The following is not given as a reason that zebrafish are used for testing biologically active compounds: They are invertebrates and have no nerves.
Zebrafish are a popular vertebrate model organism that has become increasingly common in the study of human diseases and drug discovery in recent years. Zebrafish are used for testing biologically active compounds for the following reasons:
They are physiologically similar to humans.
Multiple organs can be examined simultaneously in them.
They develop very quickly from embryo to adult fish.
They are see-through, so organs can easily be seen.
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how does the exposed tissue of cortex becomes protected when primary epidermis fall off in the stem?
Answer:
during secondary growth the primary epidermis spilt, dries, fall off. to protect the exposed tissues and to increase in diameter cork cambium aries in the cortex.
Which of the following is NOT true of anaerobic metabolism? a It is relied upon for high-intensity, short-duration activities like sprinting. b It occurs in the cytosol of cells. c Its primary fuel is fat. d It doesn't require oxygen.
Answer: The option that is NOT true is:
C. Its primary fuel is fat.
Explanation:
Anaerobic metabolism does not primarily rely on fat as its fuel source.
The correct answer is Option (c)
Option (c) Its primary fuel is fat, which is NOT true of anaerobic metabolism.
Let's delve into the topic by breaking down the words anaerobic, which gives us an-aerobic.
Aerobic refers to anything, which involves the presence of air, or more specifically oxygen. Thus any aerobic activity would involve the presence and usage of oxygen for its necessary functions.
Anaerobic would thus mean any activity which doesn't require the presence of oxygen.
Anaerobic metabolism defines the process by which cells, without the presence of oxygen, produce energy for their work. When the supply of oxygen is limited, cells opt for this alternative pathway to produce energy to keep themselves running.
Here, the breakdown of glucose occurs even in limited oxygen to give us ATPs (Adenosine Triphosphate), the energy currency of the cell.
Coming back to the question, we go through the options one by one.
During high-intensity activities like sprinting or heavy exercise, your lungs don't work fast enough to provide the body with enough air. Thus the glucose gets decomposed without the presence of oxygen to give the body the energy it needs through anaerobic respiration.
Thus, option A is correct.
Anaerobic respiration or metabolism occurs in the fluid part of the cell known as the cytosol, due to the availability of a suitable environment for chemical reactions.
Thus option B is correct.
Anaerobic metabolism doesn't require oxygen, as discussed before.
Thus option D is correct.
But, the primary source of fuel for running anaerobic chemical reactions is not fat, but glucose which breaks down to give ATP.
Thus, option C is incorrect.
Thus, the answer to the question is option C.
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Examine the stages of the cell cycle shown here. The steps of the cell cycle, including mitosis, are shown here. Determine which
statements are accurate based on the model shown here. Select ALL that apply.
A)
The correct order is DACB
B)
The correct order is ABCD
Chromatids are separated during the entire process
D)
Choice C shows the separation of homologous chromosomes.
E
Letter B is a cell undergoing cytokinesis by forming a cell plate.
Structures and Functions of Cells
Answer:
the answer is A and C
Explanation:
usatestprep told me
Answer:
A and C
Explanation:
I had this question on my midterm exam in USA test prep
Two plants that are pure bred are crossed. One is short and one is tall, Tall is dominant. If two of their offspring are crossed, what are the
expected phenotypes for the next generation of offspring (F2 generation)?
A. 50% tall, 50% short
B. 100% tall
C. 75% tall, 25% short
D. 100% short
Answer:
C
Explanation:
after doing the genetic cross the parents will be TT so when you cross you get all are Tt if you cross F1 you get a ratio of
1tall:2heterozygous tall:1short
so tall are 75%and short is 25%
The answer to this question is option c. When two of their offsprings are crossed the expected phenotypes for f2 is 75% tall and 25% short.
When a tall and short plant are crossed together. All the plants that are their offspring would all be tall, T.
These offspring are the result of the first crossing. They all now have there genes as TS from their parents TT and SS gene.
When these off springs are crossed, they would have some off springs that are tall and some that are short. This is going to be a crossing of TS and TS. Given that they all possess the tall and short gene.
