The reproductive isolating mechanisms are prezygotic or postzygotic both depending on the situation what the scenario is but mostly it is prezygotic.
Prezygotic barriers are reproductive barriers that prevent mating between species or hinder fertilization if mating occurs. Examples of prezygotic isolating mechanisms include geographical isolation, behavioral isolation, temporal isolation, and mechanical isolation. Postzygotic barriers are reproductive barriers that prevent hybrid offspring from surviving and reproducing. Examples of postzygotic barriers include hybrid inviability, hybrid sterility, and hybrid breakdown. Postzygotic effects are the evolutionary effects that result from the mating of two individuals of different species, resulting in hybrid offspring. These effects include changes in the phenotype, behavior, and fitness of the hybrid offspring, as well as changes in the gene frequencies of populations. Postzygotic effects can affect populations in a variety of ways, including changes in population size, structure, and dynamics.
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Typically, a lymphocyte will encounter its first exposure to a foreign antigen in the:
Red bone marrow
Yellow bone marrow
Thymus gland
Secondary lymphatic structures
A lymphocyte will encounter its first exposure to a foreign antigen in the Red bone marrow.
What does having low lymphocytes mean?These cells aid in defending your body against illness. You are more vulnerable to infection if you have an inadequate amount of lymphocytes (lymphopenia). Lymphopenia symptoms vary in severity depending on how severe the condition is and how long it has persisted. Some individuals show no symptoms.Most animals have lymphocytes as a sort of white blood cell in their immune systems. Natural killer cells, T cells, and B cells are examples of lymphocytes. They are the primary class of cells in lymph, thus the term "lymphocyte." Between 18% and 42% of the white blood cells that are in circulation are lymphocytes.
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Pathogenic bacteria are likely to multiply rapidly when environmental temperatures are between.
Answer:
20 + 40
Explanation:
they stay in an envelope which has a relative cool weather
the myelin sheath along an axon is not continuous. what are the gaps between schwann cells called?
The gaps or spaces in-between Schwann cells are referred to as nodes of Ranvier.
The nodes of Ranvier are a term used to describe each space between internodes in the myelin sheath. Positive sodium ions are prevalent in the nodes of Ranvier. The electrical signal or impulse bounces between nodes as it moves through the axon. The sodium ions refresh the electrical signal as it crosses the gap, allowing it to continue traveling without losing its charge or weakening in signal power.
Electrical transmission on nerve cells is delayed or halted when the myelin sheath is compromised. When the immune cells in your body mistake myelin for a foreign material, myelin might suffer harm. Your symptoms are based on where the myelin is damaged. Demyelination is the term for the loss of the myelin sheath.
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The myelin sheath along an axon is not continuous. Between Schwann cells are gaps called:
A. Collaterals
B. Axon hillocks
C. Nodes of Ranvier
D. Axon terminals
What color is rare in nature as a pigment, most often occurring as a structural color?
Blue is extremely uncommon in nature, though. Blue flowers only appear on fewer than one in ten plants, and blue creatures are far rarer.
How come then?
As a result, both plants and animals must use optical illusions to appear blue. This is partly because there isn't really a true blue pigment or colour in nature. In the lapis lazuli substance, which is mostly mined in Afghanistan and gives the uncommon blue hue ultramarine, trisulfide ions are present, which are three sulphur atoms bound together inside a crystal lattice. One electron can be bound or released by these ions.
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How does a negative feedback
loop maintain homeostasis?
A. it creates an external response
B. it works to bring the body back to the target of
stability
C. it moves the characteristic above normal
limits
D. it creates an increase in product of a reaction
Negative feedback helps to keep a variable within its regular range and lessens an overreaction.
How does unfavourable criticism work and what is it?
Negative feedback occurs when an output of a system, process, or mechanism is given back in a way that aims to reduce oscillations in the output, whether these oscillations are caused by changes in the input or other disturbances.
What possible repercussions could negative feedback have?
