Answer:
The 6th Mass Extinction is the current mass extinction event of the Holocene era.
The 6th extinction differs with the last five in terms of the cause. The last 5 extinction events all had natural causes, with species killed either by climate change or by natural disasters such as volcanic eruptions.
Explanation:
Before we elaborate the 6th extinction, it is important to understand the meaning of mass extinction and why it takes place.
Mass Extinction:
A mass extinction is a time period in which a large number of living species go extinct.
The Earth has gone through 5 major extinction events. Lets analyse how their cause differs from the 6th extinction.
The first extinction occurred in the The Ordovician Period of the Paleozoic Era (about 440 million years ago). The major cause of this event was continental drift and the climate change that followed. This extinction took place in 2 stages: an ice age that covered the Earth and the rising sea levels when the ice age ended. The second one occurred in The Devonian Period of the Paleozoic Era (about 375 million years ago). Many climatic changes are suspected to be causes of this event: Lack of oxygen in the oceans, quick cooling of air temperatures, volcanic eruptions, and meteor strikes.The third event took place in The Permian Period of the Paleozoic Era (about 250 million years ago). Asteroid strikes, volcanic activity and climate change are suspected to be the causes.The fourth extinction occurred at the end of the Triassic Period of the Mesozoic Era (about 200 million years ago). Volcanic activity, rising pH and salt concentrations in the oceans and climate change are said to be the primary causes.The fifth extinction occurred at the end of the Cretaceous Period of the Mesozoic Era (about 65 million years ago). Asteroid strikes or meteor showers are said to be the causes.The 6th extinction, occurring in the Holocene era, is believed to caused solely by human activities and the consequent climate change.Skulls of Homo sapiens were found during an excavation. The skulls were preserved because the bodies were frozen. So, these fossils are ( 1 ) fossils.
( 1 ) A. Mineralized
B. Mold
C. Original-tissue
Answer:
Option (C)
Explanation:
In the frozen areas the temperature remains relatively cold which favors the preservation of the original hard and the solid parts of the organisms. The body becomes frozen due to the low temperature, as a result of which the tissues are not completely replaced by any type of secondary minerals.
In the given condition, the skull of Homo sapiens that are found to be preserved under the frozen rock bodies, are found to contain the majority of the original body parts, for which it can be considered as the original-tissue fossils.
Hence, the correct answer is option (C).
Answer:
Skulls of Homosapiens were found during an excavation. The skulls were preserved because the bodies were frozen. So, these fossils are original-tissue fossils. The image shows the evolution of skulls beginning 2 to 3 million years ago. Based on the image, modern human skulls show similarities to ape skulls.
Explanation:
just took it on plato/edementum and got it correct:-) i hope this helps!
Many viruses are a protein coat surrounding
a segment of DNA. Because viruses are not
made of cells they are...
A. not considered to be living things.
B. able to reproduce very quickly.
C. better able to communicate with other viruses.
Which of the following is an example of sustainable development?
A. clear cutting
Cloverfishing
B. sustainable fishing
D. mountain top removal
The sustainable fishing is an example of sustainable development.
Explanation:
The sustainable development has its focus on sustainability, meaning that the area that is developed should be developed in a manner that will enable continuous production and availability of certain goods. This is done by undertaking certain measures, as the resources are not endless, so they have to be managed very carefully in order to be available year in year out. A good example of this is the sustainable fishing.
The sustainable fishing is performed in a manner that strictly regulates the amount of fish that is fished, in what period should the fishing go on, the size of the fish, as well as the species of fish. This results in leaving the fish to reproduce freely, always having high enough number for reproduction, releasing the young fish if caught, and having good supply of fish each year. This benefits the fish, the economy, the diet of the humans, and the well being of the environment.
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What two
scientist established the structure of DNA
Answer:
Francis Crick and James Watson
Explanation:
James Watson and Francis Crick established the structure of DNA in 1953. They used X-ray crystallography data collected by Rosalind Franklin to construct the double-helix model.
Explanation:The two scientists who established the structure of DNA were James Watson and Francis Crick. They made this groundbreaking discovery in 1953, which formed the basis for our understanding of genetics and heredity. Watson and Crick used X-ray crystallography data collected by Rosalind Franklin to construct the famous double-helix model of DNA.
