The RNA world is a hypothesis associated with the emergence of life on Earth and it is important because states that RNA had catalytic functions.
What is the RNA world?The RNA world is a scientific theory that states life began as primitive organisms in which the RNA played a dual function, i.e., as genetic material and as an enzyme.
The RNA world theory is sustained by the presence of ribozimes, i.e., enzymes composed of RNA instead of proteins.
In conclusion, the RNA world is a scientific hypothesis associated with the emergence of life on Earth and this theory is important because it states that RNA had catalytic functions.
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Why does there need to be a concentration gradient across respiration surfaces?
A. So that oxygen can diffuse in, and carbon dioxide can diffuse out.
B. So that oxygen can diffuse out, and carbon dioxide can diffuse in.
C. So that there is no surface tension in the alveoli of the lungs.
D. So that there is surface tension in the alveoli of the lungs.
A concentration gradient across respiration surfaces is needed so that oxygen can diffuse in, and carbon dioxide can diffuse out; option A.
What is a concentration gradient?A concentration gradient is a difference in the concentration of molecule of substances across two regions or across a barrier.
A concentration gradient is necessary for diffusion of molecules of substances from one region to another.
Across respiratory surfaces, a concentration gradient is required in order for the gases to diffusion across the membranes from regions of high concentration to regions of lower concentration.
In conclusion, a concentration gradient is required for effective gaseous exchange across respiratory surfaces.
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The portion of the trna molecule that binds to the codon on the mrna is called the _________.
a) c-codon
b) anticodon
c) complementary codon
d) paracodon
(I’m a girl) I’m wanting to go on runs in the morning. However, I am both self conscious and afraid of getting kidnapped or other bad things happening to me.
How do I get over these feelings?
Answer:
(I am also a girl) Just keep some pepper spray on you. If you have a phone you can have it on you just either keep it out of sight or in a safe place within reach so if you need to you can call for an emergency. I bet you are beautiful, but if you are self-conscious I don't really know what to tell you other than try ignoring stares or what other people say it doesn't matter what other people think about you it only matters what you think of yourself. Also if someone ends up grabbing you kick and scream as loud as you can. Try hurting them to get out of their grasp. When you get out of their grasp, DO NOT run home, run to the nearest police station or to a stranger's house and tell them you need help.
Explanation:
I hope this helps you get over those feelings :) wish you the best.
Answer: On amazon they sell safety supplies ( pepper spray, mini knife, window breaker, etc) make sure somebody is with you so they can protect you to better to be in a group of two or more then alone
Explanation:
(((50 POINTS)))
Analyze the image below of the various carbohydrate classifications. Compare and contrast each classification of carbohydrates and their structural characteristics.
longer chain that shows more carbon is used so its not a alcohol only up to methanlo or up to 3 carbon is considered as alcohol
what are the basis of classifying organism under natural and artificial system of classification
Explanation:
The natural system of classification is a biological classification based upon morphological and anatomical relationships and affinities. Artificial systems of classification were based on morphological characters such as habit, habitat, colour, number and shape of leaves.
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What adaptation helps the
Orchid succeed in the
rainforest?
A. It grows long tap roots to reach
water sources.
B. It is one of the tallest trees in
the rainforest so it can reach the
sunlight.
C. It traps insects to gain extra
nutrients.
D. Instead of using energy
growing a trunk, it climbs other
plants to reach sunlight.
The adaptation which helps the
Orchid succeed in the rainforest is that It grows long tap roots to reach water sources.
What is adaptation?Adaptation can simply be defined as the ability of an organism to live adapt and live successfully in an environment
Other characteristics of living things are
MovementRespirationNutritionIrritabilityGrowthExcretionReproductionDeathCompetitionSo therefore, the adaptation which helps the Orchid succeed in the rainforest is that It grows long tap roots to reach
water sources.
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Question 4 (1 point)
Respiratory acidosis and respiratory alkalosis are
similar because they both
O a) the lungs can compensate for both of
these conditions.
Ob) increase the concentration of hydrogen
ions in the body.
O c) can be caused by changes in carbon
dioxide concentrations in the body.
Answer:
c) acidosis a higher carbon dioxide level
with alkalosis lower carbon dioxide
Which of the following correctly describes Metaphase?
