Coues deer that live in the American Southwest and northern Mexico are cut off from each other by an impenetrable fence, and as a result, they can no longer interbreed and give birth to fertile offspring. This is a prime illustration of allopatric speciation.
When a species divides into two distinct groups that are isolated from one another, allopatric speciation takes place. They can't breed with one another because of a physical barrier, such a mountain range or a waterway. Based on the requirements of their particular habitat or the genetic traits of the group that are passed on to offspring, each species grows differently.
Hence, Coues deer development into distinct species is example of allopatric speciation.
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Tetrodotoxin binds to sodium channels and blocks the passage of sodium ions. Based on this information, which symptom would most likely occur in an organism exposed to tetrodotoxin?
A.
paralysis due to lack of action potentials to signal muscle tissue
B.
blindness due to proteins in the eyes denaturing and losing functionality
C.
decreased appetite due to the production of hormones that indicate fullness
D.
increased heart rate due to increased nerve impulses to the heart muscles
Paralysis owing to a lack of action potentials to signal muscular tissue would be the tetrodotoxin exposure symptom that would most likely manifest in an organism.
The correct answer is A
Can you recover from tetrodotoxin?The toxicity of a fish is another issue. The liver and ovaries of silver-cheeked toadfish contain tetrodotoxin, as do other organs. An adult human can be killed by this potent neurotoxin at doses as little a two milligrams when it is pure. Compared to cyanide or arsenic, it is a much more powerful poison.
Exists a treatment for tetrodotoxin?No known remedy exists. Supportive care and respiratory support are the mainstays of treatment up until the tetrodotoxin was eliminated in the urine. If a patient shows up within 60 minutes of consuming anything, activated charcoal and/or gastric lavage may be performed.
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3. A small spider mite species has populations on several islands in the South
Pacific. They live inside coconuts and exclusively eat smaller insects on the outer
husk of the coconuts. During heavy storms, coconuts containing the spider mites
can be carried from one island to another where the mites successfully breed with
members of the same species on the new island. This is an example of -
A Bottleneck
B Mutation
C Gene flow
D Gene recombination
This is an example of - B Mutation
What principle underlies the notion of evolution?
Populations and species of organisms change through time; this is the fundamental tenet of biological evolution.
Genetic variations that are advantageous to an individual's survival are passed on through reproduction under natural selection. New organisms born as a result have a higher chance of surviving and reproducing.
Reproduction, heredity, variation in organism fitness, and diversity in individual traits among population members are the four prerequisites for natural selection to take place. Natural selection takes place automatically if they are met.
Variation, inheritance, selection, and time are the four principles that drive evolution. These are viewed as being part of the natural selection-based evolutionary system.
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Neha's mother is making vegetable pickle. She does the following. Step 1 - cuts the vegetables into small pieces Step 2 - soaks the vegetables in water for sometime Step 3 - mixes the vegetables with spices Step 4 - stores the mixture in a cool dark place One of these steps may cause the pickles TO SPOIL. Which step is it likely to be?
Answer:
Step 4 will spoil the pickle
which antibacterial medication is commonly given to treat antibiotic-associated pseudomembranous colitis due to clostridium difficile
Vancomycin or fidaxomicin is commonly given.
What is pseudomembranous colitis?
Intestinal inflammation is brought on by the Clostridium difficile bacteria.
The disturbance of normal, healthy bacteria in the colon, frequently as a result of antibiotics, leads to Clostridium difficile colitis. C. Additionally, spores can spread difficile from one person to another. The colon may suffer serious harm, and it might even be fatal.
Diarrhea, stomach ache, and fever are among the symptoms.
Antibiotics are used in treatment. The infection may return despite antibiotic treatment. Surgery or a fecal transplant may be required in rare circumstances.
Vancomycin or fidaxomicin (Dificid) is most frequently utilized, depending on your condition. Metronidazole (Flagyl), which is an alternative if these medications are unavailable or cannot be tolerated, can be utilized.
Your doctor might advise a vancomycin enema or oral vancomycin combined with intravenous metronidazole for severe disease.