The ratio of tall to short children they would have according to Mendel is 3:1.
75% : 25% = 3:1
The tall pants are dominant
In conclusion when we divide 75 by 25 we get a ratio of 3:1. This is the ratio of expected phenotypes for The second generation.
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superior vena cava syndrome is a result of a progressive increase of which process?
superior vena cava syndrome is a result of a progressive increase of thrombosis or external compression
Thrombosis occurs when blood clots block your blood vessels. There are 2 main types of thrombosis: Venous thrombosis is when the blood clot blocks a vein. Veins carry blood from the body back into the heart.
Venous thromboembolism (VTE) is a condition that occurs when a blood clot forms in a vein. VTE includes deep vein thrombosis (DVT) and pulmonary embolism (PE). DVT occurs when a blood clot forms in a deep veins, usually in the lower leg, thigh, or pelvis.
Being sedentary due to bed rest or sitting too long without moving, such as during travel. Family history of blood clots. Having a long-term (indwelling) catheter, a tube in a blood vessel. Obesity.
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What is skepticism?
a new scientific idea
being interested in new or different ideas
a general agreement among scientists about a scientific idea
the understanding that knowledge in a particular area can be uncertain
An attitude of skepticism or a tendency to be skeptical, either generally or with regard to a certain object.
What is skepticism and why is it important?In order to be skeptical, one must refrain from leaping to conclusions when examining a claim or an explanation. In the course of a study, it enables scientists to take into account every scenario and rigorously examine all available data.Doubt, dubiety, mistrust, suspicion, and uncertainty are some typical synonyms for skepticism. While all of these terms refer to a "lack of sureness about someone or something," scepticism denotes a refusal to accept something without concrete proof.A sceptic is someone who thinks that some or all of human knowledge is illogical. Skeptics contend that it is preferable to suspend believing rather than rely on the disputed byproducts of reason because even our finest methods for learning about the universe occasionally fall short of full certainty.To learn more about skepticism refer to:
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Answer:
D
Explanation:
The understanding that knowledge in a particular area can be uncertain
How does the exchange of oxygen and carbon dioxide occur in the lungs and tissues ?
Answer:
Gas exchange happens in the alveoli in the lungs and the capillaries that envelop them. When you inhale oxygen, this one moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli. In simple words the exchange comes from the inhalation and exhalation of gases
Quizlet which (putative) cells of the endoderm are specified by the highest levels of wnt and bmp?
Answer:
The content you provided mentions Quizlet and refers to specific cells of the endoderm that are specified by high levels of Wnt and BMP. It seems like you are looking for an explanation of this information.
Explanation:
The endoderm is one of the three primary germ layers that form during early embryonic development. It gives rise to various internal organs and structures, such as the gastrointestinal tract, liver, and lungs. The specification of different cell types within the endoderm is regulated by signaling molecules, including Wnt and BMP.
Wnt and BMP are two important signaling pathways involved in embryonic development. They play key roles in determining cell fate and directing cellular differentiation. In the context of the endoderm, high levels of Wnt and BMP signaling can influence the specification of specific cell types.
While the specific cell types mentioned in the content are not specified, it suggests that certain cells within the endoderm are specified by the highest levels of Wnt and BMP signaling. These signaling pathways likely contribute to the development and differentiation of those particular cell types.
It's worth noting that the exact cell types specified by Wnt and BMP signaling can vary depending on the specific context and developmental stage. Further information would be needed to provide a more precise answer regarding which cells of the endoderm are specified by the highest levels of Wnt and BMP in the Quizlet content you mentioned.
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"1. Please select all true answers.
Formins are regulated by Rho-GTP, which binds the
RBD domain and causes the Formin to open up, exposing its FH1 and
FH2 domains.
Arp2/3 complexes nucleate actin"
Formins contain FH2 domains, which bind G-actin and coordinate the nucleation and polymerization of microfilaments.