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upon completion of a program at a vacational school students earn an
Answer:
certificate or license
Explanation:
Vocational schools more focused on work-related competencies so it has more technical courses and shorter duration than a university degree. Compared to the universities that tend to teach broader range of subjects The skills that are taught in vocational school tend to be really specific.
You won't get degree from a vocational school. Things such as Bachelor's degree typically only given to universities students who finished their program for around 3-7 years.
Why are there many separate ecosystems in a rainforest
Answer:
Because there are different conditions that support different organisms.
Explanation:
Which of the following is NOT a known side-effect of alcohol on hormonal balance?
Greater than the effect of each drug added together
Equal to the effect of each drug added together
Less than the effect of each drug added together
Answer:
Less than the effect of each drug added together.
Explanation:
1)Most of the food we eat can be influenced by whom?
2)Food choices come from what?
Answer:
1) Hunger, savor, appetite. Three main biological reasons why we eat. Also, the economic ability to pay for the food. And the fisical capability to go and buy food, to cook.
2) Our physiological needs are the main reason why we choose food. People need energy to survive.
Everyone would like to have the possibility to eat what he wants. But food choices depend on the financial situation, social class, and preferences.
That is why poor people or people who have less money to spend on food, often eat food that can feed more people but it doesn’t have nutritional values. When people have money, they immediately have a wider spectrum of groceries that can choose from.
Explanation:
Savour is equal to enjoying. When people are not hungry they are happier. We choose what to eat depending on the look, taste, smell, texture. As sweets smell good, people consider them the most attractive food. Food is not just the source of nutrition, it is also the source of satisfaction.
One’s natural predisposition to think and act in a certain way is one’s __________.
A.
learned habit
Answer:
It's D Temperament
Explanation:
Answer: Temperament
Explanation: 100% right. Just tested.
What is the brown structure embedded in the cell membrane? What is the function of this brown structure?
explain the Three position of Meristematic tissues
There are three types of meristems on the basis of position, i.e
Apical meristem.Lateral meristem.Intercalary meristem.Explanation:A meristem is the tissue present in most plants containing undifferentiated cells, found in zones of the plant where growth can take place. Generally differentiated cells(the cells other than meristems) do not divide and produce of a different type of cells.
Meristems are classified on the basis of their location in the plant:
Apical meristem - these are the meristems located at root and shoot tips of the plant. Lateral meristem - these are the meristems located in the vascular and cork cambia in plants. Intercalary meristems - these are the meristems located at internodes, or stem regions between the places at which leaves attach, and leaf bases.Result: There are 3 types of meristems.
What is an Intermolecular force
Inter-molecular force:
These are the force that helps in holding two covalent molecules together. It may be with forces of attraction or can be repulsion. E.g. atom or ions, ion induced dipole forces. It can be better understood by forces of attraction between the molecules of water. Here the intermolecular force helps in holding the hydrogen atom and oxygen atom of single water molecule. They are of four types, first one is
Ionic bond> hydrogen bond> dipole-dipole interaction > dispersion force.
Answer:
a) a force acting between two different molecules
Explanation:
a p e x :)
The greenhouse effect _______.
a.
is essential for life on Earth
b.
warms Earth’s atmosphere
c.
is a natural phenomenon
d.
all of the above
Answer is option d. all of the above
The greenhouse effect is a natural phenomenon that warms Earth's atmosphere. It is essential for life on Earth because it traps heat from the sun, which keeps the planet's temperature at a level that is suitable for life. Hence option D) all the above is correct.
The sun's rays hit Earth's atmosphere. Some of the rays are reflected back into space, but some are absorbed by gases in the atmosphere. The gases that absorb the rays, such as carbon dioxide, water vapor, and methane, trap the heat and keep it from escaping.
The trapped heat warms Earth's atmosphere and surface. Without the greenhouse effect, Earth's average temperature would be about -18 degrees Celsius (-0.4 degrees Fahrenheit). This is too cold for life to exist.
However, human activities are increasing the greenhouse effect by emitting more greenhouse gases into the atmosphere. This is causing the planet to warm, which is leading to climate change.
So, the greenhouse effect is essential for life on Earth, but it is also being affected by human activities. This is a cause for concern, as it could lead to more extreme weather events and rising sea levels.
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_________ is the ability to do work and allows living things to perform all the functions necessary to live.
Answer: Energy is the ability to do work and allows living things to perform all the functions necessary to live.
Energy is the ability to do work and is vital for life functions. It comes from food and is used by the body in various ways.