A. Chromosomes split and move to opposite sides of the cell. the cell elongates
B. Mitotic spindle attaches to the chromosome's centromeres and lines them up in the middle of the cell
C. The Cytoplasm splits, forming two daughter cells
D. Centrioles move to opposite sides of the cell, nuclear envelop dissolves, chromosomes form
Reset Selection
A
Novt
During the metaphase, chromosomes are taken to the equatorial plane, were they randomly line up. Option B. Mitotic spindle attaches to the chromosome's centromeres and lines them up in the middle of the cell.
What is the metaphase?
Metaphase is one of the cell division stages that follows the prophase and precedes the anaphase.
During this phase, chromosomes are taken toward the center of the cell by the spindle apparatus. Once in the equatorial plane, chromosomes randomly line up.
Once aligned, each chromatid joins with a microtubule of opposites poles and gets ready to go through the anaphase. Sister chromatids are held together until they reach the Anaphase.
Since chromosomes in this stage are well defined and can be observed in detail under the microscope, they are used to create karyotypes and identify chromosomal abnormalities.
These chromosomes have the typical X shape.
Among the options, the one that correctly describes the metaphase is Option is B. Mitotic spindle attaches to the chromosome's centromeres and lines them up in the middle of the cell.
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In a community a species of birds has some individuals with a different size and others which statement correctly explains how physical differences in beaks would develop?
Physical differences in beaks of birds would develop as a result of different environmental changes.
What is Evolution?This is described as the process in which heritable characteristics are changed in species over successive generations. This occurs as a result of natural selection in which the traits suitable for survival are passed to the offspring.
This is usually as a result of a change in the environmental factors which ensures that the organisms are able to adapt so as not to die out and go extinct in this type of scenario.
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Which statement is the best example of nonscience?
A. Selective breeding and genetic modification produce wheat grains
with higher protein content.
B. Stalks of wheat are displayed during harvest season as symbols of fertility, life and abundance.
C. Wheat plants grow taller when they receive plenty of water and sunlight.
D. People with wheat allergies may benefit from remedies such as activated charcoal and apple cider vinegar.
Stalks of wheat are displayed during harvest season as symbols of fertility, life and abundance is the best example of non-science. Thus, option B is correct. since the selective breeding of wheat grains is science term.
What is selective breeding?Selective breeding which applies artificial selection by human when they can control breeding process of organisms in order to introduce or eliminate a desirable character or trait.
Majority of breeding focuses on the beneficial traits for humans, where the beneficial trait pass from parent to offspring via genes.
The desirable phenotypic traits are passed from parents to offspring via their genes.
Th drawbacks of selective breeding in some case the undesirable traits which cause hereditary and health problems.
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Answer:
B. Stalks of wheat are displayed during harvest season as symbols of fertility, life, and abundance.
ASAP PLEASE HELP... WRITE CORRECT ANSWER please
A power outage has occurred in the entire city where your hotel is located. It’s 10 pm and the utility company is working hard to restore power but has to prioritize hospitals and other emergency centers first, so you’ll be without power for at least 8 hours. You have two guests in two different rooms who use CPAP breathing devices that need to be plugged in; they only have about 3 hours of battery life.
What would you do?
staff training planning _________
Answer:
As we know, the human is advancing and therefore is doing complicated tasks; some even before they are being told. Hotels especcially nowadays have been storing electricity and stuff. It would be neccessary for you to consider that and help your patients using it.
The tyres of tractor are wide and large .Give reason.
Maybe this is the answer
Explain the structure and function of tissue systems in plants.
Answer:
Key Takeaways: Plant Tissue Systems
Epidermis is a thin cell layer that covers and protects underlying cells. The outer periderm, or bark, is a thick layer of nonliving cork cells. Vascular tissue is composed of xylem and phloem. These tube-like structures transport water and nutrients throughout the plant.
Answer:
function of tissue system:
Dermal tissue covers and protects the plant, and vascular tissue transports water, minerals, and sugars to different parts of the plant. Ground tissue serves as a site for photosynthesis, provides a supporting matrix for the vascular tissue, and helps to store water and sugars.