Formins are regulated by Rho-GTP, which binds the RBD domain and causes the Formin to open up, exposing its FH1 and FH2 domains.FH1 and FH2 domains have different biochemical functions but coordinate their activities to promote actin filament formation. The FH1 domain interacts with actin monomers and profilin to direct them to the growing barbed end of the filament. The FH2 domain then binds to the end of the filament and catalyzes the addition of actin subunits.
Arp2/3 complexes nucleate actin branches but diffuse before being incorporated into the structure themselves. Arp2/3-dependent actin assembly can power the movement of vesicles from the plasma membrane into the cell.
Both of the given statements, i.e., formins are regulated by Rho-GTP, which binds the RBD domain and causes the Formin to open up, exposing its FH1 and FH2 domains and Formins contain FH2 domains, which bind G-actin and coordinate the nucleation and polymerization of microfilaments are true.
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The full question is given below:
Please select all true answers.
Formins are regulated by Rho-GTP, which binds the RBD domain and causes the Formin to open up, exposing its FH1 and FH2 domains.Arp2/3 complexes nucleate actin branches but diffuse before being incorporated into the structure themselves.Arp2/3-dependent actin assembly can power the movement of vesicles from the plasma membrane into the cell.Formins contain FH2 domains, which bind G-actin and coordinate the nucleation and polymerization of microfilamentsFH1 and FH2 domains have the same biochemical function but are named differently to indicate their distance from the RBD domain.Which best describes the scientists who contribute to our current body of knowledge?
Scientists are driven by curiosity, possess critical thinking skills, and are dedicated to the pursuit of knowledge. They contribute to our current body of knowledge through meticulous research, collaboration, and a commitment to evidence-based reasoning, ultimately advancing our understanding of the natural world and shaping the progress of scientific discoveries.
Scientists who contribute to our current body of knowledge are individuals dedicated to the pursuit of understanding and expanding our understanding of the natural world. They are driven by curiosity, the desire to explore unanswered questions, and the passion for discovery.
These scientists possess several key characteristics. Firstly, they exhibit a strong scientific mindset, which includes critical thinking skills, skepticism, and a commitment to evidence-based reasoning. They are meticulous in their research methodologies, conducting experiments, gathering data, and analyzing results with precision and rigor.
Additionally, scientists are often highly knowledgeable in their respective fields, having obtained advanced degrees and specialized training. They stay up-to-date with the latest research and developments in their areas of expertise, constantly expanding their understanding and building upon existing knowledge.
Scientists are also collaborative and actively engage in scientific communities. They share their findings through scientific publications, presentations at conferences, and discussions with their peers. They seek feedback, engage in constructive debates, and participate in interdisciplinary collaborations to tackle complex problems.
Moreover, scientists are resilient and persistent. They encounter setbacks, face challenges, and encounter failures along their scientific journey. However, they view these obstacles as opportunities for growth and learning, adapting their approaches and methodologies to overcome obstacles and advance their understanding.
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If individuals with this trait survive the season and breed, what would best
describe their offspring?
F. They would only eat organisms E.
G. They would have their parents' features.
H. They would learn to eat organism F.
I. They would be unable to survive in the wild.
Answer:
the answer is F
Explanation:
Calculate the free energy change for glucose entry into cells when the extracellular concentration is 7.0 mM and the intracellular concentration is 3.0 mM at 37oC. Express your answer in kJ/mol.
The free energy change for glucose entry into cells can be calculated using the formula ΔG = RTln([glucose]in/[glucose]out), where R is the gas constant, T is the temperature in Kelvin, and [glucose]in and [glucose]out are the intracellular and extracellular concentrations of glucose, respectively.
Given that [glucose]out = 7.0 mM and [glucose]in = 3.0 mM at 37oC (which is 310 K), we can substitute the values into the formula:
ΔG = (8.314 J/mol*K) * (310 K) * ln(3.0/7.0) / 1000 J/kJ
ΔG = -4.26 kJ/mol
Therefore, the free energy change for glucose entry into cells is -4.26 kJ/mol.
