When transplanted, the dorsal lip of the blastopore—the region destined to give rise to the dorsal mesoderm—not only did not alter fate, but also caused the host cells around it to do so.
Hans Spemann and his graduate student Hilde Mangold carried out the crucial experiments in 1924. They discovered that when transplanted to an ectopic host site, one area of the late blastula and early gastrula functioned in an exceptional manner. When transplanted, the dorsal lip of the blastopore—the region destined to give rise to the dorsal mesoderm—not only did not alter fate, but also caused the host cells around it to do so. The dorsal lip transplant dramatically altered the fate of the embryo, inducing a brand-new developmental axis. Because of its distinctive inductive properties, the dorsal lip of the blastopore was given the moniker "organizer".
Therefore, Cells in another area of the amphibian embryo are induced by the dorsal lip of the blastopore to modify their course of development.
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Why is it important that the AV node delay the electrical impulse moving from the SA node and the atria to the ventricles?
Impulses are delayed by the atrioventricular node by roughly 0.09 seconds.
This delay in the cardiac pulse is crucial because it guarantees that the blood from the atria has been discharged into the ventricles before the ventricles contract.
Why is the time interval between the impulses from the AV and SA nodes significant?Due to its proximity to the SA node, the right atrium depolarizes earlier than the left, causing it to pump blood before the left atrium. The impulse is postponed at the AV node to enable time for the ventricles to fill with blood.
A group of cells called the AV node functions as a gate to delay the electrical signal before it enters the ventricles in the middle of the heart between the atria and ventricles. Because of this delay, the atria can contract before the ventricles do
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If the atomic mass of an element is 12 what is the number of protons/electrons in that specific element?
Explanation:
Atomic mass = Mass of protons + Mass of neutrons + Mass of electrons so you can calculate it
indicate whether natural selection, if it acted alone, could cause changes in the allele frequency of a population. acting alone could change allele frequency. acting alone could not change allele frequency.
Acting alone could change allele frequency.
Herbal choice can motivate microevolution or a change-in allele frequencies over time with fitness-growing alleles becoming greater not unusual in the populace over generations. fitness is a measure of relative reproductive success. herbal preference occurs at the same time as there are variations in fitness amongst individuals of a population.
As a end result, some people pass more genes to the frequency subsequent generation. This causes allele frequency to change. herbal choice takes area whilst one allele or mixture of alleles of numerous genes makes an organism extra or plenty much less desirable, that is capable of live on and reproduce in a given surroundings. If an allele reduces fitness, its frequency will have a propensity to drop from one era to the subsequent. therefore we'd expect a preference towards the dominant phenotype to adjust the frequencies of alleles greater unexpectedly.
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How did Hutton's and Lyell's ideas influence Darwin's thinking about evolution?
Hutton and Lyell influenced Darwin's thinking about evolution because they proposed a gradual process to understand the real world.
What were Hutton's and Lyell's ideas?James Hutton’s and Charles Lyell’s ideas were based on the gradual mechanisms that shape geological features in the environment, which is fundamental to understanding the evolution (change) of species.
In the same line, Darwin believed that evolution was a slow mechanism associated with differential survival and reproduction of the fittest (better adapted) organisms that live in a particular environment, a process known as natural selection and proposed by Darwin to explain this thinking.
In conclusion, Hutton's and Lyell's ideas influence Darwin's thinking about evolution because they proposed a gradual process to understand the real world (in the first case in order to understand geological processes).
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Why does altitude have almost no effect on an animal's ability to rid itself of CO₂ through gas exchange?
The partial pressure differential of CO₂ between the respiratory surface and the environment always greatly favors the release of CO₂ to the atmosphere since CO₂ makes up such a small portion of the atmospheric gas.
