In a particular case of secondary succession, three species of wild grass all invaded a field. By the second season, a single species dominated the field and the other two species had a lower relative abundance. A possible factor contributing to the abundances of these species in this example of secondary succession is_________.
A. equilibrium B. immigration C. inhibition D. parasitism
Answers
In a particular case of secondary succession, three species of wild grass all invaded a field. A possible factor contributing to the abundances of these species in this example of secondary succession is inhibition
What is secondary succession?
When a climax community or an intermediate community is affected by a disturbance, secondary succession occurs. The succession cycle is restarted, but not to the start because the soil and nutrients are still there.
Oak and hickory woods that have been burned down provide a great illustration of secondary succession. Most vegetation will be destroyed by wildfires, and any animals unable to escape the region will perish. However, ash is the form in which their nutrients are returned to the earth.
On degraded forest, secondary succession occurs. The process of an ecosystem recovering after a traumatic event, such as a fire, avalanche, or agricultural clearance, is known as secondary succession. Deforestation of communities occurs more quickly than primary succession growth.
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Related Questions
True or False. Water stayed in the straw activity we did because of water pressure.
1. False
2. True
Answers
Answer:
2
Explanation:
because it being pressure
Answer:
1. False
Explanation:
i took a quiz
Which bacteria is more resistant to antibiotics? Why? Explain in at least 3 well-written sentences.
Answers
The bacteria which is more resistant to antibiotics are the Gram-negative bacteria. These are more resistant than the Gram-negative bacteria and are a severe threat to humans and cause severe mortality and morbidity.
In 2017, the World Health Organisation (WHO) published a report stating a list of pathogens that are antibiotic resistant and the majority of the list included Gram-negative bacterial pathogens. The excessive dispensing and irresponsible usage of antibiotics has resulted in the development of these resistant bacterial pathogens. Strategies to fight and control resistant Gram-negative bacteria are modifying the structure of existing antibiotics, developing antimicrobial auxiliary agents and etc. This bacteria represents a health crisis and signals health threats for humans to face.
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what is an identifying characteristic of the chemical structure of proteins? a. proteins always contain nitrogen atoms. b. proteins have identical repeating units within the structure. c. all carbon atoms in proteins are bonded to at least three hydrogen atoms. d. amine groups are found at both ends of the chemical backbone in proteins. e. the side chains in amino acids have either a positive charge or negative charge.
Answers
Answer: a. proteins always contain nitrogen atoms.
What is a surface current ?
Answers
Answer:
Surface currents in the ocean are driven by global wind systems that are fueled by energy
Explanation:
pls me brainliest
Answer:
They are winds caused by movements of water by land boundaries.
Explanation:
Other factors that influence the currents are regional excesses of evaporation or precipitation.
Hope this helps:)
Which statement is FALSE about epigenetic modifications?
a. The tails of the nucleosome octamer components can be modified with methylation
b. The tails of the nucleosome octamer components can be modified with acetylation
c. Only non-DNA components of chromatin are modified with epigenetic markers
d. Epigenetic modifications control whether a region is euchromatin or heterochromatin
Answers
The false statement about epigenetic modifications is:
c. Only non-DNA components of chromatin are modified with epigenetic markers.
Epigenetic modifications refer to changes in gene expression that do not involve changes to the underlying DNA sequence. These modifications can be inherited and can influence how genes are turned on or off in different cells or at different stages of development.
a. The tails of the nucleosome octamer components can be modified with methylation: This statement is true. Methylation of the tails of nucleosome octamer components, which are made up of histone proteins, can affect gene expression by either activating or repressing the associated genes.
b. The tails of the nucleosome octamer components can be modified with acetylation: This statement is also true. Acetylation of histone tails is another type of epigenetic modification that can influence gene expression. Acetylation generally leads to gene activation by relaxing the chromatin structure and allowing transcription factors to access the DNA.
d. Epigenetic modifications control whether a region is euchromatin or heterochromatin: This statement is true. Epigenetic modifications play a crucial role in determining whether a region of DNA is in a euchromatin state, which is more accessible for gene expression, or a heterochromatin state, which is more condensed and less accessible for gene expression.
In summary, the false statement is c. Only non-DNA components of chromatin are modified with epigenetic markers. Epigenetic modifications can occur on both DNA and non-DNA components of chromatin, such as histone proteins. These modifications can have significant impacts on gene expression and are essential for cellular development and function.
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which will have a bigger impact a deletion/insertion near the beginning of a gene or towards the end of a gene
Answers
A deletion or insertion near the beginning of a gene will have a larger impact than a deletion or insertion towards the end of a gene. This is because the beginning of a gene typically contains the promoter region and start codon.
