Answer:
The giant-impact hypothesis, sometimes called the Big Splash, or the Theia Impact suggests that the Moon formed out of the debris left over from a collision between Earth and an astronomical body the size of Mars, approximately 4.5 billion years ago.
evidence: evidence for the giant impact scenario comes from rocks collected during the Apollo Moon landings, which show oxygen isotope ratios nearly identical to those of Earth.
Comparison of the zinc isotopic composition of lunar samples with that of Earth and Mars rocks provides further evidence for the impact hypothesis.
The giant impact hypothesis suggests the Moon was formed from the collision of a Mars-sized body with the Earth, flinging material into orbit that later became the Moon. Evidence such as oxygen isotope similarities and computer simulations bolster this theory, despite geological activity obscuring direct evidence.
Explanation:The Giant Impact Hypothesis
The giant impact hypothesis proposes that the Moon was created from debris ejected into space after a Mars-sized body (approximately one-tenth of Earth's mass) collided with the early Earth. This event is conjectured to have occurred early in Earth's history, and it is suggested that it was one of the largest impacts Earth could endure without being completely destroyed. Due to the magnitude of the impact, material from both the Earth's mantle and the impacting body was thrown into orbit, which eventually coalesced to form the Moon.
Evidence Supporting the Hypothesis
Although direct evidence of such a colossal event is challenging to find due to the geological activity of Earth that continuously remodels its surface, there is supporting evidence for the giant impact hypothesis. This includes the similarity of oxygen isotopes found on the Moon and Earth, which suggests a common origin. Another piece of evidence is the Moon's composition, which is remarkably similar to the Earth's mantle. Additionally, computer simulations match the current Earth-Moon system's dynamics when modeled with a giant impact event.
When should you refuse to accept food in a shipment?
When there are dented cans
When the food is too expensive
When there are no packing slips
When the shipment is delivered late
when there are dented cans
Answer:
When there are dented cans.
Explanation:
Dented cans cannot protect food. People should not consume products that come in dented cans, since these cans are formed by layers of metallic materials and / or coatings inside, which due to a blow can break and their ability to protect and preserve the content would be lost , having as a consequence the possible contamination by microorganisms.
Why should extra precautions against sun exposure be taken when boating?
Answer:
Use good lotions that will protect your skin from the sun’s Ultraviolet rays. Good clothing, such as wide-brimmed hats, can help protect your skin. Drinking plenty of water keeps your skin hydrated and helps prevent it from becoming dried out. UV rays can also harm your eyes, so wear UV protective sunglasses.The sun is less powerful in the morning and late in the day when it’s not directly overhead.Explanation:
How is biotechnology being used in the fields of medicine, forensics, or agriculture? Choose ALL that apply.
A) Gel electrophoresis is used for the separation and analysis of DNA, RNA and proteins, based on their size and charge.
B) In the future, scientists hope gene therapy will allow doctors to treat a genetic disorder by inserting a gene into a patient's cells instead of using drugs or surgery.
C) DNA sequencing may be used along with DNA profiling methods for forensic identification and paternity testing.
D) Gene therapy is currently being used to correct genetic mutations by inserting functional genes in their place.
E) Therapeutic cloning could allow an individual's own cells to be used to treat or cure that person's disease, without risk of introducing foreign cells that may be rejected.
Answer:
A,C,and E
Explanation:
Therapeutics, diagnostics, genetically modified crops for agriculture, processed foods, bioremediation, waste management, and energy generation are just a few of the uses for biotechnology, hence option a, c, and e is correct.
What is biotechnology?The most well-known use of biotechnology is the use of genetic engineering to produce therapeutic proteins and other medications.
Mass-producing insulin, human growth hormones, follistim (to treat infertility), human albumin, monoclonal antibodies, antihemophilic factors, vaccinations, and several more medications have all been made via genetic engineering in medicine.
Therefore, in a scientific study, creatures are genetically modified to learn how certain genes operate, hence options a, c, and e are correct.
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Look at the image of a plant. (image below)
Which tropisms are best illustrated?
A phototropism and positive gravitropism
B positive gravitropism and hydrotropism
C hydrotropism and thigmotropism
D thigmotropism and phototropism
Answer:
D
Explanation:
The little sprouts look like they are spiraling around the trunk and leaning towards the sun.
Answer:
D
Explanation:
Which statements are true for a protein whose genetic sequence has 11 codons?
Select all that apply.
1.) It starts with an arginine amino acid.
2.)One start codon and one stop codon are used for its synthesis.