Explanation:The answer to this question is Energy. Energy is the ability to do work and allows living things to perform all the functions necessary to live. For example, human bodies use energy to move, to maintain body temperature, and to allow the brain to think and process information.
Energy comes in many forms, such as heat, light, chemical, and electrical. In biology, the energy we are talking about most often is biochemical energy, which is derived from nutrients in food. Through a process called cellular respiration, your body converts the food you eat into usable energy.
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Explain Earth’s gravity as it orbits the Sun.
Answer:
the Earth orbits the Sun because of the pull of the Sun's gravity. This happens because the Earth has a acceleration in the direction perpendicular to the force of the Sun's pull and if the Sun weren't there, the Earth would travel in a straight line.
Explanation:
Consider the stage of cellular respiration that is shown in the diagram. A diagram shows the conversion of a glucose molecule to 2 pyruvic acid molecules. In this process, 2 A T P form 2 A D P, 2 N A D produce 2 N A D H, and 4 A D P produce 4 A T P. What is the net ATP production at this stage of cellular respiration? 2 ATP 4 ATP 32 ATP 36 ATP
Answer:
2 ATP
Explanation:
Although we don't have the diagram, the stage of cellular respiration in which a glucose molecule is converted into 2 pyruvic acid molecules is glycolysis. A diagram showing the process is attached.
Have look at the ATPs involved in the reaction. You can see in the first stage there are 2 ATPs required to begin the reaction (the arrow points inwards). Then, in the second stage, in the conversion the 2 x 3C sugar phosphates, there are 2 ATPs released each.
So we have made 4 ATP, but we had to use 2 ATP, that means the net ATP production is 2 ATP (and the gross ATP production would be 4).
Answer:
the answer is 2 ATP on edg 2020
Explanation:
Which symbol in a chemical equation separates the reactants from the products?
11 T
AI +
Answer:
its B. the arrow
Explanation:
Why is it important for the chromosomes to condense during mitosis?
Question 2 options:
to facilitate DNA replication
to facilitate chromosome movement
to facilitate cytokinesis
to facilitate spindle formation
Answer:
It is important for the chromosomes to condense during mitosis to facilitate chromosome movement.
Explanation:
The chemical called colchicine is found to be used during the process of mitosis, so as to freeze the cells, which can stop or prevent the movement of the chromosomes. This process is also essential for the faithful genome replication or transmission to those daughter cells. During the interphase cell division occurs but during the prophase the cell condensation is found to be happening. Before the process of the mitosis chromosomes are allowed to move and during this entangled and breaking were also noticed.
Some people with spinal cord injuries do not sweat below the area of the injury. Without the ability to sweat, the
human body temperature begins to rise. Which statement would best describe this situation?
Feedback mechanisms regulate blood sugar levels.
Gene mutations are increased.
Energy from ATP is not available,
Dynamic equilibrium is disrupted,
Answer:
The dynamic equilibrium of the body is disrupted as a result of a spinal cord injury. So the answer is 'D'.
Explanation:
The whole body works on the command of the brain. The brain is responsible for sending messages to the body via the spinal cord. If there is any damage to the spinal cord the message will not reach the body.
Even, if the message goes to the spinal nerves, the message cannot climb back up. Also, the usual reflex movements are not under the control of the brain. A person with a spinal cord injury cannot sweat or even have goosebumps and as a result the temperature rises. The equilibrium of transmission and receiving back of the messages is disturbed.
Final answer:
The inability to sweat after a spinal cord injury disrupts an individual's homeostasis, specifically affecting the dynamic equilibrium necessary to regulate body temperature, which can lead to the body overheating.
Explanation:
Individuals with spinal cord injuries who do not sweat below the level of their injury face a disruption in their body’s thermoregulation system. Because sweating is a mechanism to dissipate excess heat, the inability to sweat disrupts homeostasis, specifically the dynamic equilibrium necessary for maintaining a stable internal environment. The correct description of this situation is that 'Dynamic equilibrium is disrupted.'
Homeostasis is generally maintained through a negative feedback loop involving a stimulus, sensor, control center, and effector. This system helps to regulate body temperature as well as blood glucose levels. When this feedback loop is disrupted due to a spinal cord injury, the body may not be able to effectively regulate its temperature, which can lead to overheating and potential health risks.
what would happen if we remove a producer from a food web?
Answer:
The Consumer who ate the Producer would die out.
Explanation:
Answer:
Every living organism will die.