To understand why deletions/insertions at the beginning of a gene have a larger impact than those towards the end of a gene, it is important to understand how a gene works.
Genes are made up of different parts, including a promoter region, exons, introns, and terminator region.
The promoter region is located at the beginning of the gene and contains the information necessary for gene transcription. This includes the start codon and transcription factor binding sites, which are responsible for initiating the process of transcription and determining when, where, and how much of the gene product is made.
If a deletion or insertion occurs in this region, it can significantly disrupt gene transcription and alter the rate and extent of gene expression.
In contrast, deletions or insertions towards the end of a gene are less likely to have a large effect on gene expression. This is because the terminator region is usually located at the end of the gene and does not contain essential information for transcription. As a result, any changes in this region are more likely to have limited effects on gene expression.
In summary, any changes near the beginning of a gene will have a larger impact than changes towards the end of a gene.
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What are the structures that make up a DNA molecule and where does your body get all
the molecules and compounds needed to make DNA structures in all of your body cells?
Explain.
Answers
drug obtained from plants is :
A] MORPHINE
B] INSULINE
C] ASPIRIN
D] CEPHLOSPORIN
Answers
A study was conducted in a particular preschool to investigate whether there is a link between breastfecding and a child's level of intellectual functioning, 20 breastfed and 40 not breastfed (non-breastfed) four year old children were involved. Each child is allocated a unique ID number between 1 and 60 (inclusive). Each child had to answer a few basic questions. To motivate them to answer all questions, the investigator offered Whittaker's Miraka Kirīmi (chocolate) bar. (a) For each of the following scenarios, identify the named distribution that can be used to model X, including its parameter(s). i. Each day a randomly chosen child is given a chocolate bar. All 60 children are in the draw every day. Let X be the number of days before the child with ID number 1 is chosen twice. Note that the day on which the child with ID number 1 is chosen for the second time is not counted. [2 marks] ii. Five children are randomly chosen to sit around one table and do their test. Let X be the number of non-breastfed children chosen. [2 marks] (b) Refer to your choice of named distribution in 2(a)ii above and answer the following questions. i. Find the expected value of X,E(X), and the variance of X,Var(X). [2 marks] ii. What is the probability that at least one child in the group of five children chosen to do the test is breastfed? [2 marks]
Answers
The variance of X, Var(X), for the hypergeometric distribution, the formula is: 1.67
How to calculate the valueThe hypergeometric distribution has three parameters:central idea
N: the total population size (60 children in this case)
K: the number of success states in the population (40 non-breastfed children in this case)
n: the number of draws (5 children chosen in this case)
To calculate the variance of X, Var(X), for the hypergeometric distribution, the formula is:
Var(X) = n * (K / N) * ((N - K) / N) * ((N - n) / (N - 1))
Using the same values as before, we have:
Var(X) = 5 * (40 / 60) * ((60 - 40) / 60) * ((60 - 5) / (60 - 1))
= 1.67
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A mixture of iron, salt and sand can be separated using a magnet, water, a filter and a hot plate. Think about this separation. The separation of this mixture
Answers
Answer:
Explanation:
This is an example of a mixture which can be separated with simple separation techniques based on the physical properties of the mixtures.Magnetism, and filtration and evaporation
Iron is a magnetic material,but salt and sand are not,Therefore,the iron can be separated from the mixture with the use of magnet.
Salt and sand are mixable.But salt is soluble in water,but sand is not.Therefore by adding the sand and salt to water,the salt will dissolve,in the water(solvent) to form a salt solution. But the sand can be separated out of the solution by filtration with the filter paper inserted into a funnel which allows the salt solution to pass through,while restricting the sand.
The sand would be removed by the filter paper,while solution passes through.
The salt solution and some sand residues is placed in evaporating dish and heated at low temperature. The water from the solution evaporates,leaving the salt behind.
A combination of two are more substances that is not chemically combined is called a mixture.
In order to separate a mixture of iron, salt and sand, we need a magnet, water, a filter and a hot plate. The magnet is brought close to the mixture and all the iron is removed.
Next, water is added. The water will dissolve the salt while the sand will settle beneath the vessel. The solution can now be filtered and the sand is removed. To recover the salt, the solution is heated using the hot plate until all the water is evaporated and the dry salt is recovered from solution.
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PLEASE HELP AND GET POINTS!!
