Answer:
older rock would have returned to the mantle through subduction
Explanation:
The reason why the ocean floor is only 180 million years old even though the oceans exist much longer then that on Earth, is because of the movement of the tectonic plates, a process through which the oceanic plates are getting subducted and melted into the mantle. The oceans that have existed prior to the ones that exist today haven't really left significant traces of their crust behind them. The reason for this is that the oceanic plates over which these oceans were got below the continental plates, thus got subducted. As they got subducted, they got destroyed in the mantle. The oceanic crust that we have nowadays is only 180 million years old, but as the time passes, the older oceanic crust will face the same destiny, and there will constantly be new one replacing it.
All rock on the ocean floor is less than 180 million years old due to the process of subduction. When oceanic plates collide, the denser one is forced beneath into the mantle, where it's recycled into new rock. Thus, the seafloor never gets too old as it's frequently replenished.
Explanation:All rock on the ocean floor is less than 180 million years old because older rock would have returned to the mantle through subduction. When discussing the age of the ocean floor, it's crucial to consider the process of plate tectonics, specifically subduction zones. The Earth's lithosphere is divided into several large and small pieces known as tectonic plates. These plates are in constant motion, and when an oceanic plate collides with another oceanic or continental plate, the denser one is forced under the less dense one. This process is known as subduction. As the plate is forced into the mantle, it melts and is recycled into new rock. This ensures that the seafloor does not get too old because it's continually being replenished with new rock pushed up from spreading centers, where new oceanic crust is created.
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10. Which criterion is not used to describe a mass movement event?
A. The angle of the slope
B. The type of material that failed
C. The rate at which the movement occurred
D. The motion of the failure
your answer is:
B. The angle of the slope.
Answer: The angle of the dangle
Explanation:
Which best describes a gamete?
A. a tetrad
B. a chromatid
C. a haploid cell
D. a diploid cell
A haploid cell describes a gamete. Therefore, the correct statement is option C.
What is a gamete?A gamete is a reproductive cell that is produced in the ovaries or testes of sexually reproducing organisms. These are specialized cells that form a zygote during fertilization leading to the development of a new individual.
Gametes are haploid as they contain only one set of chromosomes. The gametes are produced through meiosis, which involves two rounds of cell division. During meiosis, the chromosome number is reduced from diploid to haploid through homologous chromosome pairing, crossing over, and separation. A gamete is a haploid cell that combines with another gamete during fertilization to form a diploid zygote.
However, a tetrad refers to a structure of four chromatids, and a chromatid, on the other hand, refers to one of the two identical copies of a replicated chromosome connecting at the centromere.
Therefore, a gamete is a haploid cell that plays a very important role in sexual reproduction.
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Genetic drift, where allele frequencies randomly change over time, is strongest in Populations. A. Predatory. B.migratory. C. Large. D. Small
Answer:
The correct answer is option D- Small population.
Explanation:
Genetic drift is a random process which changes the allele frequency of a population in a short period of time. This change in allele frequency causes evolution and the allele frequency change can either decrease or increase over time.
This process is generally affected by the population size as a small population will have large sampling error which will have the strongest changes in allele frequency and alleles will have a greater chance of loss.
Thus, option D- Small population is the correct answer.
Answer:
The correct answer is option D, that is, small.
Explanation:
A phenomenon in which the frequencies of alleles within a population get alter by chance alone as an outcome of sampling error from generation to generation is termed as genetic drift. It is a random process, which can result in huge modifications in populations over a short time duration.
This random drift is a result of repeated small population sizes, extreme decline in the size of the population known as founder events and bottlenecks where a novel population emerges from a small number of individuals. The genetic drift results in the fixation of genotypes or alleles in the populations.
How is the male reproductive system different from other body systems?
It isn’t necessary to vital signs.
It monitors other body systems, and adjusts if necessary.
It transports items from one system to another.
It is the only system that produces hormones in the male.
Hello There!
The question you asked is how is the male reproductive system different from other body systems?
The answer is "It isn’t necessary to vital signs."
unlike other body systems, the male reproductive system is not essential for the life of a living organism.