At high altitudes, everyone hyperventilates (breathes more rapidly and deeply than usual), which is vital for survival. Breathing more quickly effectively increases the passage of fresh air past the blood, which is the purpose of the lungs: to expose blood to fresh air. This indicates that anytime the blood removes an oxygen molecule, a new one is immediately added in its place. As a result, there is always more oxygen accessible for the blood to absorb. The body continuously produces carbon dioxide (CO2), which the lungs remove by allowing it to permeate into the outside air. By hyperventilating, one can increase the amount of fresh air passing through one's lungs, hence speeding up the rate of CO2 loss. Since CO2 is an acidic gas, the more of it that is removed from the blood, the more alkaline the blood becomes. The kidneys adjust the blood's alkalinity at elevations up to roughly 6000 meters over the course of a few days by eliminating alkali (in the form of bicarbonate ions, HCO3-).
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Draw the ketose and aldose forms of a monosaccharide with the chemical formula c3h6o3. how is the structure of the monosaccharide changed from one form to the other in the human body?
Monosaccharides are the simplest structures of carbohydrates and have the structure of an aldehyde or ketone that has at least two hydroxy groups, sugars that have an aldehyde carbonyl are called aldoses, and those that have a ketone function are called ketoses.
How is the structure of monosaccharide changed from one form to another in the human body?The bond between monosaccharides is called a glycosidic bond. In it, two monosaccharides are linked through the combination of two hydroxyl groups present in their distinct structures.
With this information, we can conclude that Monosaccharides are the simplest carbohydrate compounds, having between three and seven carbons. They are monomers, that is, they cannot be hydrolyzed. They usually have a sweet taste and are always soluble in water. The most popularly known are the pentoses and hexoses.
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Keeping a clear focus on the activity you are engaged in, with attention to as many of the specifics of the event as you can, is a perception skill known as what?
Keeping a clear focus on the activity you are engaged in, with attention to as many of the specifics of the event as you can, is a perception skill known as mindfulness
When someone is so focused on activities around him, such that he is very care careful and sensitive to the event in his environment simply is an act of mindfulness.
Keeping a clear focus on the activity you are engaged in, with attention to as many of the specifics of the event as you can, is a perception skill known as mindfulness
Who are mindful individuals?Mindful individuals are individuals that are just, sincere and cautious in every aspect of theirs lives.
It is not surprising to see that people who are mindful of activities they engage in find it difficult to keep bad companies as these individuals try as much as possible to beware of consequences of whatever they indulged themselves in.
Please get me better that mindful individuals are very optimistic people and are characteristized by having traits such as
Patience: They are usually very calm and patient at all things Carefulness: They do things with utmost carefulness Loyal: They are very lovely and loyal friends Discipline: They are disciplined individualsSo therefore, keeping a clear focus on the activity you are engaged in, with attention to as many of the specifics of the event as you can, is a perception skill known as mindfulness
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Which of these objects best models the structure of a fat molecule?
A. An interlocked pair of rings
OB. A key ring with three keys
OC. A spiral staircase
D. A strand of beads of multiple colors
The objects which best models the structure of a fat molecule is that of a key ring with three keys and is therefore denoted as option B.
What is Fat?This is described as a major storage of energy in the body system of individuals which is usually stored as adipose tissues under the skin and comprises of three molecules joined together which are referred to as triglycerides.
The fat molecule comprises of a glycerol backbone and three fatty acid tails and is therefore denoted as a key ring with three keys which is therefore the reason why option B was chosen as the most appropriate choice.
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Based on your understanding of biological macromolecules, the number of unique monomer molecules that is common to living organisms is closest to which number?.
Based on the understanding of biological macromolecules, the number of unique monomer molecules that is common to live organisms is close to <100.
Macromolecules are comprised of various monomers that are found in living organisms. The unique monomers common to living organisms are around 100 molecules. The four main macromolecules are nucleic acids, proteins, carbohydrates, and lipids. They carry out crucial tasks including supporting the structure, serving as a reservoir for stored energy, storing and retrieving genetic data, and accelerating metabolic operations.
Macromolecules are enormous molecules that fill a cell and give it vital life-sustaining activities. Macromolecules, for instance, offer structural support, serve as a reservoir for stored energy, can store and retrieve genetic information, and can speed up biological operations. The nutrients the body requires to survive are provided by food.