Because the feedback energy (voltage or current) is out of phase with the input signal when there is negative feedback, the input signal opposes the feedback energy. Negative feedback reduces the amplifier's gain. It also reduces distortion, noise, and instability. The bandwidth is increased while the input and output impedances are improved by this feedback.
Become familiar with Bandwidth.
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Answer: B
Explanation:
12. A child has a mass of 2.7 kg. Find his/her approximate weight in N
Answer:
Given:-Mass(M)=2.7 K.g
TO FINDweight = ?
Formulaweight = Mass × gravity
We know gravity (g) = 9.8 m/s²
CalculationSo weight (w) = 2.7 k.g× 9.8 m/s²
= 26.46 Newton
[tex] [/tex]
Thank you
The area between the presynaptic nerve cell and the postsynaptic muscle cell is termed the synaptic cleft.
T or F
The synaptic cleft is the name for the tiny space that exists between the membrane of the postsynaptic cell and the axon terminal of the presynaptic neuron. Thus this statement is true.
What is the synaptic cleft ?A synapse, or space where two neurons connect to one another, is called a synaptic cleft. Pre-synaptic neurons are attached to one side of it, and post-synaptic neurons are attached to the other. There is always an axon terminal on the presynaptic neuron.
Synaptic cleft refers to the area between two neurons where a neurotransmitter transmits an impulse. Presynaptic neurons and postsynaptic neurons are the two types of neurons that deliver and receive information, respectively.
These signals can also be modified through the synaptic cleft, such as by lengthening or shortening the signal's duration or adding more than one signal. The synaptic cleft's chemical makeup enables signal modulation, summarization, and a high degree of control rather than the straightforward on/off switch that is typical of electrical impulses.
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Some plants have stems called that grow along the ground, while fungi have hyphae that grow underground. These plant stems are involved in and hyphae are involved in. Both of these structures help the organisms.
Answer:
1. Runners2. Nutrient distribution3. Nutrient absorption 4. Reproduce
Explanation:
Answer:
As the guy above said, 1: runners, 2: nutrient distribution, 3: nutrient absorption, and 4: reproduce.
Hope this helps!
Explanation:
Where would you expect to see the ligand binding site of a neurotransmitter-gated ion channel protein?.
Transmembrane ion channels known as ligand-gated ion channels open or shut (controlled passage) in response to the interaction of a chemical signalling agent such as a ligand.
An essential family of plasma membrane proteins known as ligand gated ion channels (LGIC) mediates cell-cell communication and cellular excitability. The electrically excitable cells like neurons are a fairly typical location to discover ligand-gated ion channels.
Ligand-gated ion channels (LGICs) are membrane proteins that are structurally integral and feature a pore that permits the controlled passage of certain ions across the plasma membrane. The electrochemical gradient for the permeant ions drives the passive ion flow.
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How does CO2 affect the rate of photosynthesis?
Answer:
CO2 affect the rate of photosynthesis because the increased of the amount of carbon dioxide increase photosynthesis, spurring plant growth.
if fossil fuel burning rates dont change, predict how this will impact the carbon cycle and global climate change by the year 2070.
Answer:
firstly fossil fuels are non renewable source of energy so It will eventually run out but untill then the prixe of fuel will keep rising
secondly the amount of fossil fuel burned will affect the carbon cycle which will lead to major climate change in the future if the use of fossil fuel stays the same
1.lead to increase in global temperature
2.sea level will rise
3.animals won't be able to adapt to the quick change leading to endangerment and extinction
4. both human and animal health will be greatly impacted
what types of calculations can you do regardless of whether or not a question tells you that the population is in hwe for a given gene?
Regardless of whether we are in a situation subject to the population being in HWE or not, the genotype frequencies can be used to calculate the allele frequencies.
What is The Hardy-Weinberg Equation (HWE)?The Hardy-Weinberg equation states that the frequency at which a specific genotype occurs can be expressed as a ratio of the genotype in question to the total number of alleles in the population.