Hence, vancomycin or fidaxomicin is commonly given to treat antibiotic-associated pseudomembranous colitis due to clostridium difficile.
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b. excluding the possible rare polycistronic message, how can a single mrna molecule in a eukaryotic cell produce proteins with different activities?
A single eukaryotic gene can give rise to multiple different proteins due to alternative slicing mechanisms and different promoters.
What is eukaryotic gene?A typical eukaryotic gene consists of a series of sequences found in the mature mRNA (called exons) interrupted by introns. Intergenic regions are also not expressed, but they help chromatin assembly and may contain promoters.Eukaryotic gene is linear, condensed into chromosomes by histones, and telomeres at both ends to protect it from decay. Prokaryotes contain circular DNA in addition to smaller transmissible DNA plasmids.Eukaryotic gene consists of mitochondrial DNA in addition to nuclear DNA. Unlike prokaryotic cells, eukaryotic gene can regulate gene expression at different levels. Eukaryotic gene expression begins with controlling access to DNA. This form of regulation, called epigenetic regulation, occurs before transcription is initiated.To learn more about eukaryotic gene from the given link :
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Which of the following muscle does not form part of the rotator cuff? supraspinatus infraspinatus teres major teres minor'
Answer: The Teres major muscle i snot part of the rotator cuff, although it is frequently confused with other muscles in the rotator cuff
Explanation:
Cellular respiration is balanced by photosynthesis; the two processes work together to maintain the cycling of carbon and oxygen among earth systems. What describes the roles of carbon dioxide and water in these two processes?.
The statement that best describes the roles of carbon dioxide and water in these two processes is as follows:
Carbon dioxide and water are the reactants of photosynthesis and the products of cellular respiration.
Green plants and certain other species employ the process of photosynthesis to create food from carbon dioxide and water with the help of sunlight. In most cases, the green pigment chlorophyll is used in photosynthesis in plants, which produces oxygen as a byproduct.
Plants absorb water and carbon dioxide from the air and soil during photosynthesis. Water is oxidized, which means it loses electrons, while carbon dioxide is reduced, which means it receives electrons, inside the plant cell. Water is converted into oxygen and carbon dioxide into glucose as a result.
A biological process known as cellular respiration is one in which, in the presence of oxygen, a kind of sugar known as glucose is converted into energy in the form of ATP. This effort is necessary to complete metabolic activities.
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Help with question 3 and help fill out the list. The gizmo is called Cell Types
All mentioned cells are eukaryotic and all have a membrane-bound nucleus, cell membrane, mitochondria, endoplasmic reticulum, Golgi apparatus, vesicles and vacuoles, ribosomes, lysosomes, peroxisomes, cytoplasm
What are cell organelles?Cellular components are called organelles. These cellular organelles include both membrane-bound and non-membrane-bound organelles that exist within the cell and differ in structure and function. They coordinate and function efficiently for the normal functioning of cells. Some of them function by giving shape and support, while others are involved in cell migration and regeneration.
For the given data;
Mouse skin, fly muscle are animal cells that contain the following organelles: nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, vesicles, and vacuoles, ribosomes, lysosomes, peroxisomes, cytoplasm, and cell membrane.
Maple leaf and elodea are plant cells containing the following organelles: mitochondria, a nucleus, ribosomes, smooth and rough ER, Golgi body, lysosomes, peroxisomes, cytoplasm, and a cell membrane.
Fungus cells contain the following organelles: nucleus: endoplasmic reticulum (ER), mitochondria, Golgi apparatus, secretory vesicles, and vacuoles.
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In the gal gene system, which protein binds to the activation domain of the activator protein, ultimately blocking transcription in the absence of galactose?.
GAL80 binds to the activation domain of the activator protein, ultimately blocking transcription in the absence of galactose.
What is GAL system?
The GAL4-UAS system is a biochemical method used to study gene expression and function in organisms such as the fruit fly (Drosophila).
The GAL genes provide a closely regulated system in which to study gene-specific chromatin structure. GAL structural genes are inactive without galactose but are highly transcribed in its presence; the expression patterns of the regulatory genes can account for many of the features of GAL structural gene control.