Answer:
A. It isn't necessary to vital signs.
Explanation:
The Male Reproductive System is made up of internal and external organs. They undergo a slow maturation ending in puberty, that is, when the sex cells are available to originate another being. This system differs from other systems in the body because it does not need vital signs.
The organs that make up the male reproductive system are: urethra, penis, seminal vesicle, prostate, vas deferens, epididymis and testicles.
Question 2 of 10
2 Points
Scientists know that some methods used to increase the food supply are
dangerous to humans. Which method is known to be harmful to human
health?
O
O
O
A. Using genetically engineered crops
B. Spreading pesticides with planes
C. Increasing the number of vertical farms
O
D. Increasing the number of rural farms
Answer: B spreading pesticides
Explanation:
Pesticides can be harmful to humans if consumed and can also alter ecosystems by killing insects that are relied on as a food source by animals and pollinators by plants.
____ are macromolecules that are always non-polar
A. Water
B. Carbohydrates
C. Lipids
D. Proteins
Final answer:
Lipids are always non-polar macromolecules consisting of fats, oils, waxes, phospholipids, and steroids, and are known for their hydrophobic properties. They differ from other macromolecules like proteins and carbohydrates, especially in their role in biological systems such as forming the myelin sheath in the nervous system.
Explanation:
Lipids are macromolecules that are always non-polar. These include various fats, oils, waxes, phospholipids, and steroids. Lipids are known for being hydrophobic, which means they do not mix with water. In contrast, molecules like carbohydrates (which include substances such as cellulose and starch that are polysaccharides) and proteins can have polar characteristics. Also, unlike nucleic acids and proteins, lipids are generally not considered to be antigenic because they do not trigger an immune response as effectively.
It's worth noting that water is not a macromolecule but rather a polar molecule essential for life, and it's not organic. Moreover, some molecules like proteins can be amphipathic, meaning they have both polar and nonpolar regions, thus allowing them to interact with a variety of substances.
Within the nervous system, myelin, which is the insulating layer around nerves, is primarily composed of lipids and proteins. The interaction of these two types of macromolecules contributes to the efficient transmission of nerve impulses.
Which of the following is a limitation of a clinical trial?
A.)amount of random assignments
B.)hospital cost
C.)number of test tubes
D.)amount of peer review
option a.
The significant limitation of a clinical trial mentioned in the provided choices is the amount of random assignments. This relates to the sample size of the trial and the ability to accurately represent the population. The other options, hospital costs, number of test tubes, and amount of peer review are not intrinsic limitations.
Explanation:One significant limitation of a clinical trial is the amount of random assignments (A). The process of a clinical trial entails randomly assigning participants to different groups such as the experimental group or placebo group. This random assignment is crucial to ensure the result's validity. However, if the trial's size is small, it might not accurately represent the larger population, leading to biased results.
Hospital costs (B) and the Number of test tubes (C) are not intrinsic limitations of a clinical trial. They are logistical and can vary depending on the specifics of the trial. Lastly, the amount of peer review (D) is not a limitation of a clinical trial. Peer review is part of the scientific process: it helps ensure the study's validity
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A limitation of a clinical trial can be the amount of random assignments, hospital cost, and the amount of peer review.
Explanation:A limitation of a clinical trial is the amount of random assignments. In a clinical trial, participants are randomly assigned to either the experimental group or the control group. However, due to logistical constraints or ethical considerations, it may be difficult to have a large number of participants in a trial or to randomize the assignment of participants.
Additionally, hospital costs can be a limitation of a clinical trial. Conducting a clinical trial often involves significant expenses, such as staff salaries, equipment, and data analysis. These costs can limit the number of participants and the duration of the trial.
Lastly, the amount of peer review can be a limitation. Clinical trials need to undergo rigorous peer review to ensure that the study methods, data analysis, and conclusions are valid and reliable. However, the availability of experts and the time required for peer review can sometimes create delays in the publication and evaluation of clinical trial results.