To calculate the free energy change (ΔG) for glucose entry into cells, you can use the following equation:
ΔG = RT ln(C2/C1)
where R is the universal gas constant (8.314 J/mol K), T is the temperature in Kelvin (37°C = 310.15 K), C1 is the initial concentration (extracellular concentration, 7.0 mM), and C2 is the final concentration (intracellular concentration, 3.0 mM).
ΔG = (8.314 J/mol K) × (310.15 K) × ln(3.0 mM / 7.0 mM)
ΔG = 2581.10 J/mol × ln(0.4286)
ΔG ≈ -3674.86 J/mol
To convert J/mol to kJ/mol, divide by 1000:
ΔG ≈ -3.675 kJ/mol
The free energy change for glucose entry into cells when the extracellular concentration is 7.0 mM and the intracellular concentration is 3.0 mM at 37°C is approximately -3.675 kJ/mol.
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Which level of the pyramid below is correctly paired with the type of organism that would most likely be found at that level in an ecosystem?
Answer:
1st level
Explanation:
Since the organism is a decomposer, it creates its own food, their for it's at the bottom of the food chain
What role does fossil fuels play in the carbon cycle? *
They are a sink of carbon. The carbon in fossil fuels hasn't been in the carbon cycle in
millions of years.
They absorb carbon dioxide from the atmosphere with their buffering ability
The fossil fuels are getting more acidic because they are absorbing too much carbon
dioxide
Fossil fuels are not involved in the carbon cycle. They are involved in nutrient cycling.
Answer:
A
Explanation:
Carbon moves from fossil fuels to the atmosphere when fuels are burned. When humans burn fossil fuels to power factories, power plants, cars and trucks, most of the carbon quickly enters the atmosphere as carbon dioxide gas. Each year, five and a half billion tons of carbon is released by burning fossil fuels.
In which case would a widely accepted scientific idea MOST likely be revised?
A)
when an error is found in a previous calculation
B)
when scientists calculate a quantity with greater accuracy
0
when several well-tested findings go against the accepted idea
D)
when an experiment supporting the idea is shown to have been wrong
Answer:
C, I had a test on this.
Explanation:
According to the question, when several well-tested findings go against the accepted idea .
Which science is most complex?Psychology, in a sense, is dealing with the highest complexity of all: brains studying brains. For this reason, psychology is the most difficult science."
Thus, option "C" is correct.
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it’s for 01.05 energy lab worksheet
Describe the five adjustments you made to the Rube Goldberg device in order to keep the
flow of energy going.
Answer:
The five adjustments I made to the Rube Goldberg device in order to keep the flow of energy going include
Changing the angle
Putting the rubber band firmly to the white ball
Changing the position of the weight
Attaching the 5lbs to the rope on the third platform found in close proximity to the green tube so it can enter into the see saw device.
Explanation:
agree with guy on top kjgcfvg
If a scientist found a beaker of a substance in a lab, which of the following would the scientist most likely use to identify the substance?
A. taste, smell, touch and sound
B. Melting point, ability to burn, boiling point and density
C. Poking, prodding, pouring and partaking
D. Research on Wikipedia
TACAAACACTATACCGCGTAAATGATT Write the complement to the strand of DNA shown above, break it up into the proper triplets.
Answer:
The complementary base pair is ATG TTT GTG ATA TGG CGC ATT TAC TAA
Explanation:
As per the complementary base pairing rule of DNA
C pairs with G and vice versa
A pairs with T (in DNA) or U (in RNA)
Breaking the given strand into triplets, we get -
TAC AAA CAC TAT ACC GCG TAA ATG ATT
ATG TTT GTG ATA TGG CGC ATT TAC TAA
a. How does the DIY DNA extraction compare to an extraction using a kit? Why?
b. How can you tell?
a. DIY DNA extraction methods typically use household ingredients and may lack specialized reagents for optimal yield, purity, and efficiency compared to extraction kits designed with standardized protocols.
b. Differences can be assessed through factors such as protocol complexity, DNA yield, purity assessment, and reproducibility of results between DIY and kit-based extractions.
a. The DIY DNA extraction and an extraction using a kit can differ in several aspects:
Ease of Use: DIY DNA extraction methods often utilize household ingredients and materials, making them simpler and more accessible for amateur scientists or educational purposes. Kits, on the other hand, are specifically designed with pre-measured reagents and detailed protocols, providing a standardized and user-friendly approach.