Biological macromolecules, or big molecules, are present in many of these essential nutrients and are required for life. These polymers (macromolecules) are constructed from various combinations of smaller organic molecules (monomers).
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some bacteria live in deep sea vents where no light penetrates, yet are still capable of producing their own reduced carbon. these organisms are classified as choose one: a. photoheterotrophs. b. chemoheterotrophs. c. chemoautotrophs. d. photoautotrophs.
The bacteria that live in deep sea vents where no light penetrates, yet are still capable of producing their own reduced carbon are classified as chemoautotrophs.
What is chemoautotrophs?Chemoautotrophs are the class of organisms that use inorganic chemical reactions as the source of energy to produce organic compounds by using carbon dioxide. They will not use light energy, as they live in deep sea vents or other regions where light generally does not reach instead they use the energy obtained from the oxidation of the inorganic compounds to convert carbon dioxide into the necessary organic compounds.As the other options can be described in short as,
Photoautotrophs are the class of organisms that cannot live in areas where light does not penetrate as they require light for energy production by photosynthesis.
Photoheterotrophs and chemoheterotrophs cannot synthesize their own products and are dependent on other plants and organisms to meet their energy and nutrition requirements.
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question 1(multiple choice worth 2 points) (04.03 lc) cellular respiration occurs within the of a cell. nucleus vacuoles cytoplasm mitochondrion
Mitochondria, is responsible for cellular respiration.
Mitochondria- The majority of the chemical energy required to drive a cell's metabolic operations is produced by mitochondria, which are membrane-bound cell organelles. Adenosine triphosphate, a tiny molecule, serves as a storage container for the chemical energy generated by the mitochondria (ATP).
ATP- A crucial "energy molecule" present in all living things is ATP. In particular, it's a coenzyme that transfers energy to the cells by liberating its phosphate groups when it interacts with enzymes like ATP triphosphatase.
Enzyme- Proteins called enzymes aid in accelerating our bodies' chemical processes, or metabolism. Some compounds are created, while others are broken down.
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Tobacco leaves contain nicotine, a poisonous compound that is energetically expensive for the plant to make. What advantage might the plant gain by using some of its resources to produce nicotine?
Nicotine protects the plant from herbivores. Detritivores are clients that acquire their power from detritus.
Tobacco leaves incorporate nicotine, a poisonous compound that is energetically pricey for the plan to make what benefits through the plant gain by using some of its resources to produce nicotine. nicely, the important thing right here is that nicotine is toxic to insects, in reality, is an insecticide, so while an insect begins chewing at the plant, nicotine is launched and the bugs fly away. So this preserves the amount of uh, plant material this is ultimate. And although it took a bit bit of power to make the nicotine is some distance much less electricity than rebuilding a whole leaf.
The energy flows through the manufacturers to the pinnacle consumer and gets transferred to the nutrient cycle. accordingly, the strength flow takes place in exceptional forms and is now not in a systemic cycle; subsequently, the time period energy float is used as opposed to the electricity cycle.
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Researchers found that a camel in the sun required much more water when its fur was shaved off, although its body temperature was the same. What can you conclude about the relationship between osmoregulation and the insulation provided by fur?
The light color of camel's fur helps to reflect light energy reducing heat transfer to its skin by radiation .
What adaptation do camels have?The way that camels have adapted to living in the desert is widely documented . They are sheilded from wind borne dust and sand by their large eyelashes and extended noses . Camels can go for extended periods without water and can go for extended times without food thanks to the energy dense fat this stored in their humps.
Camels have sweat glands distributed throughout their skin, from which water removes body heat heat through evaporation much as in human. That's why camel's have thick fur , if the fur were shaved so they require more water.
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name the structure that is a microtubule organizing center and is also responsible for directing the formation of the mitotic spindle?
Both the mitotic spindle machinery and the shape of the cell are governed by the centrosome. The centrosome in eukaryotic cells starts the polymerization of microtubules.