3.)The piece of genetic code used for its production contains 11 codons.
4.)The stop codon codes for methionine.
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Answer: 1, 3, and 2
Explanation:
Final answer:
Out of the statements provided, it is true that one start codon and one stop codon are used in protein synthesis, and the piece of genetic code for production contains 11 codons. The start codon usually codes for methionine, not arginine, and the stop codon does not code for methionine. (options 2 and 3)
Explanation:
In considering a protein whose genetic sequence has 11 codons, several statements can be evaluated for accuracy. The protein synthesis process begins with an initiation codon and ends with a stop codon.
This means for a protein comprised of 11 codons, one of these is the start codon and typically one is the stop codon.
False. It is not guaranteed to start with an arginine amino acid; it usually starts with methionine due to the initiation codon AUG. True. One start codon and one stop codon are indeed used for its synthesis. True. The piece of genetic code used for production contains 11 codons which include the start and stop codons. False. The stop codon does not code for an amino acid, and specifically, it does not code for methionine. Methionine is coded by the start codon AUG.amino acids are used to build
Answer: proteins
Explanation: Amino acids are the building blocks or monomeric units of proteins. There are twenty naturally occurring amino acids. These amino acids are joined by peptide bonds to form polypeptide chains. During protein synthesis, the genetic code on the mRNA is read by the ribosome and the amino acid it codes for is fetched from the cytosol by the tRNA and used to make a polypeptide chain which then undergoes posttranslational modifications to form proteins.
Amino acids are used to build proteins. In living things, proteins play a number of different roles since they are substantial, complicated molecules. In addition to supporting structural functions, enzymatic activity, transport, and communication, they also participate in a variety of other biological activities.
An extended chain of amino acids called a protein is made up of these amino acid chains and peptide bonds. 20 different amino acids, each with a distinct side chain, are often found in proteins. The shape and function of a protein are governed by the particular amino acid sequence of the protein.
In order to produce a messenger RNA (mRNA) molecule, which is used by cells to manufacture proteins, transcription is the process by which a cell uses genetic information encoded in DNA to create a molecule of mRNA. A process known as translation is subsequently used to convert the mRNA molecule into a series of amino acids.
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A student added a solution to the plant cell shown in image 1 which resulted in the plant cell undergoing changes, as shown in image 2. What best directly explains the observed changes? A) The solution was isotonic to the cell and caused organelle lysis. B) The solution contained enzymes that degraded the DNA and proteins of the plant cell. C) The solution was hypotonic to the cell and caused an increase in turgor pressure as water entered the cell. D) The solution was hypertonic to the cell and caused water to leave the plant cells central vacuole and cytoplasm.
Answer:The answer is D
Explanation:
The statement that explains the observed changes in the plant cell is the solution was hypertonic, causing water to leave the central vacuole and cytoplasm of the plant cell. (Option D).
What is the observed changes in the plant cell?The observed changes in the plant cell can be explained by option D. The solution was hypertonic to the cell and caused water to leave the plant cell's central vacuole and cytoplasm.
In a hypertonic solution, plant cells lose water, resulting in plasmolysis - the shrinkage of the plasma membrane.
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The missing diagram is in the image attached.
What are several adaptations that leaves have undergone? Why do leaves have adaptations in different parts of the world?
Explanation:
example= leaves of plants, in Africa, point downward because Africa gets little rain if any. the leaves point downward because it directs the rain to the root of plant.
so, parts of the world, like rainforest, leaves are shaped like "cups" that animals that live in trees, can drink the h2o from leaves, Instead of leaving their habitats. if they were 2 travel downwards, preditors lurk,(snakes, chimpanzees, etc...) would be preditors...
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Is a cheetahs speed considered genetic variation? If so, what mechanisms would explain this variation?
Yes the speed of cheetah is considered a genetic variation.
Explanation:
A cheetah named Chewbaaka's genome has been sequenced and found that 11 genes have undergone mutations over generations to provide the speed to cheetah.
The changes in genes over a period of time in several generations caused genetic variation in the cheetah and natural selection leading to its evolution to fast runner.
You hear on the news that a volcano erupted in the
Pacific Northwest. You did not hear all the details, but
the reporter mentioned it was one of the most explosive
eruptions in the history of the United States. The
broadcast shows a massive cloud of smoke and ash
towering above a large volcano with steep sides.
Based on the evidence presented in the broadcast, what
type of volcano is most likely responsible for the
eruption?