Efficiency and Yield: DNA extraction kits typically incorporate optimized protocols and specialized reagents that ensure higher efficiency and yield of extracted DNA. DIY methods may not always achieve the same level of efficiency, leading to lower DNA recovery or potential contamination.
Purity and Quality: DNA extraction kits generally include steps and reagents to remove contaminants (such as proteins and RNA) and ensure higher purity of the extracted DNA. DIY methods may lack these purification steps, resulting in impurities or degraded DNA.
b. A few indicators can help determine the differences between DIY DNA extraction and kit-based extractions:
Protocol Complexity: Comparing the step-by-step procedures of DIY methods and kit-based methods can reveal differences in complexity and the presence of additional purification or quality control steps in kits.
DNA Yield: Quantifying the yield of extracted DNA can provide insights into the efficiency of the extraction method. If the yield from a DIY extraction is consistently lower compared to a kit-based extraction, it suggests that the kit-based method may be more efficient.
Purity Assessment: Evaluating the purity of the extracted DNA can be done through techniques such as spectrophotometry or gel electrophoresis. If the DNA extracted using a kit shows less contamination or degradation than the DIY-extracted DNA, it indicates better quality control in the kit-based method.
Reproducibility and Consistency: Performing multiple extractions using both the DIY method and a kit and comparing the results for consistency and reproducibility can also indicate differences in performance and reliability.
It's important to note that DIY DNA extraction methods can be useful for educational purposes or preliminary experiments, but for more precise and standardized results, DNA extraction kits developed by reputable manufacturers are generally recommended.
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What type of landform is created by divergent plate boundaries?
-Mid-Ocean Ridge
-Mountains
-Trench
Answer:
Mid-Ocean Ridge
Explanation:
Landforms created by divergent plates include the Mid Atlantic Ridge and the Great African Rift Valley.
Which organelle plays a role in intracellular digestion? lysosome chloroplast ribosome golgi apparatus plasmodesma
Lysosome organelle plays a role in intracellular digestion.
What is intracellular digestion?To function, all living things need energy. Cells must not only take molecules from their surroundings but also disassemble them in order to get energy from their external environment. Internal digestion is the term for this process.
Intracellular digestion refers to the process of food digestion that occurs directly inside the cells. Species with only one cell, such as amoebas, experience it.
When food is digested intracellularly, food components are broken down into smaller molecules inside of the cell's food vacuoles. When food is broken down into small molecules through extracellular digestion, it happens outside of the cell, either on decomposing organic matter or in the alimentary canal lumen.
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Pasta, Fruit, Bread, and Rice are examples of what type of food?
A. Proteins
B. Nucleic Acids
C. Carbohydrates
D. Lipids
What did light energy do to the water
Answer:
It breaks down the water molecules and combines those molecules with the carbon dioxide molecules to form glucose and oxygen.
Explanation:
6CO2 + 6H2O + Light energy → C6H12O6 + 6O2
CO2 = Carbon dioxide: 'di' in 'Carbon dioxide' means 2O2 is oxygenC6H12O6 is sugar aka glucoseH2O is waterNow that you have watched the video clip, how is chemical change different from physical change?
Practice
A
Pollutants are formed during a chemical change.
B
New substances are formed during a chemical change.
C
Only living things drive the process of chemical change.
D
Material is broken down into smaller pieces without any chemical reactions during a chemical change.
HELP ME PLEASE!! 50 POINTS
Draw a model that explains how your experiment demonstrated the transfer of genetic material from the parent to the offspring. In your model, clearly label where the transfer of genes from parent to offspring occurred.
We design a model that explains how your experiment demonstrated the transfer of genetic material from father to offspring. In our model, we clearly identify where the transfer of genes from parents to children took place, and in this practical way, we explain heredity.
Transmission of genetic informationHeredity is the biological system of transmission of certain characteristics of living beings between generations. For the full functioning of this structure, genes are needed – a piece of DNA (deoxyribonucleic acid) that houses genetic information.