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92
Sathe best for the question
11. Most animals and plants reproduce sexually. This means that DNA is passed down to new organisms
from two parental organisms. Which of the following is a key advantage of sexual reproduction?
Answer:
Genetic Variation
Explanation:
The main advantage of sexual reproduction is genetic variation. Sexual reproduction is synonymous to fertilization which is the uniuon of a male and a female gamete. Each gamete carries genetic information from its source (mother/father), and when they go through sexual reproduction, the gametes will produce an off-spring that carries both genetic information. As a result, the off-spring will contain a different genetic make up as the parents.
Answer:
Increased genetic diversity for changing environments is a key advantage of sexual reproduction.
Explanation:
Most animals and plants reproduce sexually. This means that DNA is passed down to new organisms from two parental organisms. Increased genetic diversity for changing environments is a key advantage of sexual reproduction.
In the induced-fit model of enzymes, a substrate associates itself with which part of an enzyme?
A.
the denatured site
B.
the amino acid site
C.
the active site
How has technology been used to address issues related to sewage?
O
A. Sewage treatment plants use bacteria to clean water and solid
waste before releasing it into the environment.
O
B. Sewage treatment plants heat water to kill bacteria.
O
c. Sewage treatment plants use landfills to filter and clean water and
solid waste before releasing the water into the environment.
O
D. Sewage treatment plants cool water to kill bacteria.
Technology has been used to address sewage problems through treatment plants where bacteria clean water and solid waste, making it safer for discharge or reuse. Heating or cooling water to kill bacteria and using landfills for filtration are not common practices.
Explanation:Technology has played a crucial role in addressing issues related to sewage. One way is through sewage treatment facilities. At these plants, technology is used to mechanically, biologically, and chemically treat sewage to make it safe for disposal or reuse. For example, sewage treatment plants often use bacteria to clean water and solid waste. These bacteria digest the organic material in the sewage, which reduces the amount of solid waste and cleans the water. In the process, harmful pathogens are also significantly reduced, making the water safer for release into the environment. However, sewage treatment plants do not typically heat or cool the water to kill bacteria, as these methods are energy-intensive and less efficient. Additionally, sewage treatment plants do not usually use landfills to filter and clean water and solid waste, as landfills are primarily used for solid waste management and not water filtration or treatment.
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Which statement best describes enzymes?
(1) they slow down the rate of breathing
(2) they are the building blocks of polymers
(3) they speed up the conduction of impulses along a nerve cell
(4) they influence the rate of chemical reactions
1
Explanation:
I I don't know if it is the best but I know that it is true
A line graph has a vertical axis labeled "Average plant mass (g)" and a
horizontal axis labeled "Concentration of ammonium nitrate (mg/L)." What
information is conveyed by a point plotted with coordinates (10,40)? Keep in
mind coordinates are written as (x coordinate, y coordinate).
Answer:
Letter B.
Explanation:
Looking closely at the graph, we can see that on the X axis, the graph gives us the information of the ammonium nitrate concentration that the plant was exposed, in this case 10 mg/L. On the Y axis, the graph gives us the information of the average quantity in grams of the plant mass, in this case 40 grams. So the average plant mass exposed to 10 mg/L ammonium nitrate was 40 grams and the right answer is Letter B.
A point at (10,40) on the graph indicates that at a concentration of ammonium nitrate of 10 mg/L, the average plant mass is 40g.
Explanation:In the given line graph, the point with coordinates (10,40) conveys that when the concentration of ammonium nitrate is 10 mg/L, the average plant mass is 40g. The x-coordinate (10mg/L) refers to the concentration of ammonium nitrate being studied, while the y-coordinate (40g) indicates the corresponding average plant mass at that particular concentration.
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Which of the following processes begins when a star enters the main sequence?
Nuclear fission
Nuclear fusion
Condensation of a nebula
Appearance of a supernova
Hello there Jonnromeroo, thank you for asking a question here on Brainly!
You Asked ➤ Which of the following processes begins when a star enters the main sequence?