A
cinder cone
B
composite
C
shield
Composite volcano erupts with massive cloud of smoke and ash towering above a large volcano with steep sides.
Explanation:
A volcanic terrain composed of slowly accumulated lava erupts out to the earth’s surface through vents or openings. Depending upon the type of vent and the flow of lava, volcanoes are classified into four basic types – Cinder cone, Composite, Shield, and Lava dome volcanoes.
A Composite volcano, also called Stratovolcano, arise from grandest large mountains. These mountains usually are tall with sides being even but steep.
These mountains are built by several layers of a repeated lava flow, cinders, volcanic ash, blocks and other volcanic material.
Due to these volcanoes arising from tall mountains, these can erupt and rise to great height to even above 8,000 feet from their surroundings.
Most of the tall mountains of the world like Mt. Rainier, Mt. Hood, Mt. Shasta, Mt. St. Helen in the USA, Mt. Cotopaxi in Ecuador, and Mt. Fuji in Japan are all composite volcanoes .
Analyze the Rate of Radioactive Decay
Suppose you could watch radioactive atoms decay. It would probably get quite boring as time went by.
Why? Check all that apply.
The initial decay rate is very fast, but the decay rate decreases over time.
Due to randomness, the last couple of radioactive atoms may take a long time before they become
nonradioactive.
The pattern becomes very predictable.
Only a few radioactive nuclei are left to decay, so fewer and fewer atoms decay.
The rate of the decay decreases with each half-life cycle.
The probability that an atom will decay is reduced with each half-life cycle.
Answer:
1. The initial decay rate is very fast, but the decay rate decreases over time.
2. Due to randomness, the last couple of radioactive atoms may take a long time before they become nonradioactive.
3. The pattern becomes very predictable.
4. Only a few radioactive nuclei are left to decay, so fewer and fewer atoms decay.
5. The rate of the decay decreases with each half-life cycle.
hope it helps!
Answer:
1-5
Explanation:
Are the correct asnwers
what would happen to most of life on earth if photosynthesis stopped
Answer:
If photosynthesis stopped, most living organisms on Planet Earth, including humans, would die due either (A) to a shortage of energy because no food molecules would be available or (B) to a shortage of oxygen for cellular respiration.
Answer:
That's because for photosynthesis to cease to exist, Earth would have to plunge into darkness. ... Whether the culprit were too much sunlight or not enough, if photosynthesis stopped, plants would stop converting carbon dioxide -- an air pollutant -- to organic material.
Explanation:
Most protists are unicellular microscopic organisms including amoebas and diatoms. Why are organisms like this so important for ocean environments ?
Explanation:
They form the base of the food chains/ webs for the marine ecosystems. These microorganisms are the most abundant in the oceans. They are preyed on by the small fish and the small fish are later preyed in by bigger fishes and so on..These micro-organisms are therefore critical in nutrient cycling in the oceans. Without them, there would be dead zones in the oceans.
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Protists, including amoebas and diatoms, play essential roles in ocean environments as primary producers, food sources, symbionts, and decomposers, contributing significantly to oceanic biodiversity, food webs, nutrient cycles, and ecosystems.
Explanation:Protists, such as amoebas and diatoms which are mostly microscopic and unicellular, play vital roles in ocean environments. They are primary producers and an important part of the food chain, serving as a source of nutrition for a variety of organisms. They contribute to approximately one-quarter of the world's photosynthesis, in particular dinoflagellates, diatoms, and multicellular algae.
Protists are also involved in symbiotic relationships, contributing to the health and survival of other species. For instance, the photosynthetic dinoflagellates known as zooxanthellae supply their energy to coral polyps that provide them with protection and nutrients; this relationship is critical to the formation of coral reefs. The loss of these symbionts leads to coral bleaching and the eventual death of the corals, illustrating the key participation of protists in preserving oceanic ecosystems.
Furthermore, protists are critical in nutrient cycles as they assist in decomposition and recycling of nutrients in marine environments. Collectively, these aspects reveal the indispensable role of these protists in maintaining the health and balance of ocean ecosystems.
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Explain the value or importance of using to International System of Units when describing motion. Provide an example that supports your reasoning.
The International System of Units is used just for convenience and easy communication of these scientific units.
Explanation:
International unit system is the modern system of units used to measure quantities like length(m), speed (m/s), mass (kg), temperature ( Kelvin), etc. is makes easier for people from different countries to understand.If we take the example of motion, where it is measured in meters as per International unit system if you like to say that I moved 4 m away from the chair. People who have an idea on what is a meter can only make a sense of what he says. Hence, there is a need for an International System of Units to make sense of measurable scientific quantities to people from different countries.which tissues in plants is similar in function to the circulatory system in humans ?