Drag the phrase to indicate which fossil fuel it describes. A phrase may be used more than once. (2 points)
coal: Oil: Natural gas:
:: formed at at the bottom of swamps
oil
:: made mostly of methane
natural gas
::made mostly of hydrocarbons
:: sediment, rock, and water apply pressure and heat to plant remains
:: formed at the bottom of the ocean where sediment, rock, and water apply pressure and heat
⠀⠀
Answers
The correct phrase for the word is the following:
Coal: sediment, rock, and water apply pressure and heat to plant remains.
Oil: formed at the bottom of the ocean where sediment, rock, and water apply pressure and heat.
Natural gas: made mostly of methane.
What are natural gases?Natural gas, when extracted, can contain a range of elements and molecules other than methane. A natural gas well may contain water, ethane, butane, propane, pentanes, hydrogen sulfide, carbon dioxide, water vapor, and, on rare occasions, helium, and nitrogen.
Therefore, the correct options are coal: 3, Oil: 5, and Natural gas: 2.
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Answer:
Sediment, rock, and water apply pressure and heat to plant remains is how coal forms. Oil is formed at the bottom of the ocean where sediment, rock, and water apply pressure and heat. Natural gas is mostly made from methane.
which statement about natural selection on early earth is correct? which statement about natural selection on early earth is correct? natural selection could act on a population of proto-cells on early earth, selecting for those that were stable and had self-replicating, catalytic rna that allowed them to grow and divide to produce similar daughter proto-cells. natural selection acted on populations of proto-cells on early earth in order to make them more like modern living cells that have dna as their genetic material. natural selection could only act on populations of living organisms that had dna as their genetic material.
Answers
Natural selection could act on a population of proto-cells on early Earth, selecting for those that were stable and had self-replicating, catalytic RNA that allowed them to grow and divide to produce similar daughter proto-cells, is the statement that is correct.
On early Earth, there were no living organisms with DNA as their genetic material. Instead, there were self-replicating, catalytic RNA molecules that acted as proto-cells.
Natural selection could act on populations of these proto-cells, selecting for those that were more stable and had characteristics that allowed them to grow and divide to produce similar daughter proto-cells. This process could lead to the development of more complex proto-cells that eventually evolved into the first living organisms.
Therefore, the correct statement is that natural selection could act on a population of proto-cells on early Earth, selecting for those that were stable and had self-replicating, catalytic RNA that allowed them to grow and divide to produce similar daughter proto-cells.
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Do you think it will be easy or difficult to tell one type of wood from another? explain why or why not
Answers
Answer:
It can be both easy and hard, depending on things like the color and age. If the color is light it's probably something like birch, if you count the rings inside a tree stump you can tell how old it is, if it has over 300 rings it's mostly likely an evergreen tree. <333
a/an ________ is a flexible, fiberoptic scope with a magnifying lens and a light source that can be inserted into the nose to examine the sinuses and take a biopsy.
Answers
A/an nasal endoscope is a flexible, fiberoptic scope with a magnifying lens and a light source that can be inserted into the nose to examine the sinuses and take a biopsy.
A nasal endoscope is a medical instrument used by otolaryngologists (ear, nose, and throat specialists) to visually examine the nasal passages, sinuses, and other structures in the nose. It consists of a thin, flexible tube with a light source and a magnifying lens at the tip. The light illuminates the area being examined, while the lens magnifies the image, allowing the physician to see detailed structures inside the nose. Nasal endoscopy is a minimally invasive procedure that helps in the diagnosis and treatment of various conditions, such as chronic sinusitis, nasal polyps, tumors, and infections. Biopsies can also be taken using specialized instruments passed through the endoscope to obtain tissue samples for further analysis. Nasal endoscopy is generally well-tolerated by patients and provides valuable information for accurate diagnosis and treatment planning.
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True or False
The cell theory is 1. All living things are made of cells, 2. The cell is the basic unit of life, 3. All cells come from pre existing cells.
Answers
Answer:
True
Explanation:
All three are true, I've learned about cells before :D Have a nice day
In a system with four trophic levels (producers, herbivores, and two levels of predators) exhibiting trophic cascades, what would you expect to happen if a species at the fifth trophic level is added (a predator on the current top predator
Answers
The addition of a predator at the fifth trophic level could have a range of effects on a system with four trophic levels exhibiting trophic cascades. It would depend on the specific characteristics of the predator and the existing relationships between the species in the system.
First, it's important to understand what a trophic cascade is. A trophic cascade is a phenomenon that occurs when changes in the abundance of one species at a particular trophic level can affect the abundance of species at other trophic levels. For example, if the population of predators at the third trophic level decreases, the population of herbivores at the second trophic level may increase because there are fewer predators eating them. This increase in herbivore population could then lead to a decrease in the population of producers at the first trophic level, because there are more herbivores eating them.