Algebraically, the equation is expressed as:
p² + 2pq + q² =1
The terms of this equation are defined as follows:
p = the frequency of the dominant allele in a population
q = the frequency of the recessive allele in a population
2pq = the frequency of the heterozygous dominant genotype
p² = the frequency of homozygous dominant genotype
q² = the frequency of homozygous recessive genotype
Because the set of all alleles in the population is made up of one part dominant alleles and one part recessive alleles, the sum of p and q will always equal 1.
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Which statement describes the process of subduction?
Convection currents cause two plates to move away from each other.
A plate slides beneath another plate due to convection currents and gravity.
Materials are heated and transferred within Earth’s interior by density.
Heat cycles in the mantle cause plates to constantly move.
Answer:
A plate slides beneath another plate due to convection currents and gravity :)
Example:
At a destructive plate margin, two plates move towards each other (oceanic and continental). The oceanic plate is denser, and subducts
Answer: the first one i did the
Explanation:
Please help! 100 points
Answer:
Produces genetically identical to parents
Explanation:
Yesterday i saw thousands and thousands of frog egg in the pond. The frogs _ of their offspring is incredible !
A. biology
B. genetic variation
C. organism
D. population
E. species
F. environment
G. offspring
H. overproduction
i. reproduction
The frogs genetic variation of their offspring is incredible.
Life cycle of frogs:The process begins when adult frogs deposit hundreds of small eggs, known as frogspawn, that collect together in clusters. Early in the spring, as the temperature is just beginning to warm up, this occurs.
Tadpoles won't move around much for the first week or two after hatching since they are still taking nutrition from the yolk of their egg. But once the yolk is completely consumed, the tadpoles are large and robust enough to enter their aquatic environment.
Frogs and toads depend on water significantly less as adults. They can live on land as long as they stay in the shade and don't dry up, but they frequently go back to ponds and lakes for a splash.
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a man with a blood type marries a woman with b blood type. a. can they have a child with o-type blood? explain.
When a man with blood type A marries a woman with blood type B, they can have a kid who has blood type O.
What is a blood group type?a method for classifying distinct kinds of human blood according on whether or not the red blood cells' surfaces contain certain markers. Blood comes in four different types: A, B, O, and AB.
A kid with the blood types A, B, AB, or O can result from having an A parent and a B parent. If one parent has blood type A and the other has blood type AB, the kid will either have the blood type A, B, or AB. If one parent has blood type A and the other has blood type O, the kid will either have blood type A or O.
If a man with type A blood marries a woman with type B blood. Their child is blood type O, reason is the genotypes of the parents will be AO and BO.
Thus a man with A blood type marries a woman with B blood type can produce o type blood child.
diagram is shown
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The method for determining exercise intensity by estimating it without measuring it is called rating of.
Answer:
The RPE scale is used to measure the intensity of your exercise.
Explanation:
science!
what did the discovery of neanderthal dna in modern human genomes tell us about gene flow as homo sapiens emerged from africa?
Although a small amount of variety has been passed down from Neanderthals, most human variation is derived from what was present in the population of homo sapiens that initially appeared in Africa.
Genes are a good illustration.Your skin and hair colors, among other characteristics, are influenced by the genes you inherit. The possibility exists that Emma's mother possesses two genes—one for brown hair and one for red hair—and may have given her one of them.
Relevance of genesThe formation and operation of your cells are governed by the instructions found in your DNA. The building blocks of the body are cells. A billion cells work together to form every component of your body. Chromosomes are the structural elements that hold genes in place.
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what population control strategy has a big impact on population growth without infringing on people's rights to reproduce?
The population control strategy that greatly impacts population growth without infringing on people's rights to reproduce is replacement fertility practices by individuals.