What is the function of centrosome?The centrosome, which produces a radial arrangement of microtubules ideal for the division of genetic material between daughter cells, is frequently referred to as “the primary microtubule-organizing core of the cell.”
A centrosome is a cellular component that aids in cell division. The centrosome replicates before to cell division, and when division starts, the two centrosomes migrate to the opposing ends of the cell.
Therefore, centrosome the structure that is a microtubule organizing center and is also responsible for directing the formation of the mitotic spindle.
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new and emerging viruses come from choose one: a. multiple viruses fusing. b. ""jumping"" hosts. c. cancer cells. d. bacterial degeneration.
Jumping hosts viruses have the ability to "jump" hosts if they recombine in novel ways while infecting the host.
The correct option is B.
What exactly is an infection?When germs enter the body, flourish, and trigger a response in the body, an infection results.. An infection must have three components in order to manifest: a source (such as a sink, surface, or human skin), a susceptible person, and an entry point for the germs to enter the body.
What are the four different forms of infections?The four basic categories of infectious agents are bacteria, viruses, fungi, and parasites. Researchers separate these agents for study using specific characteristics, such as the infectious agent's size.
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A male stickleback fish attacks other males that invade its nesting territory (see Figure 51.2a ). Predict the likely pattern of dispersion for male sticklebacks, and explain your reasoning.
Male sticklebacks are thought to disperse uniformly, with antagonistic encounters preserving a largely constant distance between them.
Sticklebacks :
Sticklebacks are members of the fish family Gasterosteidae. They share ancestry with seahorses and pipefish. Small fish known as sticklebacks can be found in lakes, streams, brackish systems, and the ocean. Sticklebacks are less sensitive to salinity than the majority of other fishes, and they frequently coexist in fresh, brackish, and marine ecosystems.
Are sticklebacks edible ?Although sticklebacks aren't typically considered to be edible, they can supposedly be used to produce "a excellent and healthy fish-soup.
Size of sticklebacks :Sticklebacks are tiny, elongated fish that can grow up to 18 centimeters in length (7 inches). The family's members can be identified by a row of 2 to 16 spines on the back that are arranged in front of a dorsal fin with soft rays.
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Discuss the concerns Snelgrove has regarding the health and safety of our oceans and ocean life.
Dr. Snelgrove's interests include marine community ecology, larval ecology of invertebrates and fish, ecology of benthic invertebrates, hydrodynamic effects on benthic communities and populations, deep-sea ecology, coral reef ecology, biodiversity, and disturbance and anthropogenic impacts.
states that oceans contribute significantly to, not *only* sustaining life on Earth, but they are play a crucial part in nutrient cycling, food, and oxygen, and also influence the weather. As it is all connected, without oceans, there is no life.
What does a marine biologist do?The marine biologist studies the living beings that inhabit marine ecosystems, including not only the oceans, but also environments such as mangrove areas, beaches, coasts, reefs, estuaries, atolls and all other places where marine life can flourish.
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When performing an extraction with between an aqueous solution and organic solution what determines which layer ends up the bottom layer in the separatory funnel ?.
Answer:
When performing an extraction with between an aqueous solution and organic solution density determines which layer ends up the bottom layer in the separatory funnel.
Explanation:
For separating liquids, separatory funnel are used.
higher density liquid would accumulate at the bottom of the separatory funnel.
This aqueous layer, which contains water, is polar in nature, whereas the organic layer is nonpolar.
Because it can dissolve more things than every other liquid, water is known as the universal solvent. A hydrogen atom within water does have a positive charge, while the oxygen atom posses a negative charge. H2O is a polar covalent molecule.
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Scientists agree that organic molecules were first created in a "primordial soup” filled with compounds that reacted with energy and remained stable due to the absence of oxygen. This theory resulted from the work of which of the following scientists?
Scientists agree that organic molecules were first created in a "primordial soup” filled with compounds that reacted with energy and remained stable due to the absence of oxygen. This theory resulted from the work of J.B.S Haldane.