Discuss the potential effect on the biosphere if diatoms were prevented from storing their food as oil.
Answer:
It would prevent them from receiving sunlight and, therefore, to produce photosynthesis, affecting the amount of atmospheric oxygen and disrupting the food web.
Explanation:
Diatoms are a group of microalgae that are important components of phytoplankton, which produce almost half of atmospheric oxygen and are the base of the marine food web.
If diatoms weren't able to store their food as oil, it would prevent them from receiving sunlight and, therefore, to produce photosynthesis as the oil enables them to float in the sea surface. This situation would have detrimental impacts on the food web because, as primary producers, they are fundamental organisms that not only provide oxygen for the marine ecosystem and the atmosphere but they also serve as food for zooplankton, which are then eaten by bigger and important organisms.
If you could hsow the steps and walk me through it that would be very appreciated!!
Among a particular population of 100 plants, red flowers are dominant and yellow flowers are recessive. F is the dominant allele and f is the recessive allele.
40 plants are homozygous dominant
44 plants are heterozygous
16 plants are homozygous recessive
Use the Hardy-Weinberg equation to calculate the equilibrium frequencies of each genotype.
Answer:
The genotype of the homozygous dominant will be FF, and the total number of F alleles will be 40 × 2 = 80.
The genotype of the heterozygous plant types will be Ff. There will be 44 F alleles and 44 f alleles.
The genotype of the homozygous recessive will be ff, and the total number of f alleles will be 16 × 2 = 32.
Now the total number of alleles is 200 [(40 × 2) + 44 + 44 + (16 × 2)].
The frequency T of F allele will be .
The frequency t of f allele will be .
Now the frequency of the genotypes is represented by the equation p2+2pq+q2 = 1.
So, (0.62 × 0.62) + 2(0.62 × 0.38) + (0.38 × 0.38) = 1.Or (0.3844) + (0.4712) + (0.1444) = 1.
So, homozygous dominant frequency is 0.3844;heterozygous dominant frequency is 0.4712; and homozygous recessive frequency is 0.1444.
3. Photosynthetic organisms are usually
O producers
decomposers
O chemotrophs
heterotrophs
Answer: Producers
Explanation: Photosynthetic organisms use the green pigment called chlorophyll to manufacture their own food in the presence of sunlight, carbon dioxide and water. These organisms are called producers or autotrophs.
Electrical energy can produce many other types of energy.
When electricity runs through an electric stove, what other type of energy is produced?
A.
mechanical energy
B.
chemical energy
C.
heat energy
D.
sound energy
Answer:
Heat energy is the answer
Explanation:
I hope that answers your question.
Unit Test
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Active
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TIME REMAINING
01:19:50
Which type of scientific statement is defined as a statement of fact that is generally accepted to be true and universal because
it has always been observed to be true?
theory
probability
law
hypothesis
The type of scientific statement that is defined as a statement of fact that is generally accepted to be true and universal because it has always been observed to be true is a law, which is the third option.
What is the scientific law?In science, a law is a statement of a universal pattern or regularity that describes an observed phenomenon in nature. Laws are typically based on repeated observations or experiments and are considered factual and reliable because they have been observed to be true in all known cases. Laws do not explain why a phenomenon occurs but rather describe what happens when certain conditions are present.
Hence, a scientific statement that is defined as a statement of fact that is generally accepted to be true and universal because it has always been observed to be true is a law, which is the third option.
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Pointing your toes like a ballerina is an example of plantar flexion.
A.
True
B.
False
Answer: The answer would be A
Explanation: Plantar Flexion is whenever you are bending your foot in a type of way. In ballerina you have to bending, or flexing your foot, this also known as plantar flexion, so the answer would be true.
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Yes, pointing your toes like a ballerina is an example of plantar flexion. This is when the top of the foot points away from the leg.
Explanation:The statement given is
true
. Pointing your toes like a ballerina is indeed an example of
plantar flexion
. In medical terms, plantar flexion is a movement in which the top of your foot points away from your leg. When a ballerina points their toes, they are extending their foot in such a way that it's moving away from their leg which is the same action as plantar flexion. This is a common movement in ballet and other forms of dance.
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Molecules of dna are composed of long chains of
When is mitosis complete
when cells are grown in a laboratory, which factor can stop normal cells from dividing
Examine the results of an experiment above discussing how temperature affects cellular respiration. Identify the temperature at which oxygen levels would be predictably lowest and explain why.