Explanation:
structure of tissue system:
Vascular tissue transports water, minerals, and sugars to different parts of the plant. Vascular tissue is made of two specialized conducting tissues: xylem and phloem. Xylem tissue transports water and nutrients from the roots to different parts of the plant, and also plays a role in structural support in the stem.
1. What effect does the music have on the murals as Sierra and Robbie danced?
Answer:
The impact of murals: the process and the paintings.
why are there multiple controlled variables but only one independent variable
All three regions of the brain stem can be observed on the ventral surface of the brain. True or false?.
Answer:
True
Explanation:
Description of damages caused by flood to lands, to infrastructures, damages to human lives, damages to crops, damages to other animals paragraph
Large debris and floodwaters can cause structural damage to bridges and roadways, making travel impossible. Power, telephone, and cable lines can be taken out by flash floods as well. Flood waters can disrupt or contaminate ground water, making tap water unfit for consumption.
What are the consequences of flooding?The cases of flooding in the basin generate numerous negative impacts on the population's quality of life, the consequences of these events are:
the difficulty in urban mobilityloss of real estate value of homeswhich may be affected in these eventsmaterial loss problemsWith this information, we can conclude that Floods have large social consequences for communities and individuals. As most people are well aware, the immediate impacts of flooding include loss of human life, damage to property, destruction of crops, loss of livestock, and deterioration of health conditions owing to waterborne diseases.
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A hole in the skin caused platelets to rush to the site and release a chemical that releases more platelets. This is an example of what type of mechanism
A hole in the skin caused platelets to rush to the site and release a chemical that releases more platelets. This is an example of a positive feedback mechanism.
Positive feedback mechanism:When a variable is changed, there is a response that leads to further change in the same direction, which is known as positive feedback.
An illustration can be used to explain positive feedback. Positive feedback aids in the quick creation of a platelet plug in a damaged blood artery when we cut our fingers. Platelets are drawn to the wounded location, and as they accumulate, they each release chemicals that draw additional platelets.
In order to stop excessive blood loss, numerous platelets quickly collect and work together to seal the damaged blood vessel's hole.
Positive feedback mechanisms are demonstrated by the posterior pituitary gland's production of oxytocin during labor. The muscle contractions that force the infant into the delivery canal are induced by oxytocin.
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25 POINTSSSSSSSSSWhat does this diagram represent?
The diagram presented represents hydrolysis of sucrose.
What is hydrolysis of sucrose?The hydrolysis of sucrose generates an equimolar mixture of fructose and glucose, commercially known as invert sugar.
Sucrose is a disaccharide with the formula C₁₂H₂₂O₁₁.
On hydrolysis, Sucrose yields the two monosaccharides, namely;
glucose (aldohexose) and fructose (ketohexose),However, on dehydration Sucrose produces a complex carbonaceous solid residue.
Thus, the diagram presented represents hydrolysis of sucrose.
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How do the continental coastlines support the Theory of Continental Drift (Pangaea Theory)?
Explain how fossil distribution supports the Theory of Continental drift.
How do distinctive rock strata support the Theory of Continental Drift?
Honor Biology:
How does coal distribution support the Theory of Continental Drift?
Evidence like the same type of rocks and fossils in continents separated by the ocean, continental coastlines fitting together, and the presence of coal in polar regions support the Theory of Continental Drift.
What are the tectonic plate and continental drift theories?The tectonic plates theory explains the movement of the different plates based on the crust movements.The continental drift theory explains how these plate movements have been taking place for millions of years.Alfred Wegener proposed for the first time that continents were once all together in one big continent named Pangea, and with time, they split and separated into many pieces.
Although Wegener’s theory was criticized, the geologist Du Toit published in 1937 a list of 10 pieces of evidence that would support the theory of tectonic plates and continental drift.
What is the evidence that support the theories of tectonic plates and continental drift?Wegener, Du Toit, and other following researchers made use of the following list of evidence to prove these theories,
Gondwana glaciation evidence,
Lithological and structural evidence
Sedimentary layers, chronologically deposited, reflect history through their composition.
The same type of rocks of similar age express the same chronological deposition in continents currently separated by the ocean.