↴ OUR CHOICES ↴
A: Nuclear fission
B: Nuclear fusion
C: Condensation of a nebula
D: Appearance of a supernova
------------------------------------------------------------------------------------
Answer ➤ B: Nuclear fusion
Explanation: When a star begins the process of being created, it is hot and dense. Really hot and dense! It begins to start fusing with helium which is the start of its main sequence called nuclear fusion.
I hope this answer is helpful to you, but please let me know if you have any other questions regarding it.
- Qamar
Answer:
Nuclear fusion is a correct option
Explanation:
Nuclear fusion processes begin when the star enters the main sequence.
Nuclear fusion: by which energy is produced by the star,the star become the main sequence star and it gets turned on.
Formation of a star takes place when it is very hot, hydrogen atom fuse to form helium in the core region,and energy is released by the fusion process and star enters the main sequence by the processes nuclear fusion.
This fusion results in outward pressure which balances the inward pressure, which is caused by gravity and thus stabilizes the star.
Thus Nuclear fusion processes begins when a star enters the main sequence.
Your best friend told you that last week they discovered that there is a new galaxy very similar to ours. Which do you think is BEST way to research this recent discovery?
your best friend’s parents
an encyclopedia
NASA’s internet site
a book in the library
Nasa because they have more tools and are better equiped and trained to find galaxies than anyone .
NASA’s internet site is The National Aeronautics and Space Administration is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research.
What is NASA website built with?Mobomo developed the www.nasa.gov headless Drupal, AWS cloud environment with security, performance, and availability in mind.
It is architected in a manner that separates the content management portal from the public website infrastructure to provide maximum security.
What is NASA's purpose?Our more than 18,000 professionals come from many diverse backgrounds, but are united by a common purpose: to pioneer the future in space exploration, scientific discovery and aeronautics research. In addition to our core values, our NASA team embodies a few shared characteristics that are integral to our success
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What limitations were placed on the presidency by
the Twenty-Second Amendment? Check all of the
boxes that apply.
Presidents could only be elected to office
twice.
Presidents could no longer choose vice
presidents as running mates.
Presidents could only serve for a maximum
of ten years.
Presidents could only be elected after serving
in Congre As.
Answer: A) Presidents could only be elected to office twice.
Explanation:
The 22nd Amendment states
"No person shall be elected to the office of the President more than twice, and no person who has held the office of President, or acted as President, for more than two years of a term to which some other person was elected President shall be elected to the office of the President more than once."This Amendment was passed in 1951 as a direct result of President Franklin D. Roosevelt serving four terms as President of the United States.
How can active reading strategies help you?
O
A. They can help you get into better physical shape.
O
B. They can help you read fewer science articles.
O
c. They can help you understand what you read.
O
D. They can help you avoid reading altogether.
answer C. they can help you understand what you read.
Which phrase is the best summary of the model shown?
A. The transfer of the sun's energy through trophic levels
B. A series of aerobic and anaerobic reactions
C. A transformation of light energy into chemical energy
D. The breakdown of food molecules
Plants that we recognize today spend the majority of their life in the A. haploid phase. B. gametophyte phase. C. seed phase. D. diploid phase
Answer:
The correct answer is D: diploid phase
Explanation:
The essence of plant life is their characteristic property of alternation of generations. Each plant undergoes alternation of generations and produces haploid and diploid generations.
This property allows the plant to reproduce both sexually and asexually. Primitive plant species used to reproduce through spores and spent the majority of their life as haploid cells. These cells were called as spores and required only matter and energy to reproduce.
Modern plant species reproduce by using gametes and spent the majority of their life in diploid phase called diploid sporophytes.
Answer: D diploid phase
Explanation:
Eutrophication is caused by___
Answer:
Eutrophication can be defined the process by which the there is a significant increase in the population of algal growth.
This increase in the algal growth is due to the increase in the phosphorous and nitrogen in the water bodies.
The phosphorous increases the growth of algae in the nearby water bodies and depletes the oxygen level in water bodies.
So, Eutrophication is caused by excess of fertilizer(phosphorous) in water.
What is 25 m rounded to one significant figure?
