Biodiversity hotspots are the richest and most threatened reservoirs of life on Earth. Thus, the correct option is D.
What are Biodiversity hotspots?Biodiversity hotspots may be defined as the regions of the earth which are rich in biodiversity and possesses the following criteria:
The area should support greater than 1500 endemic species of flowering plants or 0.5% of total plants. It possesses a high degree of threat, exploitation, and biodiversity. It must have lost about 70% of the original habitat.A high degree of endemism (restricted habitat).Therefore, Biodiversity hotspots are the richest and most threatened reservoirs of life on Earth. Thus, the correct option is D.
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Suppose a cell's membrane is permeable to water, but not to Na^ or Cl^- or any other solute. The NaCl concentration is higher outside the cell than inside the cell, and the osmolarity of the cell is higher than that of the solution surrounding the cell. What will occur
If NaCl concentration is higher outside the cell than inside the cell, and the osmolarity of the cell is higher than that of the solution surrounding the cell then Overall, the cell will take up water because it is hypertonic.
Osmosis is the transfer of a solvent from a region of lower solute concentration to a region of higher solute concentration through a semi-permeable membrane. The dissolved solutes—the sodium and chloride ions that make up salt—cannot traverse the barrier but the water in the surrounding solvent can enter the membrane. In these circumstances, water from the solute environment will cross the membrane to balance the solute content on each side. When there are more solutes outside the cell than inside it, an environment is said to be hypertonic for cells, and it is said to be hypotonic for cells where there are fewer solutes outside than inside the cell. There is no net water movement when solute concentrations are the same on both sides of the cell, and the cell is referred to as isotonic.hence , here the cell is hypertonic thus the cell will take up water and swell but the solutes like NaCl will not enter the cell.
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Original Codon: CTC GAG
Mutated codon: GTC CAG
Which of the following choices refers to the appropriate amino acid of the original and mutated code?
A. Glutamic acid and Glutamine
B. Valine and Lysine
C. Serine and Isoleucine
D. Proline and Tryptophan
The original codons code for Leucine and Glutamic acid. The mutated codons code for Valine and Glutamine.
Genetic codes and amino acidsEach of the genetic codes. otherwise known as codons, translates to an amino acid.
Following the table of genetic codes with their respective amino acids:
CTC (CUC) codes for LeucineGAG codes for Glutamic acidGTC (GUC)codes for ValineCAG codes for GlutamineThus, the glutamic acid in the original codon has been replaced with glutamine in the mutated codon while Leucine has been replaced with Valine.
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In thermoregulation, blood carries heat to the ____________________ where it is lost due to evaporative cooling.
Answer:
skin capillairies
Explanation:
In thermoregulation, blood carries heat to the skin capillaries where it is lost due to evaporative cooling.
What is thermoregulation?Thermoregulation is an interaction that permits your body to keep up with its center inner temperature. All thermoregulation systems are intended to return your body to homeostasis. This is a condition of balance.
A solid inner internal heat level falls inside a thin window. The typical individual has a gauge temperature between 98°F (37°C) and 100°F (37.8°C). Your body has some adaptability with temperature. Nonetheless, assuming you get to the limits of internal heat level, it can influence your body's capacity to work.
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What will happen to blood flow if the resistance to flow increases, while the pressure gradient across a blood vessel remains constant
Answer:
As resistance to flow increases, blood flow will decrease
Explanation:
Resistance is a force that opposes the flow of a fluid. In blood vessels, most of the resistance is due to vessel diameter. As vessel diameter decreases, the resistance to flow increases and blood flow decreases.
Two functions of bile salts during digestion
Answer:
Emulsify fats and make vitamins soluble
Hox genes Group of answer choices appear to function in similar ways across diverse groups of organisms. function only in fruit flies. control which amino acids get plugged into polypeptide chains. control the development of language in human
It appears to function in similar ways across diverse groups of organisms.
The Hox gene, a subset of the homeobox gene, is a group of related genes that specify the region of the embryo's body plan along the cranio-caudal axis of the animal. Hox proteins encode and specify "positional" properties to ensure that the right structure is formed in the right place in the body.