Now, let's consider what might happen if a predator at the fifth trophic level is added to this system. One possibility is that the predator could have a direct impact on the population of the current top predator, causing a decrease in its population. This could then lead to a decrease in the population of the predator at the fourth trophic level, which would allow the population of herbivores at the third trophic level to increase. This increase in herbivore population could then lead to a decrease in the population of producers at the first trophic level, due to increased herbivory.
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Zeke is trying to plant a garden but he does not have much space. Zeke decides to trim the ends of the roots of the plants he is putting in his garden. After a week, Zeke notices that his plants did not grow at all. Explain why this happened.
Answers
Answer:
Zeke has cut the meristematic cells at the root tip, hence, the root will not elongate to get nutrients and water needed for plant growth.
Please find more explanation below
Explanation:
The root tips of a plant contain cells that actively divide, hence, causing growth or elongation of the roots. This allows the root to grow or penetrate into the soil in search of nutrients and water needed for the plants growth.
According to this question, Zeke decided to trim the ends of the roots of certain plants he is putting in his garden due to lack of space. However, he later discovered that these plants did not grow at all. This is because Zeek has cut off the root tip that contains the MERISTEMATIC CELLS responsible for the elongation of the roots into the soil. Hence, the roots are unable to absorb water and nutrients for the plant, preventing the overall growth of the plant.
which element in the side chain is most likely responsible for methionine unique properties?
A. Carbon
B. Sulfur
C. Hydroge
Answers
Sulphur is the element most likely responsible for methionine unique properties.
METHIONINE:
Methionine is one of the essential amino acids in nature. Methionine is also a sulfur containing amino acid alongside cysteine. Generally, amino acids are structurally made up of an amino group (-NH2), a carboxyl group (-COO) and a R side chain. The R side chain differentiates each amino acid as no two amino acids possess the same side chain. The side chain of methionine contains sulphur, which accounts for its unique properties as an amino acid.Learn more at: https://brainly.com/question/14193995?referrer=searchResults
how can you separate iron filings from sand through which process
Answers
Answer:
Process called magnetic separation
Explanation:
The magnetic separation is a process in which magnetically susceptible material is extracted from a mixture using magnetic force.
This method is also used to separate the mixture of sand and iron fillings as iron is attracted by magnet.
Answer:
Use a magnet to separate the iron filings from sand since iron is magnetic
1. A ____________________________ is a line on a topographic map that connects points of equal elevation
2. A _______________________________ is a darker and/ or thicker contour line that is labeled with the elevation of that line.
3. The distance between two contour lines is call the ______________________________________________.
4. On a topographic map contour lines that have a "V" shape indicate that ______________________ is occurring.
5. On a topographic map the V shape contour lines point________.
Answers
Answer:
1. contour line
2. index contour
3. contour interval
4. a valley
5. upstream
Explanation:
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What are accommodation reflexes, and how do they support seeing objects that are near and far
Why do rods not function effectively in bright light while cones do not function effectively in dim lights?
Answers
The accommodation reflex, also known as the close reaction, is a three-part reflex that thickens the lens, constricts the pupil, and rotates the eyes inward, or converges the eyes.
What accommodation reflexes and rods relations?When a person examines a close object, the medial rectus muscle becomes more toned and the pupil constrictes (the papillae constrictor muscle contracts), which together result in accommodation and convergence of the eyes.
Therefore, The accommodation reflex's job is to coordinate the visual focus of attention on nearby things. Diplopia is avoided by proper convergence. The depth of field is increased by pupil constriction.
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Explain how so many types of cells can be formed even though all the cells have the same DNA.
Answers
Because all of your cells in your body started off as single cells. That single cell then divided into multiple other cells. So it breaks down so it can help the entire body equally. In order for a cell to work 1,000 of these proteins need to be created.
Which statement best describes how genes & inherited traits are related?
(a) some genes have no instruction for an inherited trait
(b) Individual genes carry the instruction for inherited traits.
(c) inherited traits carry the instructions for individual genes
(d) Some inherited traits are prevented by the instructions in a gene
Answers
Individual genes carry the instruction for inherited traits. Option B.
Relationship between genes and inherited traitsIn genetics, genes are considered the basic unit of hereditary responsible for the transfer of traits from parents to offspring.
In other words, genes are like programmed instructions for the expression of traits. Every expressed trait has a gene behind it.
Genes are located on chromosomes of DNAs.
The totality of the genes an organism possesses is known as the genome.