Answer:
Option D
Explanation:
Options for the given questions are
A) 4 °C because this is where the glucose is in its most solid form, and oxygen is lost at its greatest rate at this temperature.
B) 30 °C because this is the average temperature for yeasts outside of the laboratory, and oxygen saturation is highest at mid-range temperatures.
C) 30 °C because this is where glucose is converted more easily into starches, and oxygen is consumed during cellular respiration.
D) 50 °C because this is the optimal temperature for enzymes responsible for cellular respiration, and oxygen is consumed during cellular respiration.
Solution-
As we are aware of this fact that dissolution of oxygen reduces with increase in the temperature of water. The warmer the water body is, the lesser will be the amount of oxygen. However, as the pressure increases the oxygen dissolution increases.
Now at 50 degree Celsius, the least oxygen will be dissolved . While on the other hand the oxygen content starts depleting because of its consumption by aquatic animals.
Hence, Option D is correct
How to get a girl that wont leave me
Just be yourself
Explanation:
Be confident in yourself as well as being honest.
Samira watched a demonstration in which a scientist combined two substances in a sealed container and analyzed the results. The ending substances did not look the same as the starting substances. Samira was given a diagram with the repeating groups of atoms that make up the starting substances, plus information about the properties of the starting and ending substances. She created a model of the repeating groups of atoms that might make up the two ending substances. Does her model correctly show why the properties of the ending substances are different from the properties of the starting substances? Describe what could be correct or incorrect about her model.
Answer:
Samira's model correctly demonstrates how the properties changed with the rearrangement of the atoms. However not all atoms are accounted for. There is a missing reactant.
Explanation:
Samira's model correctly demonstrated how the atoms in two compounds reacted to form two new products. However, the elements present in the reactants side should be the elements that make up the new products in the product side. But as the diagram shows, Sameera has mistakenly added a new element to one of her products which will be wrong.
She correctly demonstrates how the properties changed with the rearrangement of the atoms but not all atoms are accounted for which signifies a missing reactant.
What is a Reactant?These are referred to the starting materials which take part in a chemical reaction.
The elements on the reactant and product should be the same and the absence in the diagram depicts addition of new element which isn't ideal.
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A maglev train uses powerful magnets to lift the train above the tracks as it moves forward. Such a design reduces what following force.
A rolling friction
B gravity
C air resistance
D fluid friction
A. Rolling Friction
Explanation:
Maglev is train transportation that uses magnets. Maglev will have two sets of magnets, the function of the first set of the magnet is to repel and push the train and lift the train from the track and the function of the second set of the magnet is to elevate the train further. In this process, the lack of friction is the main advantage.Guideway is the magnetic coil running along the track and it repelling the big magnets present on the undercarriage of the train. This repulsion causes the train to go up by 1 to 10 centimetres above from the guideway. All the maglev trains are floating on the magnetic cushion and it reduces the rolling friction.Answer:
They use magnets
Explanation:
Describe three rolls a paleontologist performs in their job
Answer: They discover fossils, learn about the history of the earth and evolution of species.
Explanation:
The cells of your body need energy to carry out life functions. Which of the following body responses is a sign that your cells need more energy?
The cells of your body signal their need for more energy by becoming lethargic, breaking down stored energy, and increasing blood oxygen levels. These responses are aimed at producing more ATP, a compound fundamental to energy storage and release in the cell. Energy from ATP is used to perform various cellular activities, indicating the continuous need of cells for energy.
Explanation:The cells of your body demonstrate their need for more energy through specific responses. These behaviors can include becoming lethargic to conserve heat, breaking down stored energy, and significantly increasing blood oxygen levels. These responses align with the body's necessity to produce adenosine triphosphate (ATP), which is an essential compound for energy storage and release in cellular activities.
ATP drives all bodily functions — from contracting muscles to absorbing food in the gastrointestinal tract. It is created when carbohydrates are metabolically broken down into glucose. This breakdown provides what cells need to function properly, from ensuring nerve cell electrical potential to contracting muscles to absorbing food.
Living organisms have evolved to efficiently transform and transfer environmental energy into usable energy for cellular activity. For instance, energy stored within organic molecules such as sugars and fats is converted through biological chemical reactions into energy stored within ATP molecules. These energy-rich ATP molecules then fuel cellular activities, including the building of complex molecules, the transport of materials, and the powering of muscular contractions or cellular reproduction.
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