The hox genes are a subset of homeotic genes.The function of the hox genes is to control the development of the body plan of an individual during the embryonic stage.Thus, the basic body form of an organism is laid down with the help of these genes.These genes are present in many different species from fruit fly to mice to humans.The reason that they are present in different organisms is that there was a common ancestor that possessed the hox gene cluster and then the genes were passed on to different vertebrates. However, the slight changes that have occurred in these genes are due to duplication events.Learn more about Hox gene here:https://brainly.com/question/22998796
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How did Benjamin Franklin's lifelong use of spectacles eventually lead to an invention?
Franklin discovered that his eyesight was getting poorer as he got older, and he raised both near-sighted and far-sighted. Tired of changing between two pairs of eyeglasses, he invented “double spectacles,” or what we now named as bifocals.
Who was Benjamin Franklin?Benjamin Franklin was an American polymath and one of the Founding Fathers of the United States. Franklin was a leading author, printer, political theorist, politician, freemason, postmaster, scientist, inventor, humorist, civic activist, statesman, and diplomat.
As a scientist, he was a major figure in the American Enlightenment and the history of physics for his discoveries and theories regarding electricity.
As an inventor, he is known for the lightning rod, bifocals, and the Franklin stove, among other inventions. He founded many civic organizations, including the Library Company, Philadelphia's first fire department and the University of Pennsylvania.
Thus, this Could be the answer.
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What is unique about how fish live in groups?
Answer:
Fish generally prefer larger groups over smaller groups. They prefer groups with similar species.
Explanation:
3. What happens as a population approaches carrying capacity?
a. Density-Dependent factors have a greater effect.
b. Density-Independent factors have a smaller effect.
c. Density-Independent factors have a greater effect.
d. Density-Dependent factors have a smaller effect.
Answer:
The intensity of density-dependent factors increases.
Explanation:
Answer:
Density dependant factors have a greater effect
Explanation:
As population increases the population density also increases
It puts overload on carrying capacitySo density dependant factors increases their intensity
One problem with eradicating invasive species is that sometimes the disturbed area is unable to be colonized by native species. For example, in forests where the invasive plant garlic mustard has been removed, native plants and animals do not recolonize because they are extinct in that patch of forest. How should restoration ecologists increase species diversity and recover ecosystem function
In forests where the invasive plant garlic mustard has been removed, native plants and animals do not recolonize because they are extinct in that patch of forest. Restoration ecologists should Develop movement corridors for primary producers to increase species diversity and recover ecosystem function.
Patches are connected by corridors, which improves the watershed's overall habitat quality. They offer relatively risk-free access for wildlife to a variety of habitat resources that are often distributed throughout the terrain and may fluctuate with the seasons and temperature. Instead of being linear habitats, movement corridors, also known as dispersal corridors or landscape links, serve as a link between at least two key habitat areas.According to certain theories, corridors for primary producers facilitate the movement of species between different habitat areas, fostering genetic exchange and lowering population fluctuations.learn more about invasive plant here: https://brainly.com/question/1542287
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Native plants and animals do not recolonize in forests where the invasive species garlic mustard has been eradicated because they are extinct in that area of the forest. To boost species variety and restore ecosystem function, restoration ecologists should create movement corridors for primary producers.
What are primary producers?Primary producers are organisms that can make their own food, such as plants and phytoplankton, through photosynthesis or chemosynthesis.
Patches are connected by corridors, which enhances the overall habitat quality of the watershed.
They give wildlife reasonably risk-free access to a variety of habitat resources that are frequently dispersed over the landscape and may change with the seasons and temperature.
Movement corridors, sometimes referred to as dispersal corridors or landscape connections, connect at least two important habitat areas rather than being linear ecosystems.
Some hypotheses contend that main producer corridors encourage species mobility between various habitat types, promoting genetic exchange and reducing population volatility.
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what are the cause of thrombosis
Answer:
Injury to the vain.
Explanation:
Thrombosis is affected by virchows triad of stasis, turbulence and coagualability of the blood. An increase in any of these three can cause thrombosis.