The strategy or technique used to manage and maintain the types, locations, and numbers of people who populate the planet is known as population control. Over the course of a century, quality and status of life have drastically changed. We owe this to the world's inventive and cutting-edge technologies. Modern technology has several effects on the economy, including a decline in mortality and an increase in birth rate. One of the most hazardous issues currently plaguing the planet as a result of this is the population boom. India has seized its place among the most powerful nations. Everything has advanced to a new level, including the economics, status, and way of life. India has the largest population of this race. India now has 12 times as many people as it did when it gained freedom. Should this be stopped? Yes, but how? India was the first nation to implement a population policy, now known as the First Five Year Plan, in 1952 with the intention of containing the population expansion, but it was unsuccessful. The government later developed more practical strategies to manage the population boom by the 1970s. These included the Medical Termination of Pregnancy Act (1971), slogans for birth control on posters and bills, the marriage age requirement, contraception, etc.
Hence, population control strategy maintain population in equilibrium.
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the duodenum contains these structures whose products neutralize the acidic material from the stomach.
The duodenum and stomach are divided by the pyloric sphincter. Pancreatic fluids, an alkaline mixture rich in bicarbonate, are mixed with stomach chyme to balance its acidity.
What part in the body does the duodenum play?The small intestine begins in the duodenum. The major function of the duodenum is to complete the initial stages of digestion. Food from the stomach is combined with bile from the gallbladder and other substances in this area of the intestine.
What issues could develop in the duodenum?Dyspepsia or epigastric discomfort, anorexia, obstructive symptoms, early satiety, nausea, vomit, & weight loss are all symptoms that patients with duodenal lesions exhibit. Long-term sickness raises the chance of duodenal cancer, which can manifest as inflammatory lesions, prohibitions, and fistulas.
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corona viruses are approximately 0.5micm in diameter how many coronaviruses could fir across a water froplet that was 1cm across
Number of corona virus that can be fitted into one water droplet is 39990
The volume of a sphere is the amount of space occupied inside the sphere. A sphere is defined as a three-dimensional round solid with all points on the sphere equidistant from the center. The fixed distance is called the radius of the sphere and the fixed point is called the center of the sphere.
Explanation:
1 mm is equals to 1 x 10-4 cm
Given, the diameter of corona virus is 0.5 mm i.e equals to 5 x 10-5 cm
Assuming corona virus is spherical in shape, volume of one corona virus is
Volume(c)=[tex]\frac{4}{3} \pi r^{3}[/tex]
Where, r is the radius of virus = diameter of virus/2
= 5 x 10-5 / 2 = 2.5 x 10-5
Putting value of r in above equation,
Volume(c)=[tex]\frac{4}{3} \pi (2.5*10^{-5}) ^{3}[/tex]
= 0.0001047 cm3
Now we have to calculate volume of one water droplet. We have diameter of water droplet is 1 cm . So volume will be
Volume(w)=[tex]\frac{4}{3} \pi (1) ^{3}[/tex]
= 4.187 cm3
Number of corona virus that can be fitted into one water droplet is Volume of one water droplet / volume of one corona virus = Volume (W) / Volume (C) = 4.187/ 0.0001047 = 39990.448 = 39990
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vibrations from the tympanic membrane to the oval window are transmitted by the structures at which numbers?
The 3 and 4 are the structures at which the tympanic membrane to the oval window are communicated.
An example of a tympanic testHow well your middle ear is functioning is determined through a test called tympanometry. By tracking the motion of your eardrum, it does this. The outer ear, middle ear, and inner ear are all separate structures that make up your ear. You receive sound as energy or vibrations through your outer ear.
The tympanic bone's location is unknown.The temporal bone's tympanic portion, which surrounds the external portion of the ear canal, is a curving plate of bone that sits under the squamous portion, in front of the mastoid process.
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considering how it is transmitted, which would be the most effective preventive measure against lyme disease among a stable of racehorses?
The most effective preventive measure against Lyme disease among a stable of racehorses is Spraying down the stables regularly with an insecticide designed for ticks.
After removing the tick Abigail Bartholomew begins on antibiotics. Abigail worries that an open wound from a tick will lead to sepsis. The vascular system also called the circulatory system consists of blood vessels that carry blood and lymph throughout the body.
