carried into their bodies.

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