Primordial Soup- Alexander Oparin and John Haldane first suggested the notion of the primordial soup as a potential explanation for the genesis of life on our planet. According to the hypothesis, the components of life would be produced if energy is supplied to the gases which made up Earth's early atmosphere.
Organic Molecules- A complex molecule known as an organic is composed mostly of carbon atoms joined to other elements and/or other carbon atoms.
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Imagine you are standing at a microphone in front of a crowd. Checking your notes, you begin speaking. Using the information in this chapter, describe the series of events in particular regions of the brain that enabled you to say the very first word.
If your body is too hot, the hypothalamus will sweat. If you're too cold, the hypothalamus will make you shiver. Chills and sweating are attempts to raise your body temperature.
Summary:Your frontal, temporal, and parietal lobes form what you want to say, and the motor cortex in your frontal lobe allows you to say those words.
The cerebral cortex area responsible for organizing, directing, and carrying out voluntary motions is known as the motor cortex. Classically, the motor cortex is an area of the frontal lobe located in the posterior precentral gyrus just anterior to the central lobe.
What is the hypothalamus?The hypothalamus is an area of the brain that produces the hormone that controls: Body temperature. Heartbeat. Starvation. Surroundings.
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if an individual receives a faulty, mutated copy of a gene from his or her mother, that person will most likely acquire a genetic disorder. group startstrue or false
If an individual receives a faulty, mutated copy of a gene from his or her mother, that person will most likely acquire a genetic disorder. This statement is false.
If a person receives a mutated copy of the gene from the mother they will not have any disease unless the mutations are recessive and not dominant. If the mutation is dominant it will cause disease anyhow while if it is recessive it won't cause the disease or have low effects unless the same mutation gene is transferred from the father also.
Some examples or recessive autosomal diseases are sickle cell anemia, cystic fibrosis etc.
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How are the functions of FSH and LH in females and males similar?
The similar main function of FSH and LH in females and males is to follow up the gonadal cell and release sex hormones.
The hormones FSH and LH are gonadotropin hormones orchestrated by the front portion of the pituitary organ. These hormones serve comparative capabilities in the male and female bodies.
The FSH hormone is demonstrated by stimulating the development of tissues that manage the development and sustenance of the gametic cells. The capability of LH in both sexes is to set off the blend of essential sex hormones (testosterone and estradiol).
The follicle-stimulating hormone (FSH) and luteinizing hormone (LH) are gonadotropins that are delivered because of the feeling of the gonadotropin-releasing hormone (GnRH). These hormones have a comparative capability in the reproduction of the two females and males.
The prime function of FSH is to follow up on the gonadal cells and stimulate their development which thus capability to give sustenance to the creating gametic cells.
The function of LH is to improve the release of sex hormones from the gonadal cells (primarily estradiol in female bodies and testosterone in males); these hormones, thus, stimulate the course of gamete creation.
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Cells that contain nuclei are Eukaryotes.
Answer: That is true
Explanation: Eukaryotic cells contain a nucleus or nuclei and prokaryotic cells do not contain a nucleus.
Of a very humid day, people with chronic respiratory diseases may experience greater difficuly breathing because?
Of a very humid day, people with chronic respiratory diseases may experience greater difficulty breathing because humid air has more density and therefore it increases the resistance in the airway of the respiratory system.
Chronic respiratory diseases are those that create problems in the airways and make the breathing difficult. There are two most harmful disease: asthma and chronic obstructive pulmonary disease (COPD). The conditions may also lead to lung cancer.
Airway of the respiratory system is the pathway through which the air reaches inside the lungs. The organs involved in the airway are: nostrils, pharynx, larynx, trachea and bronchi.
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24.13 illustrates the formation of and possible outcomes for a hybrid zone over time. Imagine that two finch species colonize a new island and are capable of hybridizing. The island contains two plant species, one with large seeds and one with small seeds, growing in isolated habitats. If the two finch species specialize in eating different plant species, would reproductive barriers be reinforced, weakened, or unchanged in this hybrid zone? Explain.
