A Final statement or concluding statement
Correct answer is ‘B’ .
Stabilizing selective pressures result in limited evolutionary changes
How do selective pressures affect evolution?Stabilizing selection is a type of natural selection that results in a decrease in genetic diversity and the stabilization of population traits over time.
Selective pressures are thought to be forces that drive evolution through natural selection.
Depending on the external conditions, some phenotypes are more advantageous than others.
A phenotype is a specific way that genes are expressed in an organism's physical traits or characteristics.
To work, selective pressure must have at least two possible phenotypes for members of a population to exhibit.
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In classical conditioning, a stimulus that originally elicited no response but after association with an unconditioned stimulus comes to trigger a conditioned response is call a(n)?
In classical conditioning, a stimulus that originally elicited no response but after association with an unconditioned stimulus comes to trigger a conditioned response is call an unconditioned response.
Pavlov's experiment- First Pavlov tried to get the attention of the dog with the sound of a bell, but the dog did not salivate so, this was a neutral stimulus. After that he presented him with food, the dog salivated. The food was an unconditioned stimulus and salivation was an unconditioned (innate) response.
The classic experiment done by Pavlov, in that experiment the food represents, which is known as the unconditioned stimulus (UCS). The UCS naturally and automatically triggers a response.
The unconditioned response is a response which is of reflexive and involuntary nature, and is reliably induced every time an organism comes across to biologically significant stimuli.
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The appearance of colonies of streptococcus pneumoniae is related to the presence or absence of:_________
The appearance of colonies of streptococcus pneumoniae is related to the presence or absence of a polysaccharide coat.
Streptococcus pneumonia's extracellular polysaccharide capsule, the most important virulence factor , helps to initiate infection by allowing the bacterium to adhere to host cells and cause inflammation, while also providing protection from the host's immune system. Griffith conducted his experiments with Streptococcus pneumoniae, a bacterium that causes pneumonia. Griffith worked with two strains of this bacterium called rough (R) and smooth (S).Pneumococci produce pneumolysin, which breaks down hemoglobin into a green pigment that can be observed as a large green zone surrounding S. pneumoniae colonies growing on blood-agar plates.
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In a humid-temperate climate such as that of pennsylvania or washington, dc, weathering breaks down granite to produce?
In a humid-temperate climate such as that of Pennsylvania or Washington, dc, weathering breaks down granite to produce Quartz sand, clay, and rust, that stay to help make soil, while some ions dissolve and wash away.
Weathering of granite in Pennsylvania or Washington DC or other places where abundant rain falls makes some things (clay, rust, and quartz sand) that stay behind to contribute to soil, and other things (soluble ions) that dissolve and wash away very quickly.
Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth. Water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. Once a rock has been broken down, a process called erosion transports the bits of rock and mineral away. No rock on Earth is hard enough to resist the forces of weathering and erosion.
Weathering is often divided into the processes of mechanical weathering and chemical weathering
Biological weathering, in which living or once-living organisms contribute to weathering, can be a part of both processes. Mechanical weathering, also called physical weathering and disaggregation, causes rocks to crumble. Chemical weathering changes the molecular structure of rocks and soil. For instance, carbon dioxide from the air or soil sometimes combines with water in a process called carbonation.Here is the complete question -
Q. In a humid-temperate climate such as that of Pennsylvania or Washington, DC, weathering breaks down granite to produce:
(a)Quartz sand and rust, that stay to help make soil, while aluminium, potassium and other ions dissolve and wash away.
(b)Quartz sand, clay, and rust, that stay to help make soil, while some ions dissolve and wash away.
(c)Diet Pepsi.
(d)Quartz sand and clay, that stay to help make soil, while iron and other ions dissolve and wash away.
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In what ways is human population ecology similar to and different from that of other organisms? why is it difficult to determine a carrying capacity for humans?
Human can regulate or control their fertility . Population are not limited according to the natural resources. The nutritional requirement of human are unique in the animal kingdom.
In humans , they are complex species we do not reproduce , consume resources and interact with our living environment uniformly.If human consume only what they actually needed then the earth could potentially support a much higher figure.