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describe the events that occur from the time a motor neuron releases acetylcholine at the myoneural junction until muscle cell contraction occurs
The events that occur from the time a motor neuron releases acetycholine at the myoneural junction until muscle cell contraction trigger the occurence of the action potential.
The permeability of the cell membrane at the motor end plate is altered by the release of acetylcholine by the motor neuron at the neuromuscular junction. An action potential is set off by the change in permeability, which permits the inflow of positive charge.
The action potential permeates the entire surface of the muscle fibre and travels through the T tubules to the interior. A contraction begins when the amount of calcium ions in the cytoplasm (which have been released from the sarcoplasmic reticulum) increases. When AChE removes the ACh from the motor end plate and synaptic cleft, the contraction comes to an end.
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Identify this instrument.
A. Microscope
B. Refracting telescope
C. Reflecting telescope
D. Radio Telescope
Answer:
B. Retracting Telescope
the answer is: B. Refracting telescope
5. Social support can
Select one:
a. reduce blood pressure
b. prevent infections
c. reduce circulating stress hormones
d. all of the above
Social support can reduce blood pressure, prevent infections, reduce circulating stress hormones.
The importance of social support was greater for those with higher blood pressure. Men in their middle years and older adults who do not live with their wives may be especially at risk for hypertension. Participation in neighborhood organizations may lower these people's blood pressure.
What about social support?Social support appears to act as a buffer, lowering or stopping physiological reactions to stress. Lifelong social buffering takes place. Stress hormones can be any of the following, but not just: The primary stress hormone in humans is cortisol. norepinephrine and adrenaline are examples of catecholamines. Vasopressin. Don Drennon-Gala and Francis Cullen, both of whom took inspiration from a variety of theoretical traditions, published works that gave rise to the social support theory. The core tenet of the idea is that the possibility of crime and delinquency is decreased by instrumental, informational, and emotional assistance. Received support, often referred to as enacted support, describes particular supporting activities (such as counsel or reassurance) provided by providers during critical periods. Additionally, structural support or functional support can be used to quantify social support. Social exclusion, unpleasant marriages or partnerships, anxiety brought on by major life changes (such as the loss of a spouse, retirement, or change in living situation), socioeconomic disadvantage, and age, racial, or sex discrimination are some examples of social stressors.Learn more about social support here:
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Plants have cells, tissues, organs, and systems that allow them to function as complete organisms. Which parts of a plant function as an organ?.
The organ-like function of leaves makes them a part of a plant.
What is the main function of plants?Find out why plants use photosynthesis, respiration, and transpiration. Plants are significantly different from other species due to their autotrophic lifestyle (self-feeding). Autotrophs are able to synthesize their own sustenance from inorganic materials through a process known as photosynthesis.In addition to using photosynthesis to create food and oxygen, plants actively absorb carbon dioxide from the environment. This is a crucial function for the natural carbon cycle because it enables the recycling of carbon. Animals in the wild can also find shelter and safety in plants.The stamen and pistil, which are essential parts of a flower, carry out the process of seed formation. If the stamens and pistils are both functioning, a flower is said to be perfect.To learn more about function of plants refer to:
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What are 5 major events in Animal Farm?.
5 major events in Animal Farm are; Windmill - 5 year plans, Major's Skull - Lenin's body ,Battle of the Cowshed - Russian Revolution ,Animal Executions - Stalin's purge, Battle of the Windmill - WWII.
What were the most important events in Animal Farm?
The animals bravely repel a human attempt to retake the farm, which is dubbed "The Battle of the Cowshed." Napoleon leads the animals in the construction of a windmill. Napoleon reduces animal rations and rights and begins breaking the commandments.
What battles happened in Animal Farm?
Animal Farm by George Orwell is an allegory that represents the rise of the Soviet Union and uses the Battle of the Cowshed as the climactic battle between the animals and Manor Farm owner Mr. Jones to represent the Russian Civil War.
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which of the following is an accurate description of what happens in a cell during metaphase i? select one: crossing over occurs homologous chromosomes line up in the middle of the cell the nuclear envelope breaks up sister chromatids separate and migrate to opposite poles
In metaphase I the chromosome tetrads align or line up in the middle of the cell.