This fact also suggests that continents were once together and these rocks formed simultaneously in the same place.
Plates fitting together
Continental coastlines seem to fit with each other. For instance, the South American coastline seems to fit perfectly with the African coastline.
Paleontological evidence. Fossil distribution.
Plant and animal fossils distributed in different continents in the same sedimental layers suggest that these land masses were once together composing a big unique continent.
When reconstructing the supercontinent, the areas in which these fossils were found get together in the same supercontinental region.
Finding the same fossils in the same sedimental layers suggests that these continents were once together, and these organisms used to live in the same region.
Coal distribution
Since coal gets formed under warm to hot and humid climatic conditions, it is suggested that coal found in Antarctic areas and other regions near the poles, was formed when the continents were together near the equatorial region.
How do the continental coastlines support the Theory of Continental Drift (Pangaea Theory)?
Because continental coastlines fit together. For instance, South America and Africa.
How fossil distribution supports the Theory of Continental drift?
Because the same fossils are found in the same sedimental layers of continents separated by the ocean.
How do distinctive rock strata support the Theory of Continental Drift?
Because the same type of rock of the same age are found in the same sedimental layers of continents separated by the ocean.
How does coal distribution support the Theory of Continental Drift?
Because the coal found under Antarctica and other polar regions must have formed in warmer and more humid areas, such as the Equator, suggesting plate displacement.
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In the water cycle shown below, which process is happening at step 3? precipitation
melting
evaporation
sublimation
Answer:
melting
Explanation:
because the water has got its freezing ponit
Answer: A: precipitation
Explanation: it is raining took the test this is the right answer
Who do you believe is guilty of the murder? What evidence supports your conclusions? (4 points)
Right from time immemorial, guilty is considered a murder situation in as much as one as been confirmed truthfully responsible as what one as been charged of.
What is murder?This is a deliberate act of killing another being, especially human.This is a crime against humanity and it is punishable.
Guilty means to be responsible for a dishonest act especially judged to have committed a crime.
Evidence which shows that guilty is a murder is simply in the scriptural books such as the Bible and Qur'an. The judge in his book too has whatever one is guilty of as a murder in his book.
So therefore, right from time immemorial, guilty is considered a murder situation in as much as one as been confirmed truthfully responsible as what one as been charged of.
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Answer:
Steve O'Hare
Blood Type Match
Explanation:
The murderer was the boss, Steve O'Hare, because the blood on the door matched his blood, so he possibly struggled to kill her and she was able to hit him or try to defend herself which is possibly why his blood was on the door
Identify the suggested set of activities for the given
corresponding principle(s).
1. Programs and teachers engage families in ways that
are truly reciprocal.
2. Programs invite families to participate in program-
level decisions and advocacy efforts.
3. Programs invite families to participate in decision-
making and goal-setting for their children.
4. Programs provide learning activities for the home and
in the community.
5. Programs implement a comprehensive, program-level system of family engagement.
6.Teachers and programs engage families in two-way communication.
The suggested set of activities for the corresponding principles regarding the Programs and teachers is explained below.
How to explain the information?1. Programs and teachers engage families in ways that are truly reciprocal.
Programs and families can benefit from shared resources and information. Teachers seek information about children’s lives, families, and communities.2. Programs invite families to participate in program-level decisions and advocacy efforts.
Programs invite families to actively participate in making decisions about the program itself. Programs also invite families to advocate for early childhood education in the wider community.3. Programs invite families to participate in decision-making and goal-setting for their children.
Programs invite families to actively take part in making decisions concerning their children’s education. Teachers and families jointly set goals for children’s education and learning both at home and at school.4. Programs provide learning activities for the home and in the community.
Programs use learning activities at home and in the community to improve each child’s early learning.5. Programs implement a comprehensive, program-level system of family engagement.