The blood pools in the legs when we stand or sit and we very rarely are in a situation where gravity aids in draining blood from the legs. The body forces the blood up the legs by squeezing it up when we contract our leg muscles. We have one way valves in these veins to prevent the blood from falling back down the vein. So if we are in a situation where we are vertical for long periods of time or not moving our muscles or have had a previous thrombosis that has damaged our venous valves this can further increase the stasis already present in the legs and precipitate a thrombosis. It is this predisposition to stasis that causes dost thrombosis to occur in the legs.
Flying causes DVTs for this reason as we are sitting still for long periods of time. Also the recycled air can cause dehydration which increases the coagulability of the blood.
Based on the results of the kinetics studies and the observed tm, what is the best conclusion regarding the role of the metal centers in catalysis and enzyme conformational stability?.
Answer:
The role of the metal centers is in catalysis and enzyme conformational stability.
Explanation:
Which statement describes one way that wind energy is different from energy from fossil fuels?
O Wind energy reliability can be inconsistent.
O Wind energy produces larger quantities of energy.
O Wind energy can be reproduced quickly.
Wind energy produces more pollution.
Wing energy is reliable but is less consistent. The correct option is A.
What are fossil fuels?Fossil fuels are derived from the decomposition of plants and animals. These fuels, which can be encountered in the Earth's crust and encompass carbon and hydrogen, can be burned for energy.
Fossil fuels include coal, oil, and natural gas. These are consistent source of energy. On the other hand, wind energy is reliable but is not really consistent.
Thus, the correct option is A.
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Select the correct answer.
What kind of solution occurs in your mouth when you eat something with a high salt content?
A.
a hypotonic solution
B.
an isotonic solution
C.
a hypertonic solution
Answer:
Explanation:
A
Assertion: The factors that cause mutations are called mutagens.
Reasoning: Radiation, UV light, and chemicals are examples of mutation.
Which of the following is true for the above statements?
A. Both (A ) and (R) are true, but (R) is not the correct explanation of A.
B. Both (A ) and (R) are true, but (R) is the correct explanation of A.
C. A is false and (R) is true.
D. A is true and (R) is false.
Answer:
The following that is true about the statements is letter A, Both (A ) and (R) are true, but (R) is not the correct explanation of A.
Explanation:
A mutagen is any physical, chemical or biological agent that, when exposed to cells, is capable of inducing a mutation, that is, damage to the DNA molecule that is not repaired at the time of cell replication, and is passed on to subsequent generations.
With that being said, Radiation, UV light, and chemicals are exemples of mutagens.
Examples of mutation would be: gene or chromosomal mutations. Gene mutations can be by substitution, insertion or deletion; on the other hand, chromosomal mutations can be structural or numerical.
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Scientists study many different species, including mice, fruit flies, and monkeys to better understand human genes and how they lead to diseases. Why
Scientists study many different species to better understand human genes and how they lead to diseases due to an approach called comparative genomics.
What is comparative genomics?Comparative genomics is a subfield in genetics aimed at understanding gene function by comparing evolutionarily conserved sequences.
Comparative genomics is based on the alignment of homo-logous gene sequences between different species.
In conclusion, scientists study many different species due to an approach called comparative genomics.
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Peter and rosemary grant began studying the galapagos finches in 1973. For about 40 years, they studied the finches on daphne major. Why was this an ideal place to study the evolution of the finches?.
Peter and rosemary discovered a natural ecosystem with an extreme climate, oscillating between cycles of intense drought and abundant rainfall, as well as an uncontaminated area that had never been explored by humans. This was an excellent location to study the evolution of Galapagos finches.
For their outstanding long-term studies showing evolution in action in Galápagos finches, Peter and Rosemary Grant are renowned.They have shown that natural selection is responsible for the incredibly quick changes in body and beak size in response to variations in the availability of food.Due to the lack of predators or rivals for the finches, Daphne Major makes an excellent location for research. (The cactus finch is the only other finch on the island.) The weather, and consequently the availability of food, has a significant impact on the medium ground finch's capacity to survive.learn more about Galápagos finches here: https://brainly.com/question/960688
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What phase is the indicated cell currently in?