The first stage of the meiotic cell division cycle is known as metaphase I. It is a crucial stage since it decides how many chromosomes each daughter cell will have. The sister chromatids, which are each cell's two copies of a chromosome, migrate in opposite directions during metaphase I.The lining-up phase of metaphase I in meiosis I moves rather quickly. At the metaphase (or equatorial) plate, which is a pair of chromosomes with four chromatids (2 originals, 2 copies), tetrads or bivalents are arranged in a straight line. This plate is a hypothetical centre line along which the chromosomes are positioned; it does not actually exist.Each pair's particular chromosome stays close to its companion and stacks one chromosome on top of the other. One chromosome will eventually migrate to one pole and the other to the opposing pole as a result of this. Furthermore, it is irrelevant which way these chromosomes are oriented horizontally in relation to this hypothetical line. Either parent's DNA may be on either side of the cell.To know more about Metaphase I check below link:
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Which descriptions apply to Mendel’s pea plant experiments? Select three options.
A studied first generation plants only
B relied on random pollination and reproduction of plants
C used cross breeding to purposely breed plants
D studied a variety of pea plant traits
E focused primarily on breeding larger, healthier pea plants
F studied several generations of plants
The descriptions that apply to Mendel’s pea plant experiments include the following:
used cross breeding to purposely breed plants studied a variety of pea plant traitsstudied several generations of plantsOptions C, D and F are correct.
What are pea plants?The pea plant is regarded as the most commonly the small spherical seed or the seed-pod of the flowering plant species Pisum sativum.
During his experiment on the pea plants, Mendel opened the petals and removed the anthers from the flower and dusted the pistil with pollen from the plant he wished to cross it with and covered the flower with a small bag to prevent the pollen in the air from landing in the pistil. This process employed by mendel is called cross pollination.
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what is the definition of the word symbiosis
Answer:
interaction between two different organisms living in close physical association, typically to the advantage of both.
Explanation:
hope this helps
Symbiosis means the interaction between two different organisms.
in aphasia, the ability to speak or read is affected. a deficit in which of the following cortical areas would not lead to aphasia?
The following parts of the brain would not cause aphasia: prefrontal cortex.
n the case of a patient with Broca's aphasia, which lobe of the brain is affected?
Damage to the frontal lobe of the brain is what causes Broca's aphasia in sufferers. Because the frontal lobe has a role in motor movements as well, they frequently develop right-sided weakness or paralysis of the arm and leg.
Which of the following describes the symptoms of Broca's aphasia?Grammar errors or absences are signs of Broca's aphasia. a hard time making entire sentences. by leaving out specific words like "the," "an," "and," and "is" Instead of saying "I want the cup," a person with Broca's aphasia would say, "Cup, me."
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Which is the prominent c-shaped fiber tract that connects the right and left cerebral hemispheres?.
The noticeable c-shaped fibre tract known as the corpus callosum joins the left and right brain hemispheres. The main and greatest commissural tract that joins the right and left cerebral hemispheres is called the corpus callosum.
The principal commissural portion of the brain, the corpus callosum, is made up of white matter fibres that link the left and right cerebral hemispheres.The corpus callosum, a substantial bundle of nerve fibres that connects the two halves of your brain, enables communication and signal transmission between the two halves.Moving deliberately to the left The symptoms of corpus callosum syndrome include dyslexia, dysgraphia, dyspraxia, alien hand syndrome, decreased left visual recognition, and left auditory hearing loss.
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Developmental psychologists use measures at different levels of analysis. When researchers look at how gene expression is changed in children that live in stressful environments, they are using which level of analysis?.
Measures at the molecular level of analysis.
What types of inquiries pique the curiosity of developmental psychologists?What types of inquiries pique the interest of developmental psychologists? What alters the body, mind, emotions, and social aspects of people as they age? What does the phrase "cells to society" mean? What types of studies are conducted at each level?
What three topics do developmental psychologists mostly concentrate on?The goal of developmental psychology is to explain how thoughts, emotions, and behaviors change over the course of a lifetime. Physical development, cognitive development, and social and emotional development are the three main areas that are examined in this field.