Answer:
20
Explanation:
Which statement describes the impact of ocean currents on climate
Answer:
Ocean currents create changes in the temperature of air over land masses
Explanation:
Oceans capture a lot of heat from the sun than land. This is because water has a very high heat capacity. This heat becomes distributed across the globe through oceans currents. The water vapor that evaporates from the oceans heats up the atmosphere creating low-pressure systems. These create winds that blow up the heat and moisture over land creating rain/precipitation. This influences climatic systems across the globe.
Answer:
B:Ocean currents cause the temperature of air over large bodies of water to change.
Explanation:
1 Point
Which of the following best describes the goal of technology?
O
A. To improve the economy
O
B. To apply scientific knowledge to ethical decision making
O
C. To use scientific knowledge to solve problems or to make tasks
easier
O
D. To make more industrial jobs
SUBM
Answer:
B
Explanation:
To apply scientific knowledge
The following best describes the goal of technology - C. To use scientific knowledge to solve problems or to make tasks easier.
TechnologyIt is the system or device of the result of scientific knowledge for a practical purpose or to solve any problem. Scientific knowledge is used to solve any problem using various steps of experiments.
In daily life, scientific knowledge is used to make tasks easier with the help of technology is used science in a way that can help people in solving problems.
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What links the two strands in a DNA helix together in the middle?
A. Phosphate groups
B. Sugar rings bonded together
C. Proteins
D. Bases with hydrogen bonds
Hydrogen bond links the two strands in a DNA helix together in the middle.
Who made model of DNA structure?Watson and Crick made the first model of the DNA molecule based on its X-ray picture, made by Rosalind Franklin. The model explained that the DNA molecule has the shape of helix. It is composed out of two antiparallel strands, interconnected with weak, hydrogen bonds.
Hydrogen bonds occur between the two strands and involve a base from one strand with a base from the second in complementary pairing.
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What is a substrate?
Answer:
A substrate is a molecule acted upon by an enzyme. A substrate is loaded into the active site of the enzyme, or the place that allows weak bonds to be formed between the two molecules. An enzyme substrate complex is formed, and the forces exerted on the substrate by the enzyme cause it to react, and become the product of the intended reaction. The bonds that form between the substrate and enzyme cause the confrontational change, or shape change, in the enzyme. The resulting shape change is what applies pressure to the substrate, either forcing molecules together or tearing them apart.
what type of rock is most likely to form in an earthquake zone
A metamorphic rock is most likely to form in an earthquake zone.
Which of the following is likely NOT involved in this example of ecological succession?
A) The rotting remains of plants add to the fertility of the soil.
B)The soil becomes so fertile that eel grass is replaced by other plant
species.
C) The roots from plants help stabilize the sediment, keeping it in place.
D) The concentration of salt becomes so high that all plant life is destroyed.
If I am correct you answer will be
D) The concentration of salt becomes so high that all plant life is destroyed.
hope this helps
Ecological succession involves the gradual replacement of eel grass by other plant species as the soil becomes more fertile. The concentration of salt becoming too high is likely NOT involved in this example.
Explanation:The correct answer is D) The concentration of salt becomes so high that all plant life is destroyed. Ecological succession is the process of gradual change in the species composition of a given area over time. In this example, ecological succession involves the gradual replacement of eel grass by other plant species as the soil becomes more fertile. The rotting remains of plants add to the soil fertility, and the roots from plants help stabilize the sediment. However, a concentration of salt that becomes too high can be detrimental to plant life and inhibit the growth of any plant species in the area.
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because copper is a metal,it is
Hello There!
Because copper is a metal, then it is conductive.
Answer:
it is a conductor, a conductor is basically anything that absorbs heat, so like, u make a soup and leave a metal spoon in there for a while, and u put the spoon in your mouth and get a third degree burn? yeah lol, or here's a better example, so a penny is made of copper, and if you find a lucky penny, on the floor, at 3:00 pm, and you touch it, it's gonna be h-o-t lol
A plant that lives in the canopy of the rainforest is planted on the forest floor. How might its
survival be affected? It would
A. no longer be able to get nutrients from soil
B. be able to break down plants to get
nutrients
C.not get as much sunlight for
photosynthesis
D. be able to survive with little available water
A plant that lives in the canopy of the rainforest would not get as much sunlight for photosynthesis.