Answer:
In eukaryotic cells, or cells with a nucleus, the stages of the cell cycle are divided into two major phases: interphase and the mitotic (M) phase. During interphase, the cell grows and makes a copy of its DNA. During the mitotic (M) phase, the cell separates its DNA into two sets and divides its cytoplasm, forming two new cells.
Explanation:
In a group of muskmelon plants, some individuals have sour fruit and others have sweet fruit. in this group, the gene for the fruit taste trait has two alleles. the allele f is for sour fruit, and the allele f is for sweet fruit. a certain muskmelon plant from this group has sweet fruit. this plant has two alleles for sweet fruit. based on this information, click the blue words to correct any errors in the text. this muskmelon plant's genotype for the fruit taste trait is sweet fruit. this muskmelon plant's genotype for the fruit taste gene is ff. this muskmelon plant is homozygous for the fruit taste gene.
Correct option(s):
(b) This muskmelon plant's genotype for the fruit taste gene is ff.
(c) This muskmelon plant is homozygous for the fruit taste gene.
A dominant allele is one that is capable of expressing itself even in the heterozygous condition and overshadows the effect of the recessive allele. It is usually denoted by a capital letter. Recessive allele on the contrary cannot express in presence of a dominant allele and is denoted by a small letter.
In the given case the fruit with a sour taste (phenotype) can have two possible genotypes (FF and Ff). The genotype of sweet taste is ff which is a homozygous condition.
Note: Your question is incomplete, probably your complete question is “In a group of muskmelon plants, some individuals have sour fruit and others have sweet fruit. in this group, the gene for the fruit taste trait has two alleles. the allele F is for sour fruit, and the allele f is for sweet fruit. a certain muskmelon plant from this group has sweet fruit. this plant has two alleles for sweet fruit. Choose the correct option:
(a) this muskmelon plant's genotype for the fruit taste trait is sweet fruit.
(b) this muskmelon plant's genotype for the fruit taste gene is ff.
(c) this muskmelon plant is homozygous for the fruit taste gene.”
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Too much logging in the oyamel fir forests could lead to the eastern monarch butterfly going extinct because _______. a. the entire population of the species spends winter in oyamel c. the winters are too cold in oyamel b. the butterflies breed in the oyamel fir trees d. the butterflies feed on the oyamel fir trees please select the best answer from the choices provided a b c d
Too much logging in the oyamel fir forests could lead to the eastern monarch butterfly going extinct because the entire population of the species spends winter in oyamel fir forests.
Why it is the correct option:
a. The oyamel fir forests serve as the winter home for the eastern monarch butterflies. The entire population of monarch butterflies moves to oyamel fir forests in Mexico during winters to protect themselves from the freezing cold temperatures of their natural, breeding habitat. So, too much logging of the oyamel fir trees will destroy the winter habitat of these butterflies, and hence will lead to the decline in their population.
Why the other options are incorrect:
b. the butterflies breed in the oyamel fir trees is an incorrect option because the monarch butterflies breed in their natural habitats in the US.
c. the winters are too cold in oyamel is an incorrect option because these butterflies move to oyamel forests to protect themselves from cold.
d. the butterflies feed on the oyamel fir trees is an incorrect option because the monarch butterflies feed on milkweed.
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Sebum contains ________ which contributes to creating an inhospitable environment on the surface of the body.
Sebum contains Fatty acids which contributes to creating an inhospitable environment on the surface of the body.
Sebaceous glands are tiny exocrine glands located at various body regions except for the palm and sole of feet. The glands produce oily substances called sebum, containing lipids (triglycerides), waxes, and fatty acids.Acne is a condition that happens due to the clogging of skin pores, leading to the formation of whiteheads, blackheads, and pimples.Acne usually appears on the forehead, cheeks, neck, back, and chin region. The skin pores get clogged due to bacteria, ingrown hairs, excess production of sebum (oil), hormones, and dead skin cells.learn more about Sebum here: https://brainly.com/question/10723558
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Blood types A and B are codiminant and completely dominant to blood type O. A person with blood type AB has a child with a person with blood type O. What percent of their children are likely to express blood type O?