Explanation:
Plants are the only organisms that can make their own food. The removal of producers would cause the entire food web to collapse. Primary consumers (herbivores), which feast on producers directly, would die off. Including us humans, since we get our food from the earth's soil, in other words, from plants. Secondary consumers (carnivores) are the next to be affected: they are the ones that eat primary consumers. Superior consumers would suffer as organisms of lower trophic levels begin to die off. Decomposers would break down corpses of dead animals, returning their fundamental components and composites to the environment. Nevertheless, even these dead organisms would run out, and the entire food web would collapse.
15. A disease causing agent was isolated from a human. Under the microscope, the disease causing agent is seen to be made up of a crystal-like outside. When these structures are exposed to a stain that turns blue in the presence of DNA, the middle of the structure turns blue. In the presence of living human cells, the crystal-like objects appear to increase in mass and become more numerous. In the absence of human cells or in the presence of dead cells, no changes are observed in the mass or number of crystal-like objects. [5pt] a. Using the criteria developed in class; determine whether the object is living or nonliving. b. Justify your answer. Be sure to examine each of the criteria.
I don't know how to do this, I need help!
Answer: disease causing agent is living
Explanation:
The disease-causing agent is likely nonliving, as it requires living human cells to increase in mass and number and shows no independent metabolic activity or reproduction. Its DNA content does not necessarily qualify it as a living organism since entities like viruses also contain genetic material but are considered nonliving.
Explanation:Answering whether the disease-causing agent is living or nonliving requires us to reference the characteristics of life, which usually include the ability to reproduce, grow, respond to stimuli, have an organized structure, metabolize, maintain homeostasis, and evolve over time. In the given scenario, the agent seems to be capable of replication or increasing its mass only in the presence of living human cells, suggesting that it may lack independent metabolism and reproduction, which are key characteristics of living organisms. Therefore:
The object is likely nonliving based on our criteria.Justifying our conclusion, the agent does not exhibit independent growth or reproduction, requiring living human cells to increase in mass and number. The crystal-like agent also does not change in the absence of living cells, which indicates it does not possess metabolic processes needed for life on its own.Moving back to the class criteria, the fact that it contains DNA (as evidenced by the stain turning blue in its presence) may initially suggest some sort of genetic information typical of living organisms, however, many nonliving entities such as viruses also contain genetic material but are not considered living because they cannot exist independently without a host cell. Therefore, the DNA presence isn't enough to classify it as living without other life characteristics.
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Which of the following best describes the process of transcription during protein synthesis?
A. to pair tRNA with mRNA
B. to deliver amino acids to the nucleus
C.to produce anticodons that will be delivered to the ribosome
D. to make an RNA copy of a gene's DNA sequence
Answer:
The answer is 'D'. Transcription is the process by which a single stranded mRNA is formed from the double stranded DNA.
Explanation:
The central machinery of biology involves three processes- replication, transcription and translation. The process by which DNA doubles itself is called replication. In translation, protein is formed from the messenger RNA or mRNA. The major steps involved in transcription are:
InitiationElongationTerminationIn the process of translation, amino acids bind together in the ribosome to form a polypeptide chain.
Answer:
D I think
Explanation:
Reena is suffering from high fever since night. Her aunt measures her body temperature to
39°C using a celcius thermometer. But she wants to know this temperature in Fahrenheit scale
before leaving for doctor's clinic. Help her to convert this temperature on fahrenheit
Answer:
82.2 °F
Explanation:
To convert from temperature from °C to °F
You need to multply C by 9/5 then add 32
39 × 9/5 + 32 = 82.2
Which would most likely result in low oxygen levels in the blood?
a) inheriting one sickle-cell allele
b) inheriting two sickle-cell alleles
c) inheriting one diabetes allele
d) inheriting two diabetes alleles
Answer:
yea it should be B
Explanation:
because the problems and or deformity in the blood cell prevents blood from carrying oxygen properly
When there is less oxygen levels in the blood so it should result in option b.
Sickle-cell alleles:
It should be found on a recessive allele with respect to the hemoglobin gene. The people who have one dominant and one recessive copy of the allele don;t sickle cell anemia. Also, due to the problems, the blood cell should prevented the blood from carrying out the oxygen properly.
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what is the pH of the 0.00125 M NaOH solution
About 12.7
Thank google not me XD
The pH of the 0.00125 M NaOH solution is approximately 11. Strong base NaOH totally dissociates into OH- ions in solution.