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Suppose you discovered a mutation in sea urchins that caused them to produce eggs with an overly dense vitelline envelope. What would you expect to see if you combined these eggs with normal sperm?.
When an egg and a sperm fuse, they combine into a new cell called a zygote.
What do we get when sperm and egg combine?When an egg and a sperm fuse, they combine into a new cell called a zygote. The zygote contains all the genetic information it needs to become a new individual. This new cell then divides over and over, eventually forming a complete organism with the same genes in each cell.
Is a zygote a fertilized egg?The fertilized egg (zygote) divides repeatedly as it moves down the fallopian tube to the uterus. First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst.
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To amplify and express a gene of interest, it is first cut from the chromosomal dna and inserted into what?.
DNA sequences can be amplified after cutting chromosomal DNA with a restriction nuclease and inserting the resulting DNA fragments into the chromosome of a self-replicating genetic element.
A chromosome is an extended DNA molecule that homes all or a number of the genetic code of an organism. most chromosomes have packing proteins protecting their extraordinarily long, thin DNA fibres; in eukaryotic cells, the histones are the maximum important of these proteins.
To keep the integrity of the DNA molecule, these proteins condense and cling to it with the help of chaperone proteins. those chromosomes showcase a complicated 3-dimensional shape that is vital for controlling transcription.
below a mild microscope, chromosomes are usually most effective discernible at some point of the metaphase of cellular division.
Sister chromatids are the brand new name for the linked copies. A metaphase chromosome is an X-fashioned structure that forms at some stage in metaphase and is surprisingly compressed, making it the perfect to apprehend and look at.
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for 40 pionts!!!
23. Which of these is a feature of most shield volcanoes?
*
1 point
violent eruptions
steep sides
broad base
thick lava
24. Correctly identify these terms for where an Earthquake occurs. [A,B,C]
A.Fault, B.Epicenter, C.Focus
A.Fault, B.Focus, C.Epicenter
A.Focus, B.Epicenter, C.Fault
A.Focus, B.Fault, C.Epicenter
25. Which waves arrive 2nd at the Epicenter, move the slowest and do the most damage?
*
1 point
P waves
S- waves
26. Identify plate boundaries locations where earthquakes may occur....
*
1 point
Convergent Plate Boundaries
Divergent Plate Boundaries
Transform Plate Boundaries
Earthquakes can occur at all boundary types
27. What is the importance of Seafloor Spreading to the Theory of Plate Tectonics?
*
1 point
Where new crust is created as plates move and pull apart
Where many fossils have been found on the sea floor
Where coal deposits have been found connect to other plates
Where glacial deposits indicate it was once frozen
28. The volcanoes (red dots) in this map are MOST LIKELY caused by
*
1 point
Captionless Image
folding.
subduction.
metamorphism.
seafloor spreading.
Answer:
23. broad Base
24. A
25. S-waves are slower than P-waves.
26. Divergent Plate boundaries
*You do realize that your violating community guidelines by asking 6 different questions on one Question.
Your Welcome
Sea anemones are ocean animals that can reproduce both sexually and asexually. A single sea anemone is located in a stable, isolated environment that is capable of supporting a colony of sea anemones. Which type of reproduction would be the most beneficial for this sea anemone (complete gap 1 and gap 2)?.
Asexual reproduction is what would be most beneficial for this sea anemone. This is because the sea anemone is living in a stable habitat that can is good and can support a sea anemone colony.
What is asexual reproduction?
In asexual reproduction, offspring is produced by a single parent. The offspring produced are identical to each other physically and genetically. The offspring, therefore, are clones of the parent.
Both multicellular and unicellular organisms can reproduce asexually. There is no fusion of gametes or change in the chromosome number either. The offspring inherits all the genes same as the parent.
In asexual reproduction, the organisms reproduce and multiply rapidly, and it occurs over a short period of time.
Therefore, it would be most beneficial for the sea anemones to reproduce asexually.
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g how can the spread of disease-causing microorganisms be prevented through regular hand washing and cleaning of shared surfaces?