Answer:
The answer would be 0%
Explanation:
When you do the Punnett square of the couple (AB x OO), The blood would only be type A or B. The blood types dominate over blood type O since O is a recessive trait. So, blood type O would only possibly show if both parents have the trait.
The percentage of children that will likely express the blood type O is 0%. Details about genetic crosses can be found below.
What is co-dominance?Co-dominance is condition in which both alleles of a gene pair in a heterozygote are fully expressed, with neither one being dominant or recessive to the other.
According to this question, blood types A and B are codiminant and completely dominant to blood type O.
This means that if a person with with blood type AB has a child with a person with blood type O, the offsprings of this cross will have the following genotype:
AOBOTherefore, the percentage of children that will likely express the blood type O is 0%.
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The sum of all chemical activities taking place in an organism is its _______________ , which consists of all of the reactions that synthesize substances (_______________) as well as all of the reactions that break down substances (_______________).
a.
metabolism; anabolism; catabolism
b.
catabolism; anabolism; metabolism
c.
catabolism; metabolism; anabolism
d.
anabolism; metabolism; catabolism
e.
metabolism; catabolism; anabolism
a. metabolism; anabolism; catabolism
The sum of all chemical activities taking place in an organism is its metabolism which consists of all of the reactions that synthesize substances (anabolism) as well as all of the reactions that break down substances (catabolism).
What is metabolism?A living thing's metabolism is the culmination of all the chemical activities that occur inside each cell and supply the energy for both essential functions and the synthesis of new organic material.
Anabolism:
The main functions of anabolism include growth and arrangement of molecules. Small, straightforward molecules are expanded into bigger, more complex ones throughout this process. In anabolism, gluconeogenesis is a prime example. At this point, glucose is created by the liver and kidneys from non-carbohydrate sources.
Catabolism:
When food is digested, the molecules break down in the body to be used as energy, which is known as catabolism. The body breaks down large, complicated molecules into smaller, simpler ones. Glycolysis is an example of catabolism. Almost the opposite of gluconeogenesis is this process.
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In metabolic channeling, enzymes and metabolites are differentially distributed among separate cell structures or organelles and this different distribution is called _________.
In metabolic channeling, enzymes and metabolites are differentially distributed among separate cell structures or organelles and this different distribution is called compartmentation.
What is Metabolic channeling?Metabolic channeling may be defined as the representation employed to illustrate the limited discharge of substrates and products in multienzyme systems.
This metabolic channeling is catalyzed with specific enzymes and metabolites and then releases the product in the specific cell structures or organelles only.
This activity of channeling is known as target-specific channeling and the process that mediates this activity is known as compartmentation.
Therefore, it is well described above.
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Sequence the following events involved in skeletal muscle cell contraction.
1. sodium channels open and sodium flows in. 2. impulse reaches axon's synaptic knob. 3. Ach binds to receptors on the muscle cell membrane. 4. Synaptic vesicles fuse with neuron's membrane and release ACh via exocytosis. 5. If enough sodium moves in to the muscle cell, an impulse (action potential) develops.
A. 2,4,3,1,5.
B. 1,2,3,4,5.
C. 3,5,2,1,4.
D. 3,4,5,1,2.
E. 2,1,3,4,5.
Muscle contraction occurs when a motor neuron sends a signal (Ach) to the muscle cell, depolarizing it, and triggering contraction. The correct option is A. 2,4,3,1,5.
How does muscle contraction occur?Just before muscle contraction occurs, there is a sequence of events that involve motor neurons, neurotransmitters, and ion flow.
1) The central nervous system generates an action potential that travels to the muscle fiber activating the calcium channels.
2) Calcium triggers vesicle fusion to the presynaptic membrane releasing acetylcholine (Ach) into the synaptic space.
3) Once released, Ach moves forward to the postsynaptic membrane of the skeletal muscle fiber where it binds to its receptors causing ion channels to open.
4) Positively charged sodium ions cross the membrane to get into the muscle fiber (sarcoplasm) and potassium leaves the cell.