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Which claim is most likely based on science?
A.Teas made from carrot leaves and stems are remedies that cleanse toxins from the body.
B.The orange color of carrots is due to a chemical called beta carotene.
C.Orange-colored carrots taste better than white or purple carrots.
D.Orange-colored carrots were introduced by the Dutch people, who preferred them to white carrots.
HELPPPP
Answers
Answer:
B
Explanation:
what is the term for a structure that has no use in an organism?
A) homologous
B) Index
C) Vestigial
D) Sedimentary
Answers
Answer:
c) vestigial
Explanation:
vestigial tend to be largely or entirely functionless
in the modern world many countries with kings or queens have enolved into constitutional democracies, monarchs are mostly?
.
Answers
In the modern world, many countries with kings or queens have evolved into constitutional democracies, and the role of the monarch has evolved over time from that of a politically important figure to one that is more symbolic and ceremonial.
What is the significance of the monarchy?The monarchy is limited by a written constitution, the principle of the rule of law in the modern world, and representing the country at official events and ceremonies, which vary from country to country.
Hence, in the modern world, many countries with kings or queens have evolved into constitutional democracies, and the role of the monarch has evolved over time from that of a politically important figure to one that is more symbolic and ceremonial.
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When streaking a throat culture on blood agar, stabbing the agar plate provides detection for Streptolysin O Bile solubility Streptolysin S DNase activity 100
Answers
When streaking a throat culture on blood agar, stabbing the agar plate provides detection for Streptolysin O. The stabbing method is also called the puncture method, and it helps in determining Streptococcus pyogenes' hemolytic activity.
Streptococcus pyogenes produces two hemolytic toxins, streptolysin O (SLO) and streptolysin S (SLS). These toxins are necessary for establishing an infection.
The throat culture on blood agar plate is used to diagnose a throat infection. The process of inoculation involves streaking and stabbing.
Streaking is performed by moving the swab back and forth over the surface of the agar. It helps in identifying the colonies that have formed on the agar's surface.
On the other hand, stabbing is done by inserting the swab into the agar medium and then withdrawing it. It is useful for detecting the presence of hemolytic toxins.
In case of streptococcal infection, the throat culture is used to detect SLO activity. SLO causes beta-hemolysis, which is visible as a clear zone around the colonies.
By stabbing the agar plate, the SLO remains within the colony, resulting in no hemolysis around the colony. However, if the colonies are streaked on the surface, SLO diffuses out of the colony, causing beta-hemolysis.
Therefore, by stabbing the agar plate, it helps in detecting SLO activity.
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Write the sequence of the mRNA strand that would be coded from the following strand of DNA:
TACCGAATTCGC
Please help me with this!!!
Answers
Answer:
DNA: TACCGAATTCGC
mRNA: AUGGCUUAAGCG
RNA: A=U, T=A, G=C
RNA contains Uracil and Thymine is no longer present
judge the following sentence according to the criteria given below: marine invertebrates such as worms, mussels, and octopuses have had to evolve special mechanisms to maintain their body fluids at a proper concentrations because their body fluids are nearly hypotonic.
Answers
Because their body fluids are virtually hypotonic, genuine invertebrates like worms, mussels, and octopuses have to develop unique processes to keep their bodily fluids at the right amounts.
What causes the majority of marine species to reside close to the ocean's surface?Surface water is blown by wind currents. The ascent of nutrients to the ocean's surface is impacted by this action. Why do the majority of marine species inhabit the water's surface? The nutrients and sunlight that creatures require are present here.
What three sorts of marine life are there?Plankton, nekton, and benthos are the three basic categories of marine life. Aquatic plankton float. Nekton float in the water and swim. Benthos are seafloor dwellers.
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why do environmental and occupational health (eoh) practitioners need a firm grasp of basic epidemiological principles in their daily work?
Answers
Environmental and occupational health (EOH) practitioners need a firm grasp of basic epidemiological principles in their daily work as epidemiological principles help EOH practitioners to recognize and analyze disease patterns and patterns of exposure to environmental contaminants that cause disease.
Epidemiology is the study of how diseases spread and how to prevent or treat them. EOH practitioners must know the science behind disease transmission and prevention, as well as how to perform public health surveillance and risk assessments.
EOH practitioners work in a wide range of settings, including hospitals, local health departments, state and federal government agencies, and academia. They often work with colleagues from various disciplines such as toxicology, biostatistics, and environmental science, among others. They use a range of epidemiological tools to investigate environmental and occupational health hazards that can affect human health. They must also understand the statistical methods used to analyze and interpret data obtained from epidemiological studies.
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