There are current limiting factors for growth of humans are pollution and land for agriculture. Carrying capacity is the level of production that does not impact undesirably on the surrounding ecosystem.There are four categories such as - physical. ecological, economic, and social carrying capacities.
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Two species cooperating to help each other is known as ____________.
A. Leguminism
B. Commensalism
C. Parasitism
D. Mutualism
Answer:
Mutualism
Explanation:
Mutualism is when two species work together to benefit each other. Like there are certain species of bird that sit on rhinos and eat pests/bugs on them, this benefits the bird cuz it gets food and it benefits rhino cuz it does not get bugged (pun intended)
Why is it important to maintain the ph of blood and tissue fluids within normal limits? check all that apply
Enzymatic and other proteinic activity is limited by pH. 2) Slight deviations from normal pH can shut down metabolic pathways. 3) The structure and function of macromolecules are pH dependent.
How does the pH levels affect enzymes and proteins?
Enzymes, like all proteins, are polypeptidic molecules.
They need to get an accurate tridimensional structure to accomplish their function.
There is a limit of temperature and pH level at which they lose that structure and denaturalize.
pH changes
The most accurate configuration for the best catalytic performance depends on the charge of the lateral chains and the environmental pH.
Enzymes have ionizable chemical groups in the lateral chains of their amino acids.
Depending on the environmental pH, these groups will have a positive, negative, or neutral charge.
There is an optimum pH level at which enzymes get the best configuration to accomplish their functions.
Most enzymes are sensitive to any change in pH, which might drastically affect their activity. So every enzyme has its optimum pH level, and any slight deviations will cause the enzyme denaturalization, hence, its activity loss.
Whenever the enzyme loses its configuration, and hence, its function, the whole pathway in which it is involved is interrupted.
Options 2 and 3 are correct.
Slight deviations from normal pH can shut down metabolic pathways. The structure and function of macromolecules are pH dependent.You can learn more about enzymes and pH at
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Why is it important to maintain the ph of blood and tissue fluids within normal limits? check all that apply
Most enzymes require an acidic pH to function properly. Slight deviations from normal pH can shut down metabolic pathways. The structure and function of macromolecules are pH dependent. Hormones require a blood pH of at least 77 to function, A drop in blood pH causes dehydrationThe pH balance plays an important role in the chemical makeup of the human body.
REASONS :
A pH balance simply means that the acid-base balance in the body is generally maintained. The body needs to stay in homeostasis (a stable state) to function optimally.
1.Slight deviations from normal pH can shut down metabolic pathways.
2. The structure and function of macromolecules are pH dependent.
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How does the loss of vegetation on shore lines affect waterways? a. decreased sedimentation b. increased shorelines c. increased erosion of water banks d. none of the above
c. increased erosion of water banks
Correct option is C. Waterways are affected by the loss of vegetation along the shorelines, which causes increased erosion of water banks .
By sustaining portions of the beach with its roots, vegetation on the shore protects the soil from erosion and decreases its impact.
Erosion would be detrimental without them.
What is erosion?The process of removing soil, rock, or dissolved material from one area on the Earth's crust and moving it to another, where it is deposited, is known as erosion.
Erosion can be brought about with the aid of many exceptional situations. Some erosion examples include wind erosion, water erosion, glacial erosion, temperature erosion, and mass wasting (such as landslides).
Erosion differs from weathering, which is a static process.
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when will natural selction occur
A. When there is competition
B. When there are unlimited resources
C. When there are no mutations in a species
D. When the population is very small
Natural selection will occur When there is competition.
Competition between living things is considered in Darwin's theory of the mechanism of evolution as a key component of the "fight for existence" and, consequently, as the foundation for natural selection.Members of the same species compete with one another within their own species. In the same location, for instance, two male birds of the same species can compete for mates. A fundamental element of natural selection is this kind of rivalry. It encourages a species' ability to evolve superior adaptations throughout time.The reduction of niche overlap when two species compete for the same finite resource may result in evolutionary changes in both species. Alternately, the competitively dominant species remains the same and may even be able to enlarge its niche, which limits the amount of available niche space.learn more about natural selection here: https://brainly.com/question/23929271
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The brain relies solely on ________ as its energy source. if it is deprived of this substrate, the cells soon die.