5) The difference in charges caused by these ion transport charges positively the muscle fiber membrane. It depolarizes.
6) The action potential enters the t-tubules depolarizing the inner portion of the muscle fiber. Contraction initiates.
The correct sequence is as follows,
2. impulse reaches axon's synaptic knob.
4. Synaptic vesicles fuse with neuron's membrane and release ACh via exocytosis.
3. Ach binds to receptors on the muscle cell membrane.
1. sodium channels open and sodium flows in.
5. If enough sodium moves in to the muscle cell, an impulse (action potential) develops.
The correct option is A. 2,4,3,1,5.
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Which of the following is NOT an example of a selection pressure?
A. A tiger hunting prey
B. Surgery
C. Beginning of an ice age
D. Antibiotics
abc or d and a simple explanation
pls be sure of ur answer
Answer:
B. Surgery
Explanation:
I am not entirely sure but based on the definition of selection pressure (which talks about how external agents affect the survival of an organism) surgery is does not meet the definition.
A tiger hunting a prey affects the survival of prey. Beginning of ice age is an environmental agent that can affect survival of organism that cant tolerate cold. Antibiotics are drugs that can kill bacteria thus lower their survival. Surgery can actually increase survival if some form of disease is being treated.
What are some ways that humans negatively affect the environment?
Answer:
Explanation:
1) We exploit natural resources to our fullest extent. For example, we perform deforestation to get raw products for manufacturing stuff. Deforestation can lead to wide array of problems like soil erosion, landslides, and even extinction of animal species.
2) We pollute, like a LOT! Look up plastic islands in ocean or microplastics found in fish or even some mammals. We dump stuff into ocean which can not only pollute the water but also kill marine life.
3) We burn fossil fuels which releases gases that trap heat in earth's atmosphere and result in global warming.
4) the list goes on and on and on and on......
Which statement best describes the effect of the loss of a keystone species from an ecosystem?
A) A new keystone species would take the place of the old one.
B) The populations of other species in the ecosystem would fluctuate dramatically.
C) Species from nearby ecosystems would invade and overtake the unstable ecosystem.
D) Organisms that depended upon the keystone species would quickly adapt to a different species.
The populations of other species in the ecosystem would fluctuate dramatically. Thus, option "B" is correct.
What is the role of keystone species?When an organism exists in an ecosystem in such a way that it impacts and influences in the ecosystem and has a significant effect incomparable to its number in the population,such organism is said to be a Keystone species. They are responsible for the structure and continue existence of the ecosystem. Thus their absence leads to change in the ecosystem structure.
They maintain ecosystem structure for example by suppressing the population of one species of organism. E.g if a keystone species is a predator, its continuous predation on the herbivores which graze over a particular land area maintains balance between the green plant population and nutrient cycles in the ecosystem. If the the Keystone does not exits overgrazing from the increasing population of the grazers will disrupt the energy and nutrient cycles in the ecosystem, with dramatic change in the ecosystem.
Thus, option "B" is correct.
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What makes predicting a volcanic eruption difficult?
A. Since there are so many volcanoes, and many only erupt every few hundred years, it is impossible to monitor them all at the right time.
B. All of these
C. Monitoring potential eruptions is expensive.
D. Even if magma movement is detected, it often cools underground and no eruption occurs.
The Factor that makes predicting a volcanic eruption difficult is : ( B ) All of these
Frequency of volcanic eruptionsMany volcanoes erupt once every one or two centuries, therefore it can be difficult to monitor all these volcanoes simultaneously, also financial constraints leads to unavailability of adequate data to monitor volcanoes, and not every magma movement leads to a volcanic eruptions as some volcanoes have one seismometer
Therefore we can conclude that The Factor that makes predicting a volcanic eruption difficult is : ( B ) All of the options listed in the question
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1. Describe the effect on the rate of photosynthesis if the temperature is increased from 10°c to 20°c
Answer:
As temperature increases the number of collisions increases, therefore the rate of photosynthesis increases.
Explanation:
However, at high temperatures, enzymes are denatured and this will decrease the rate of photosynthesis