NaOH is a strong base that totally dissociates in solution to form hydroxide ions (OH-). A 0.00125 M NaOH solution has 0.00125 M hydroxide ions in it, which is equivalent to a pOH of 3. POH is subtracted from 14 to determine pH (pH + pOH = 14). pH is therefore equal to 14 - 3 = 11.
The pH scale measures a solution's hydrogen ion (H+) content. It denotes whether a solution is basic or acidic. The quantity of hydroxide ions (OH-) in a solution is expressed as pOH. It is the hydroxide ion concentration's negative logarithm.
As a result, the significance of the pH of the 0.00125 M NaOH solution are the aforementioned.
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in what process do cell obtain energy from sugar molecules
The process of respiration of ATP which is regenerated by ADP. In conclusion, it’s cellular respiration.
What is the process of production of proteinous enzymes?
LacZ, lacY, and lacA sequences are the structural genes, which needs to be expressed in order to produce their proteinous enzymes required for the breaking down of lactose sugar. The transcription of these three genes must occur with the aid of RNA polymerase binding to them.
A gene sequence called lacI encodes information for an repressor, which when expressed can inhibit the expression of the genes lacZ, lacY, and lacA. Hence, the transcription of the lacyl sequence can cause the cell to not express the lacZ, lacY, and lacA sequences.
Binding the RNA polymerase to the promoter sequence and Transcribing the regulatory gene as well as Translating the lacl sequence into protein by Unbinding the active repressor from the operator.
Therefore, In the example, no RNA is made during the process. Unbinding the active repressor from the operator would need to occur for lacz to be expressed in mRNA. Thus, option D is correct.
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Do animal or plant cells control cell activities?
Answer: Both animal and plant cells are capable of controlling cell activities.
Hope this helps! :)
Explanation:
Each is a mini-ecosystems and a representation of much larger ecosystems found on earth. Describe in detail including plant life and animal life what ecosystem each of these represents.
Answer:
Each is a mini-ecosystems and a representation of much larger ecosystems found on earth. The mini ecosystem is the terrarium
Explanation:
A terrarium is the accumulation of small plants that are being grown in the transparent, or sealed container. It is a closed environment type and are mostly used to know how the ecosystem works within itself. Inside that small container, we can observe various natural processes like photosynthesis, respiration, as well as water cycle. Some small plants cannot adapt well in the home environment, so they can be grown in the terrarium. If they are properly planted and taken care of they can grow with minimum care. By this we can grow indoor plants with less care.
Answer; They all need water and then they will grow.
Explanation: They can be one of the largest and still have a lot of animals in it and the smallest can have a lot and a little depends.
You have a series of cells, all of which were derived from tumors, and you first need to find out
which ones are malignant. What could you do?
a. See which ones are not overproliferating.
b. Find out which ones have a higher rate of apoptosis.
c. Karyotype samples to look for unusual size and number of chromosomes.
d. Measure metastasis.
e. Time their cell cycles.
Answer:
The correct answer is option c. "Karyotype samples to look for unusual size and number of chromosomes".
Explanation:
The number and arrangement of chromosomes are two features that differentiate between a cancer cell that is malignant and a cancer cell that is non malignant. Fortunately, a basic karyotype experiment will be enough to spot a malignant cancer cell. In a karyotype, an unusual large size and an unusual number of chromosomes (aneuploidy) will be indicatives of the presence of malignant cancer cells.
2. Explain the strengths or skills that you have and how they contribute to either academic or personal
accomplishments.
Answer:
The strengths or skills that I have are "high self-esteem" and "optimism."
Explanation:
Self-esteem refers to the confidence in doing a particular task while optimism is all about being positive in any situation.
Firstly, having a high self-esteem made me reach my goals in life. For example in school, I would always showcase my abilities and skills in every subject, without worrying about my classmates' opinions, criticisms or comments. I was able to enter the best university because of my high self-esteem. I've always been confident about passing every examination with flying colors. Secondly, my optimistic personality gave me the courage to rise every time I fall or fail. It is natural to have failures in life and all you have to do is to get back on your feet, realize your mistakes and do better next time. Being optimistic gave me the strength to move on and focus on worthy issues.
Personally speaking, having a high-self-esteem and being optimistic nurtured my social relationships. They gave me confidence in dealing with people and guided me in responding to conflicts. I was also able to become a better version of myself.