The brain relies solely on "glucose" as its energy source. if it is deprived of this substrate, the cells soon die because during the fasting state, proteins and fats are transformed to glucose.
What is glucose?The primary form of glucose in the body, glucose serves as the body's cells' main source of energy. Glucose can be produced by the body from other chemicals or it can be obtained from the meals we eat.
The bloodstream carries glucose to the cells. Insulin is one of many hormones that regulate blood glucose levels.
Some key points of glucose are-
The primary sugar in your blood is called blood sugar, or glucose. Your body uses it as its primary source of energy, and it originates from of the food you eat. All of the cells in your body receive glucose from your blood to be used as fuel.Diabetes is a condition in which you have too high blood sugar levels. Possessing too much sugar in your blood might have major consequences over time. You might occasionally experience issues with too low or too high blood sugar even if your don't have diabetes. Maintaining a regular eating, exercise, and medication regimen can assist.To know more about glucose, here
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this procedure for measuring cell size has certain limitations . List three such limitations
The limitations of cell size are:
1) Surface area to volume ratio
2) Nucleo cytoplasmic ratio
3) Fragility of cell membrane
What are the cause of limitations on cell size?
The need for a surface area of sufficient area to allow the cells function→.
→If the surface area of cell increase volume increase to the cube of the linear increase.
→ Nuclie contains information needed for protein synthesis . Some cells reduce this limitation to increase the no. Of nucleus called multinucleated.
Examples are muscle cells.
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Measuring cell size has specific limitations
Exterior area to volume ratio Nucleo cytoplasmic proportion The fragility of cell membraneThe key element that limits the size of a cell is the ratio of its surface area to its volume.
What limits the sizes to which cells can grow?
One statement is that cell sizes are limited by surface-to-volume ratios. Cells that are too large in volume may be determined by the rate at which nutrients are taken up, which in turn is limited by the cell's membrane exterior area.
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What hormone is synthesized from molecules of the neurotransmitter serotonin in the pineal gland?
Melatonin hormone is synthesized from molecules of the neurotransmitter serotonin in the pineal gland.
Melatonin is produced from Serotonin which is itself produced by Tryptophan through a series of linked enzymatic reactions.
Melatonin is a hormone produced in response to darkness by the Pineal gland. It helps to maintain the Circadian Rhythm of the body and the Sleep wake cycle.
It plays an important role in regulating the menstrual cycle in females and in integrating the photo periods as well.
It is secreted mainly at the night time.
It is also called as the hormone of Darkness.
Serotonin, on the other hand, is a neurotransmitter (chemical) that carries messages between the nerve in the brain and co-relating them throughout the body.
It plays vital role in sleep, digestion and sexual desire.
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the ability of an organ to adjust to changes in either its internal or external environments is called
Answer:
Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis (“steady state”). These changes might be in the level of glucose or calcium in blood or in external temperatures. Homeostasis means to maintain dynamic equilibrium in the body
Which part of the large intestine helps fight parasites that have survived the previous digestive tract?
Answer:
All parts of the Large Intestine
Explanation:
If a cell is unable to progress beyond the g1 phase it is a likely indicator that the cell:___.
If a cell is unable to progress beyond the G1 phase it is a likely indicator that the cell was unable to reach to an appropriate size and lacked nutrients and growth factors.
What are cell cycle checkpoints?Cell cycle checkpoints are various mechanisms which control the progression of cell from one stage of the cycle to next.G1 checkpoint is located at the end of G1 and progression to S phase. It checks whether the cell has grown to a specific size and has accumulated nutrients and growth factors.It is also an indicator that the environment is not appropriate for cell division.G2 checkpoint is present at the transition from G2 to M phase. It checks whether the DNA has replicated properly or is there any damage in the DNA.M checkpoint is for transition from Metaphase to Anaphase. It checks whether the chromosomes have properly attached to the spindle fibers at the metaphase plate.Learn more about cell cycle checkpoints here:
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When a single gene locus affects more than one trait, this is called ____________ .
When a single gene locus affects more than one trait, this is called
PLEIOTROPY
What is pleiotropy?It is known as "PLEIOTROPY" when a single locus affects two or more phenotypic qualities that are seemingly unrelated to one another. This phenomenon is frequently referred to as a single mutation that impacts two or more wild-type attributes. When two or more qualities reliably segregate with a particular mutation, that mutation is referred to as pleiotropic. The research of pleiotropic genes often involves evaluation of segregation patterns or, more recently, the mapping of mutant phenotypic traits to a single mutant locus.