Programs institutionalize family engagement policies and practices and ensure that teachers, and other staff receive the supports they need to fully engage families6. Teachers and programs engage families in two-way communication
Strategies allow for both school- and family-initiated communication that is timely and continuous. Conversations focus on a child’s educational experience as well as the larger program.Learn more about teachers on:
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Answer:
1. Family Showcase, Family/Teacher Conference, Family Focus Groups
2. Family Council Advocacy Events
3. Beginning-of-the-Year Family Night, Family/Teacher Conferences, Surveys and Questionnaires
4. Weekly Newsletters, Take-Home Backpacks, Make-and-Take Nights
5. Plans including, short-term and long-term goals
6. Daily Sheets, Journal, Technology/Apps, Telephone Conferences
Explanation: Penn Foster
What happens when the number of organisms in an environment is higher than the carrying capacity? A. The population will increase slowly. B. The population remains the same. C. The population will increase quickly. D. The population will decrease.
Answer:
When the number of organisms in an ecosystem exceeds the carrying capacity, the population will decrease.
Please see the explanation!
Explanation:
The maximum that can be maintained forever is the concept of "carrying capacity." This can only be rationally understood as the highest number that can be maintained using exclusively renewable resources. It can only be exceeded by using resources more quickly than they can be replenished.
The population gets wiped out (not by old age mortality) back to the number that can be maintained using only renewable resources when those resources become limited, as they must by definition.
Remember that every population is trying to expand, therefore if a species finds a resource that it can use more quickly than it replenishes, the population will undoubtedly expand to use that newly discovered capability. Another way to put this is to say that when the species average is x newborns and the subsistence supply is steady, (x-2)/x children must perish. Less offspring must perish than the formula predicts when the species finds a new non-renewable source of food, increasing the subsistence supply.
It should be noted that there are plainly too many people in the world. Over the past few hundred years, we have developed various technologies that have increased subsistence extraction and decreased waste. Of course, we have multiplied to occupy that additional space. In order to provide enough food to sustain 7+ billion people at once, we need fossil fuels and a number of other resources that do not replenish as quickly as we use them. The last time humanity were able to maintain their population on exclusively renewable resources, there were less than 1 billion people. Be aware that we have never been able to raise subsistence production as quickly as we have sought to increase our population. We have always had an average of too many infants, as seen by the starvation-related child mortality that affects some populations.
Thank you,
Eddie
amplitude
frequency
trough
wavelength
Answer:
get foundational structure off amplitude
What discoveries early-on helped man establish himself on Earth?
hammer
knife
fire
pottery (cooking)
rope (fishing)
When is a mutation considered beneficial?
A. when it decreases an organisms life span
B. when it decreases an organism's fertility rates.
C. when it gives an organism an evolutionary advantage
D. when it makes an organism more vulnerable to predators
Answer:
C!
Explanation:
Of course you would want to evolve against your predators! Many examples of this include camouflage, gills, or mimicry. Hope this helps!
13. Which of the following drugs is not a hallucinogen?
A. Mescaline
B. PCP
C. Heroin
When mites or fleas live in a dog's fur, what type of relationship is it?
A. Predatory
B. Parasitic
C. Mutualistic
D. Monogamous
When mites or fleas live in a dog's fur, it represents a type of relationship known as a Parasitic relationship. Thus, the correct option is B.
What is the Species relationship?The species relationship may be defined as a process through which the population of one species interacts with the population of another species that lives in the same locality for the purpose of food, space, and shelter.
A parasitic relationship is when one group of organisms known as parasites live on another group of organisms known as hosts and negatively harm it as well as possibly induce death.
The same principle is applied to the mites or fleas that live on dogs' fur. These species gradually cause disease in dogs using hosts machinery and provoking death.
Therefore, when mites or fleas live in a dog's fur, it represents a type of relationship known as a Parasitic relationship. Thus, the correct option is B.
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Need help please with this
TSH controls hormone synthesis, ADH decreases urine, melatonin is involved in circadian rhythm, TH regulates metabolism, insulin is produced in the pancreas and Aldosterone regulates salt.
What is a hormone?A hormone is a chemical messenger used by the body to play a specific function and thus maintain homeostatic balance.
Hormones are secreted by specialized cells such as insulin that is secreted by pancreatic islet cells in this organ (i.e., the pancreas).
In conclusion, the function of TSH is to control hormone synthesis in the thyroid, ADH decreases the amount of urine, melatonin is involved in circadian rhythm, TH is a thyroid hormone that regulates metabolism, insulin is produced in the pancreas and Aldosterone regulates salt amount.
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