How will the canopy effect the photosynthesis?The canopy refers to the dense ceiling of trees and their branches, whereas the understory refers to the more widely spaced, smaller tree species and young individuals that form a fragmented layer beneath the canopy.The interior is shielded from the canopy's extremes: temperature swings, harmful sun radiation, and powerful winds. The light is diffused and subdued, the humidity is higher and more consistent, and the lower canopy receives very little direct sunshine.hence the plant under the canopy would not get as much sunlight for photosynthesis.
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What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?
Answer:
Force of the expanding gases
Explanation:
What is the relative placement of the Moon, Earth and Sun during a lunar eclipse?
The Sun, Earth and Moon are aligned with the Earth in the middle and the Moon furthest away from the Sun.
The Moon and Sun are aligned with the Earth at right a right angle to the Moon.
The Sun, Earth and Moon are aligned with the Moon in the center and the Earth furthest away from the Sun.
The Earth and Sun are aligned with the Moon is at a right angle to Earth.
2.
Choose the best explanation of a partial solar eclipse.
During a new moon phase there is usually a partial but not total eclipse.
The Earth only partially covers the Sun during the eclipse.
The Moon only partially covers the Sun during the eclipse.The Moon only partially covers the Sun during the eclipse.
The Moon's phase is full and blocks out most but not all of the Sun.
3.
What are conditions necessary for a total solar eclipse?
Moon in perigee orbit, Earth a direct line between Sun and Moon, Moon in full moon phase
Moon in perigee orbit;Moon moves a direct line between Sun and Earth; Moon in full moon phase
Moon in perigee orbit; Moon moves a direct line between Sun and Earth; Moon in new moon phase
Moon in apogee orbit, Moon moves a direct line between Sun and Earth; Moon in new moon phase
4.
What causes a partial lunar eclipse?
Only the penumbra of the Earth passes across the Moon creating a circular shadow.
The Earth's umbra fits inside the Moon creating an illuminated ring known as a annular eclipse.
A partial eclipse causes the Moon to turn reddish from the refraction of the Sun's ray through the Earth atmosphere.
The Earth's umbra only cover a part of the Moon causing a circular shadow to pass across it.
The right answer to number four is
The Earth's umbra only cover a part of the Moon causing a circular shadow to pass across it.
A partial lunar eclipse happens when the Earth's umbra part moves across the Moon making a circular shadow across the Moon. An annular lunar eclipse is not possible because the Earth's umbra is always larger than surface of the Moon even if the orbits are in apogee.
For the following:
During a lunar eclipse, the Sun, Earth, and Moon are aligned, with the Earth in the middle.A partial solar eclipse occurs when the Moon only partially covers the Sun.A total solar eclipse occurs when the Moon is in perigee orbit, is moving directly in front of the Sun, and is in new moon phase.A partial lunar eclipse occurs when only part of the Moon passes through the Earth's umbra.What are the functions of eclipse?1. The Sun, Earth and Moon are aligned with the Earth in the middle and the Moon furthest away from the Sun.
During a lunar eclipse, the Earth casts its shadow on the Moon. This can only happen when the Sun, Earth, and Moon are aligned, with the Earth in the middle.
2. The Moon only partially covers the Sun during the eclipse.
During a partial solar eclipse, the Moon passes in front of the Sun, but does not completely block it out. This is because the Moon is smaller than the Sun.
3. Moon in perigee orbit; Moon moves a direct line between Sun and Earth; Moon in new moon phase.
During a total solar eclipse, the Moon completely blocks out the Sun. This can only happen when the Moon is in perigee orbit (its closest point to Earth), is moving directly in front of the Sun, and is in new moon phase (completely dark).
4. The Earth's umbra only cover a part of the Moon causing a circular shadow to pass across it.
During a partial lunar eclipse, only part of the Moon passes through the Earth's umbra (its darkest shadow). This causes a circular shadow to pass across the Moon.
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