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The ________ returns most of the venous blood from the heart to the right atrium.
The superior vena cava returns most of the venous blood from the heart to the right atrium.
The whole return of systemic venous blood goes to the right atrium. Either the inferior vena cava or the superior vena cava receives the majority of the blood. The superior vena cava receives systemic venous circulation, which includes blood from the head, neck, chest, shoulders, and upper limbs, from above an imaginary line drawn at the level of the diaphragm.
Most of the body above the diaphragm is drained via the superior vena cava. The axillary vein, which originates in the axillary area, goes through the body wall to produce the subclavian vein on both the left and right sides. The brachiocephalic vein is created when it unites with the external and internal jugular veins of the head and neck.
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During which process does mrna bind to ribosomes, allowing a protein to be made?
Answer:
Translation
Explanation:
During translation, mRNA arrives at a ribosome. Within the ribosome, the mRNA temporarily binds to tRNA's via complementation. The tRNA's are responsible for gathering the relevant amino acids and creating a new protein.
Evaluate your work by answering these questions: how did this activity help you understand the roles and priorities of the federal government during obama's administration? what would you like to know more about?
Obama's signature domestic legislative achievement was the Patient Protection and Affordable Care Act, known colloquially as "Obamacare."
What is obama's administration ?The general goals of the Obama Administration were to "revive the economy, provide affordable and accessible health care to all, strengthen our public education and social security systems, define a clear path to energy independence and tackle climate change, end the War in Iraq responsibly," among other things.
No matter who you are, where you are from, what you look like, or whom you love, President Obama has led the battle to safeguard everyone.Here is how the administration has performed in terms of advancing broad rights and protections for LGBT Americans, improving the fairness and security of our immigration system, combating poverty, and investing in communities.Learn more about Obama's administration here:
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Answer:
Answer on Edmentum
Explanation:
Branches of the pudendal nerve are anesthetized during childbirth before the doctor performs a/an?
Before a doctor conducts an episiotomy during delivery, branches of the pudendal nerve are put under anesthesia.
What is meant by an episiotomy?
During delivery, the membrane between the vaginal entrance and the anus is sliced, or an episiotomy is performed. The perineum is the name of this region.An episiotomy was long believed to lessen the severity of vaginal tearing after delivery. An incision was thought to heal more effectively than a spontaneous rip. Additionally, it was believed that the operation would aid in preserving the pelvic floor's supporting muscles and connective tissue.However, current evidence indicates that frequent episiotomies may not actually be effective in preventing these issues.Learn more about episiotomy here:
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Which of these organisms experience the highest rate of cellular respiration due to activity levels
A. Plants
B. Protozoa
C. Animals
D. Fungi
Answer: animals
Explanation:
Answer: It's Fungi.
Explanation:
A/an ____________________, which is also known as a stroke, is damage to the brain that occurs when the blood flow to the brain is disrupted by a blockage of the blood supply.
Answer: transient ischemic attack
Damage to the brain, when the blood supply to the brain is disrupted is caused by cerebral infarction, also a type of stroke due to the blood supply problem.
What is cerebral infarction?Cerebral infarction - A stroke caused by a disruption or obstruction in blood flow to the brain also known as an ischemic stroke. A stroke, also known as a brain attack, happens when blood flow to a portion of the brain is cut off or when a blood artery in the brain bursts.
Parts of the brain are injured or die in either circumstance. Brain death (also known as brain stem death) occurs when a person on artificial life support loses all brain functioning.
This implies they will not be able to regain consciousness or breathe without assistance, a brain-dead individual is legally declared dead.
Therefore blood supply to the brain is damaged by cerebral infarction also known as stroke.
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If a member of your family suddenly develops chronic hoarseness and seems to have difficulty swallowing along with recurring stomach aches, this could be an issue with which cranial nerve?
Hybridomas, which produce monoclonal antibodies, are made by fusing cells of the immune system with.