Regular hand washing and surface cleaning can stop the spread of pathogenic microorganisms. Handwashing with soap also gets rid of germs from hands.
What steps can you take to stop the spread of microorganisms?Before touching your eyes, nose, or mouth or before you eat, wash your hands. When someone is coughing or sneezing, wash your hands immediately. Shareware items including as towels, cosmetics, toys, and other items that could be contaminated with respiratory infections should never be used.
How can you prevent the spread of disease by washing your hands?In order to prevent the spread of germs that might cause illnesses like food poisoning, the flu, or diarrhea, washing your hands correctly removes dirt, viruses, and bacteria. It may assist in preventing the spread of illnesses to others.
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The cranial meninges are ______ layers that separate and support the soft tissue of the brain from the bones of the cranium.
The cranial meninges are three connective tissue layers that separate and support the soft tissue of the brain from the bones of the cranium.
What is connective tissue?Connective tissue is one of the major four tissues in the body which functions to provide structural support to body parts and also may serve to separate different tissues and structures such as in this case the cranial meninges in the brain.
Therefore, with this data, we can see that connective tissue is a fundamental tissue that may act to separate other tissues in the body.
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how is an hfr chromosome formed? how is an hfr chromosome formed? by a specific deletion mutation in the bacterial chromosome by a specific gene duplication in the f-plasmid by integration of the f-plasmid into the bacterial chromosome by a point mutation in a bacterial gene that is essential for conjugation request answer
An IS element on the F-plasmid and the identical IS element on the host chromosome can recombine to create Hfrs. Many bacterial chromosomes include multiple IS insertions. Consider the wild-type E.
Because they frequently transfer chromosomal genes, bacteria with an F-plasmid incorporated into the chromosome are referred to as Hfr strains.
A bacterium having a conjugative plasmid (such as the F-factor) incorporated into its chromosomal DNA is known as a high-frequency recombination cell (Hfr cell), sometimes known as a Hfr strain. The incorporation of the plasmid into the cell's chromosome is by homologous recombination. F plasmids, not the complete chromosome, are often transferred to the recipient bacterium during bacterial conjugation. Those bacteria are referred to as F+ strains or donors if they carry the F plasmid. They can create sex pili and transfer plasmids to other bacteria that take them in.
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the following statements concerning petroleum are all true except: a. some of the commercial uses of petroleum fractions include gasoline and kerosene. b. it is a thick, dark liquid composed mostly of hydrocarbons. c. all of its hydrocarbon chains contain the same number of carbon atoms. d. it was probably formed from the remains of ancient marine organisms. e. it must be separated into fractions (by boiling) in order to be used efficiently.
The following statements regarding petroleum are all actual besides option c. all of its hydrocarbon chains incorporate the same quantity of carbon atoms.
Option call of its hydrocarbon chains incorporates the identical variety of carbon atoms.
A hydrocarbon chain is a natural molecule along with nothing else however carbon and hydrogen atoms are arranged in a chain. The carbon atoms are interconnected to each different by way of covalent bonding.
Hydrocarbons are compounds that include the handiest carbon and hydrogen. Hydrocarbons are the best form of carbon-based total compounds, however, they can vary substantially in length. The smallest hydrocarbons have just one or two carbon atoms. the largest hydrocarbons may also have heaps of carbon atoms.
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Why is it more difficult to treat fungal infections than bacterial infections in humans?.
Fungal infections are more difficult to treat than bacterial infections because they are often resistant to drugs. Fungal infections can also be difficult to diagnose because they can mimic other types of infections.
First, fungal cells are more resistant to the effects of antifungal drugs than bacterial cells. This is because the cell walls of fungi are more resistant to the penetration of these drugs.
Second, fungi can develop resistance to antifungal drugs more easily than bacteria. This is because fungi can mutate more quickly than bacteria.
Finally, the immune system is not as effective at clearing fungal infections as it is at clearing bacterial infections. This is because fungi are more adept at evading the immune system than bacteria.
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Which animal does most of the heavy labor?.
Answer:
Boxer I guess
Explanation:
I looked it up and believe it or not, it was a boxer.
Well there's your answer. Please give Brainliest