Individuals of the two finch species may be less likely to encounter one another in the distinct habitats because they only ingest seeds from a single plant species, strengthening a reproductive barrier to hybridization.
What do you mean by hybridization?When two atomic orbitals join to generate a hybrid orbital in a molecule, the energy of the individual atoms' orbitals is redistributed to give orbitals of equivalent energy. We refer to this process as hybridization.
Why is hybridization necessary?In order to appropriately disperse their valence electrons around themselves in a way that each of them can be used to form a bond or lone pair and in a way that allows the proper bond angles, all atoms with two or more regions of electron density surrounding them must be hybridized.
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r. synthesis and microcontact printing of dual end-functionalized mucin-like glycopolymers for microarray applications angew. chem.
Glycopolymer can be utilized to display glycans on microarrays in native-like architectures.
What is Glycopolymer?Glycopolymer is a manmade polymer that has carbohydrates hanging from it. Glycopolymer are crucial for many biological recognition processes, including cell-cell adhesion, the growth of new tissues, and the virulent behaviour of bacteria and viruses.
Glycopolymer are crucial for many biological recognition processes, including cell-cell adhesion, the growth of new tissues, and the virulent behaviour of bacteria and viruses. They hold great promise for the manufacture of biocompatible materials, tissue engineering, and targeted medication delivery.
A synthetic polymer having hanging carbohydrates is called a Glycopolymer. Many biological processes, including cell-cell adhesion, the development of new tissues, and the behaviour of bacteria and viruses in spreading, depend on Glycopolymer.
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Which of the following is the main role of photosynthesis on Earth?
a
Supply needed reactants for cellular respiration
b
Generate oxygen for the atmosphere
c
Provide food for organisms that do photosynthesis
d
All above responses are correct
Answer:
all above the responces are correct
Community 1 contains 100 individuals distributed among four species: 5A, 5B, 85C , and 5D. Community 2 contains 100 individuals distributed among three species: 30A, 40B , and 30C. Calculate the Shannon diversity ( H ) for each community. Which community is more diverse?
Community 2 is more diverse than community 1.
Why can we conclude this?Because community 1 has a smaller distribution of individuals by species.Because community 2 has a greater distribution of individuals by species.Community 1 has 4 species, while community 2 only has 3 species but has a greater diversity than community 1.
This is because the distribution of individuals in each species is better established, allowing each species to have many members and that there is no majoritarian group.
Community 1, on the other hand, has a smaller distribution, because most individuals are grouped into a single species.
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an increase in the frequency of beneficial mutations in a population over many generations is called .
An increase in the frequency of beneficial mutations in a population over many generations is called natural selection.
Beneficial mutations are those that have some positive effect and aid in the growth and survival of the organism. These mutations are also inherited from parents to offspring and hence the survival of species for generations is ensured. Some examples of mutations that are beneficial are: lactose tolerance, trichromatic vision, etc.
Natural selection is the phenomenon of selecting those individual or species that are able to adapt and survive better in the changing environment. Natural selection favors the survival of the fittest. And therefore, natural selection favors beneficial mutations.
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(b) What was the rate of CO₂ concentration increase ( ppm / yr ) from 1975 to 2012?
The rate of CO₂ concentration increase ( ppm / yr ) from 1975 to 2012:
1971-1980 = 1.35 ( ppm / yr )
1981-1990 = 1.56 ( ppm / yr )
1991- 2000 = 1.55 ( ppm / yr )
2001- 2012 = 2.04 ( ppm / yr )
Carbon dioxide concentrations are rising typically due to the fossil fuels that human beings are burning for strength. Fossil fuels like coal and oil include carbon that vegetation pulled out of the atmosphere through photosynthesis over many tens of millions of years; we are returning that carbon to the environment in only a few hundred.
Due to the fact the northern hemisphere consists of much extra land than the southern hemisphere – which is more often than not covered with the aid of ocean – the quantity of carbon dioxide inside the atmosphere will increase universal all through the northern iciness.
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