Hybridoma cells resulting from the fusion of B lymphocytes and myeloma cells produce specific monoclonal antibodies.
A popular technique for creating monoclonal antibodies is hybridoma technology. After immunising mice with a particular antigen, antibody-producing B lymphocytes are extracted from the animals and united with immortal myeloma cell lines to create hybrid cells, also known as hybridoma cell lines.
What is Immune system ?A vast network of organs, white blood cells, proteins (antibodies), and chemicals make up your immune system.
Together, these components of your body's defence system guard you against external invaders (bacteria, viruses, parasites, and fungus) that can lead to illness, disease, and infection.A weakened immune system can momentarily be brought on by treatments like anticancer therapies and radiation therapy, despite the fact that it is primarily brought on by certain illnesses, starvation, and specific genetic problems.Learn more about Immune system here:
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What structures/ property of the heart in the heart (cardiac muscle) prevents the heart from having tetany?
Which of the following is a possible function of a protein?
A. Providing long-term energy storage
B. Insulating organisms
C. Storing genetic information
D. Sending signals across the organism
Answer:
C
Explanation:
Answer:
The correct answer is D, Sending signals across the organism.
Explanation:
After drying off a newborn he has a weak cry and poor muscle tone. what should you do?
We can give a blow by oxygen, so that babies can exchange air and the supplemental oxygen will during post birth.
What is Apgar test?
Baby's first cry will give a signal that his lungs work properly or not.
Similarly, hypotonia is condition of low muscle tone of baby after birth, and the symptoms include limp in arms.
These conditions can be diagnosed by Apgar test consist up one minute test and five minute test, tells about the entire birthing journey of a baby .
In this test, baby's color, respiratory effort, heart rate, muscle tone are detected and the maximum total score is ten, if baby get a score between 4 and 4, need assistance for breathing.
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Environmental and cultural factors don't affect someone's level of learning or academic performance that much. please select the best answer from the choices provided t f
It is false that environmental and cultural factors don't affect someone's level of learning or academic performance that much.
Cultural mores can cause conflict between various cultural groups.The setting in which an action is acceptable is influenced by culture.How environmental and cultural factors influence learning?The social environment has an impact on learning by providing a kid with a language and experience-rich setting that stimulates cognitive development, as well as by consistently rewarding them for learning.Cultural factors that might influence are:
Socialization during childhoodSociocultural closeness Ecological adaptationBiological consequencesLanguage are among the factors.Learn more about cultural factors here:
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What is the source of carbon for terrestrial plants? terrestrial plants acquire carbon from the .
During this process, plants cleave the carbon from the two oxygen molecules and terminate the oxygen back into the surrounding circumstances.
What is terrestrial plants?In terrestrial communities, plants transform atmospheric carbon dioxide into carbon-based combinations through photosynthesis (see above The photosynthetic operation). During this process, plants cleave the carbon from the two oxygen molecules and terminate the oxygen back into the surrounding circumstances.Many terrestrial manufacturers are not even helophytes but rainforest species that tolerate occasional inundation. Examples of these types of plants contain Syngonium, Philodendron, Adiantum, Aglaodorum, Aglaonema, Cordyline, Ophiopogon, and Physostegia.Terrestrial manufacturers are defined as any manufacturer that grows on, in, or from the land. By contrast, aquatic plants are manufacturers that thrive when their roots are submerged in moisture.To learn more about terrestrial plants, refer to:
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Anatomically modern human fossils were discovered in the european upper paleolithic site of group of answer choices cro-magnon, france. atapuerca, spain. petralona, greece. mauer, germany.
Anatomically modern human fossils were discovered in the First European Upper Paleothilic Site was Atapuerca, Spain.
Following are some facts related to the discovery:
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A function of protein is to help maintain fluid distribution within the body by?
Function of protein is to help maintain fluid distribution within the body by Attracting water into compartments where it is needed.
Protein function by attracting water into the compartments with the help of Aquaporins.
Aquaporins regulate the flow of water into and out of the cells. For the proteins that float freely in a cell, the attraction is dependent on the arrangement of water molecules.
Aquaporins are integral membrane proteins serving as a channel for water transfer. They are present in the biological membranes. They form water channels and allows movement of water.
Proteins are water loving i.e. hydrophilic.
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