Arteries and veins carry blood throughout the body deliver oxygen and nutrients to the body's tissues and remove waste products from the tissues. Although many young animals can die the disease is usually not fatal in adult animals. However, it causes severe pain and suffering, especially in cattle. Animals can become permanently lame and recovering animals can be less productive.
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Question 14
Which stage of the water cycle is most like respiration in the carbon cycle?
A. Runoff removes water from the atmosphere like respiration removes carbon from the atmosphere
B. Condensation removes water from the atmosphere like respiration removes carbon from the atmosphere
C. Evaporation returns water to the atmosphere like respiration returns carbon to the atmosphere
D. Precipitation returns water to the atmosphere like respiration returns carbon to the atmosphere
Answer: B. Condensation removes water from the atmosphere like respiration removes carbon from the atmosphere
Explanation: To be able to answer this question to the best ability, we first need to know what respiration in the carbon cycle is. Respiration in the carbon cycle is when animals and plants get rid of the carbon dioxide gas. So, we know that respiration is the process of getting rid of carbon dioxide right? That means that C and D can not be correct! That leaves us with A. and B. Option A cannot be correct because runoff does not remove water from the atmosphere, so, the correct answer must be B!
In 1839, Schleiden and Schwann began formulating a theory of cells and their role in living organisms. Over time, cell theory has been updated. Modern cell theory is summarized below.
Answer: The modern cell theory are in following ways:-
(1) All known living things are made up of one or more cells.
(2) All living cells arise from pre-existing cells by division.
(3) The cell is the fundamental unit of structure and function in all living organisms.
(4) The activity of an organism depends on the total activity of independent cells.
(5) Energy flow (metabolism and biochemistry) occurs within cells.
(6) Cells contain DNA which is found specifically in the chromosome and RNA found in the cell nucleus and cytoplasm.
(7) All cells are basically the same in chemical composition in organisms of similar species.
Explanation:
Place the items in order from highest to lowest degree of internal organizatio
tissue
organ system
organ
Cell
The items are listed in order of internal organization, highest to lowest. Organ system follows cell, tissue, organ, and organ.
What is the proper hierarchy for an organ system's organization?Multicellular organisms are made up of cells, tissues, organs, and organ systems, which are composed of groups of similar cells, tissues, organs, and organ systems.
What aspect of a tissue is least organized?At the lowest level of structure, cells are the most fundamental component of life. Prokaryotic cells lack a nucleus, while eukaryotic cells have nuclei (with nucleus). Connective, muscular, epithelium, and nerve tissues are the four types of tissues. Organs are formed of several tissue types and carry out intricate tasks.
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What caused the changes to the form of the embryo?
Which body systems within marching band members are interacting so they can play their instruments while walking in the parade? List the systems below.
Which of these factors does cites fail to consider when determining which species to cover?.
The sustainability of the Ecosystem is the factor that CITES neglects to take into account when choosing which species to cover. A biological setting with several habitats that are capable of thriving and supporting itself independently is referred to as a sustainable ecosystem.
The biosphere can meet the needs of the current generation without compromising the ability of future generations to meet their own needs.
Sustainability is essential for many reasons, including Environmental Quality - Healthy communities require toxic-free environments, clean air, and natural resources. Growth - As UNTHSC's enrollment keeps expanding, we need additional space, energy, and water.
Thus, we can conclude that CITES fails to consider the sustainability of the ecosystem when deciding which species to include in its list of protected species.
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Your question is incomplete. Please find the complete question below.
Which of these factors do CITES fail to consider when determining which species to cover?
a.Species population
b.Economic impact
c.Analysis of trade
d.Ecosystem sustainability
Where is the center of the anatomic origin of the anterior talofibular ligament on the fibula?.
Answer:
Hope this helps!
Explanation:
The fibular origins of ATFL and CFL are concentrated in the lower part of the lateral malleolus and connected with connective fiber [18]. Also, ligament injury is likely to occur at the fibular side or substantial part of the ligament [4, 6]