Some properties can remain inactive for generations, which does not represent their extinction, only the forgetting of one or several genes. However, this does not make it impossible for the carrier of the dormant gene to pass it on to their descendants.
In addition, genetic information is capable of disappearing as a result of environmental and climate change. In these cases, natural selection processes directly affect heredity.
With this drawing, it was possible to visualize how gene transfer occurs in a normal situation.
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which equation represents an oxidation-reduction reaction
An oxidation-reduction reaction, also known as a redox reaction, involves the transfer of electrons between two species. In such reactions, one species undergoes oxidation (loses electrons) while the other undergoes reduction (gains electrons). A common example of a redox reaction is the reaction between hydrogen and oxygen to form water:
2H₂ + O₂ → 2H₂O
In this equation, hydrogen is oxidized, losing its electrons to oxygen, while oxygen is reduced, gaining the electrons from hydrogen. Thus, the equation represents an oxidation-reduction reaction.
A chemical reaction is considered an oxidation-reduction reaction if there is a transfer of electrons between the reactants. The equation representing an oxidation-reduction reaction will have at least one element that undergoes an increase or decrease in oxidation state. For example, the reaction between magnesium and oxygen to form magnesium oxide can be represented by the equation:
2Mg + O2 -> 2MgO
In this equation, magnesium undergoes oxidation by losing electrons and oxygen undergoes reduction by gaining electrons. This reaction is an example of an oxidation-reduction reaction.
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A virus that infects bacteria is called a __________, which is made up of the macromolecules __________ and __________.
A virus that infects bacteria is called a bacteriophage which is made up of the macromolecules DNA and Protein.
How do you explain bacteriophage ?A bacteriophage, or phage in colloquial use, is a duplodnaviria virus that infects and replicates inside bacteria and archaea (/bktrio/). The word "bacteria" was taken from the Greek verb "phagein," which means "to consume." Bacteriophages are made of proteins that enclose a DNA or RNA genome and can have either straightforward or complex structural designs. Their genomes might contain as little as four genes (MS2, for example) or as many as hundreds. The insertion of the phage genome into the cytoplasm of the bacterium initiates phage replication within the bacterium.One of the most prevalent and varied organisms in the biosphere is the bacteriophage. Bacteriophages are pervasive viruses that may be found anywhere there are bacteria.Learn more about bacteriophage refer to :
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Which characteristics do fish and amphibians have in common? Select all that apply.
They use gills at some point in their life cycle.
They use lungs at some point in their life cycle.
Their eggs are laid in water for reproduction.
Their bodies match the temperature of their environment.
Answer:
A C D
Explanation:
They use gills at some point in their life cycle.
Their eggs are laid in water for reproduction.
Their bodies match the temperature of their environment.
The seafloor has some valuable minerals. Manganese nodules containing manganese, iron, copper, nickel, phosphate, and cobalt may be as small as a pea or as large as a basketball. Estimates are that there may be as much as 500 billion tons of nodules on the seafloor. The minerals in manganese nodules have many uses in the industrial world, but currently they are not being mined.
Why do you think these seafloor resources are not being mined? (Please write a complete sentence or two)
giving 50 points!
The ocean floor is home to a very large number of aquatic life which would be destroyed when we mine manganese nodules from the ocean floor.
What is the sea floor?Deep down in the ocean we have the sea floor which is the region that has a lot of organisms that tend to fasten to the rocks that are found beneath the sea. Organisms are all interconnected and these deep sea dwellers also a role to play in the sustenance of the entire aquatic habitat thus the area where they live must be preserved from damage.
Owing to the fact that the ecosystem does sustain itself, we have to look at the broader picture of the things that these organisms have to contribute to the overall maintenance of the sea ecosystem. For instance, the decomposers are found among these deep sea dwellers..
If we mine the minerals from the deep sea, we would destroy the ecosystem and the habitat at the bottom of the ocean or sea.
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What best describes the relationship between microbes and humans
Answer:
I'd say C.
Explanation: