Answer: Firstly it should be noted that, the chances of hybridization between two ground finch species should be less than the chances of hybridization between two tree finch species. On this wise, their genomes would be more similar to each other than are the genomes of the five tree finch species. Secondly, they should be limited to the six islands that most recently emerged from the sea.
Thirdly, they should share fewer anatomical homologies with each other than they have shared with the tree finches.
Fourtly, their genomes should be more similar to each other than are the genomes of the five tree finch species.
A measure of the total amount of life
that is able to grow and exist in a
particular area is called
A. the climate.
B. species richness.
C. the altitude.
D. productivity.
Answer:
A the climate I know it is the answer
Type your response in the box. Many countries have laws that regulate hunting, including restricting hunting to specific times of year. Why is this hunting restriction important for preserving certain animal populations?
Answer:
You can only hunt dear (example) for only sertin times of the year because when the doe's have their fans people want them to get big before they shoot them
Answer:
Animal populations can change from one season to another, so it’s important to restrict hunting to seasons when the population is high. Such a restriction helps prevent a severe drop in population, which could threaten the species. It’s also important to limit hunting during breeding seasons to increase the possibility of offspring reaching adulthood.
Explanation:
Plato.
If the number of cigarettes smoked increases, then the risk for lung cancer increases. Independent variable: _______ Dependent variable: _______ If the number of sharks swimming in a coastal region increases, then the number of shark attacks on humans will also increase. Independent variable: _______ Dependent variable: _______ If the amount of milk a person drinks increases, the strength of his or her bones will stay the same. Independent variable: _______ Dependent variable: _______
Complete Question:
Part A: Identifying Variables
Read the following hypotheses and identify the variables.
If the number of cigarettes smoked increases, then the risk for lung cancer increases.
Independent variable: _______
Dependent variable: _______
If the number of sharks swimming in a coastal region increases, then the number of shark attacks on humans will also increase.
Independent variable: _______
Dependent variable: _______
If the amount of milk a person drinks increases, the strength of his or her bones will stay the same.
Independent variable: _______
Dependent variable: _______
Answer/Explanation:
Dependent variables are variables that is dependent on the independent variables. That is, it is the variable that changes as the independent variable changes.
Depedent variable is the main interest if a researcher. It is the variable that is measured in a research work.
In the above given hypotheses, the dependent and independent variables are shown below:
1. "risk for lung cancer" is dependent on the "number of cigarettes smoked".
"Risk for lung cancer" => dependent variable
Number of cigarettes => independent variable
2. "number of shark attacks on humans" is dependent on "number of sharks swimming".
Dependent variable => number of shark attacks on humans
Independent variable => number of sharks swimming
3. Dependent variable => strength of bone
Independent variable => amount of milk a person drinks
Answer:
Lab: Heart Rate
Part A: Identifying Variables
The dependent variable happens as a result of values/changes associated with the independent variable.
Independent variable: number of cigarettes smoked
Dependent variable: risk for lung cancer
Independent variable: number of sharks swimming in a coastal region
Dependent variable: number of shark attacks on humans
Independent variable: amount of milk a person drinks
Dependent variable: the strength of his or her bones
Part B: Heart Rate
Hypothesis: If I hold my breath for 30 seconds, then my heart rate will
(choose 1) increase/decrease.
Independent variable: holding my breath
Dependent variable: heart rate
Part C:
The heart rate decreases because oxygen exchange in the lungs decreases.
This depends on what you chose for heart rate in the hypothesis. If you said the heart rate decreases after holding your breath, and the results showed the heart rate decreased, then the hypothesis is supported. If you said the heart rate decreases after holding your breath, and the results showed the heart rate increased, then you refuted the hypothesis.
Heart rate can change due to an increase or decrease in activity, moving positions such as sitting and standing, and emotions.
Example: Increase in activity—jumping jacks
Hypothesis: If I do five jumping jacks, then my heart rate will increase.
Test hypothesis. You can use the average resting heart rate from the previous experiment. If you do an experiment with an increase in physical activity like jumping jacks, then your data will reflect an increase in heart rate because the body requires more energy, which requires more oxygen, increasing the overall flow of blood in the body.
Support or refute the hypothesis based on the results. The hypothesis is supported if it aligns with the observed results. The hypothesis is refuted if the results don’t match the statement based on the variables.
Testing more than one variable at a time makes it difficult to interpret the results and support or refute the hypothesis. With one variable, the results can be associated with changes to that variable. To get the most reliable data to support or refute a hypothesis, an experiment should be completed several times to see if the results show the same trends.
Explanation:
Penn Foster
Which of the following group behaviors is primarily offensive, rather than defensive?
Answer:
Abusive behaviour, Discrimination or harassment are offensive.
Explanation:
Abusive behaviour, Discrimination or harassment are the behaviour which is offensive not defensive because in these behaviour people show aggression towards other people which is offensive in nature. These behaviour should be avoided because these behaviours hurt people and disturbance occurs in the society. These types of behaviour shows true color of the individual and the family he belong.
A week after a near-drowning incident, a 6-year-old boy presents with respiratory distress, tachypnea, and fever. What should you suspect
Answer: I would suspect there was actually something in the water that caused this. Maybe the child swallowed some of the water.
Explanation:
Shown above
At temperatures higher than the maximum growth temperature for an organism:
a. proteins are permanently denatured. membranes become too fluid for proper function.
b. hydrogen bonds within molecules are broken.
c. hydrogen bonds are broken and proteins are permanently denatured.
d. hydrogen bonds are broken, proteins are denatured, and membranes become too fluid.
Answer:
The correct answer is option d, that is, hydrogen bonds are broken, proteins are denatured, and membranes become too fluid.
Explanation:
The maximum growth temperature refers to the highest temperature at which growth can take place. Let us take an example of bacteria, it is found that each bacterial species possess a requirement of specific growth temperature, which is mainly determined by the requirement of the temperature of its enzymes. Each of the organism exhibits an optimum growth temperature, a minimum growth temperature, and a maximum growth temperature.
When for an organism, the temperature goes more than its maximum growth than it results in the dissociation of the hydrogen bonds, denaturation of the proteins, and even the membranes become too fluid. This can even result in the death of the species. However, there are some of the organisms, which can thrive high temperatures known as thermoduric organisms, but they fail to grow effectively at such temperatures.
During which of the following processes is carbon released into the atmosphere as carbon dioxide?
OA. photosynthesis and combustion
respiration and photosynthesis
OC. respiration and combustion
OD. combustion and sedimentation
22 of 30 Answered
Session Timer: 3:55
Answer:
Respiration and Combustion
Explanation:
An organism is _______ for a gene if it has two copies of the same allele for the gene.
The genotype of an organism and the interaction of the genotype with the environment determine the organism’s _______, or observable characteristics.
The law of independent assortment states that the separation of alleles for one gene are independent of that of other genes, unless the genes are _______.
Mendel’s law of _______ governs which allele is expressed in an individual.
Respond to the following based on your reading.
In the previous section, you learned that the allele for brown eyes (B) is dominant, and blue (b) and green eyes (g) are recessive, while green eyes are dominant over blue eyes. What eye color would someone with the following genotypes exhibit? (a) BB, (b) Bb, (c) gb, (d) Bg, (e) bb.
Discuss the law of segregation and explain why each organism has two copies of the gene for each trait expressed.
What type of experiments did Mendel conduct, and what did he want to find out about the heritability of the seven traits he chose to study?
Answer:
1. Purebred (N.B: the exact word is considered a foul word)
2. Phenotype
3. Linked
4. Segregation
5) (a) BB- Brown eyes
(b) Bb- brown eyes
(c) gb- green eyes
(d) Bg- brown eyes
(e) bb- blue eyes
The other questions are explained below
Explanation:
1. A purebred organism is that which possess two copies of the same alleles in its genotype. An allele is a contrasting form of a gene. If the two alleles are the same, the organism is said to be purebred.
2. Phenotype of an organism is the observable characteristics of the organism. It is determined by the organism's genotype in interaction with its environment.
3. Mendel's law of independent assortment states that the alleles of a gene will separate into gametes independently of another gene unless the genes are linked. Linked genes are genes that are too close to each other on a chromosome and hence, do not sort independently. They're rather inherited together.
4. Mendel’s law of Segregation governs which allele is expressed in an individual. According to this law, an organism will express the allele it randomly receives from each parent. If an organism receives two different alleles, it will express the allele that is dominant. In other words, an organism will only express the recessive trait if it receives two recessive alleles from both parents.
5. a) BB- Brown eyes because the organism is purebred for the dominant (brown) allele
(b) Bb- brown eyes because the brown allele (B) will mask the expression of blue allele (b) and express itself.
(c) gb- green eyes because the allele for green eyes (g) is dominant over the allele for blue eyes.
(d) Bg- brown eyes because the brown allele (B) is dominant over the allele for green eyes (g), hence, it will mask its expression
(e) bb- blue eyes because the organism is purebred for the blue allele i.e. same recessive (blue) alleles in the gene.
6. The law of segregation as proposed by Mendel states that the alleles of a gene will separate into gametes during gamete formation (meiosis). This is done in such a way that each gamete contains only one allele of each gene. Hence, an organisms will contain two copies of a gene because they receive each copy (allele) from each parent during fusion of their gametes.
7. Mendel conducted an hybridization experiment i.e. a cross involving two individuals that possess different traits. He did this in order to find out how different traits/characteristics in organisms were transferred from one generation to another. Mendel chose the pea plant for his experiment because they could easily be manipulated for self and cross pollination. Mendel studied seven (7) different traits or characteristics in pea plants including height, seed shape, seed color, flower color etc.
In an ________ solution, red blood cells ________. Group of answer choices hyposmotic, lose water and shrivel isomotic, have a normal shape isosmotic, swell and may burst hyperosmotic, have a normal shape isosmotic, lose water and shrivel
[tex] \large{ \boxed{ \bf{ \color{skyblue}{The \: correct \: question:}}}}[/tex]
Q. In an ________ solution, red blood cells ________. Group of answer choices:
Hyposmotic, lose water and shrivel Isomotic, have a normal shape ✔️Isosmotic, swell and may burst Hyperosmotic, have a normal shape Isosmotic, lose water and shrivel[tex] \large{ \boxed{ \bf{ \color{violet}{The \: correct \: answer:}}}}[/tex]
In an isosmotic solution, red blood cells have normal shape.
Option B
Explanation:-Osmosis : The movement of the solvent or water molecules from a solution of their higher concentration to a solution of lower concentration through a semipermeable membrane.
❍ Depending upon the osmotic concentration, There are three types of solution and their result when cell is keot inside them:
Hyposmotic (Water enters, Swells up)Isosmotic(Equal flow, No change)Hyperosmotic(Water comes out, shrinkage)━━━━━━━━━━━━━━━━━━━━
write five example of bodies which are at rest
Answer:
1. A person sitting on a chair.
2. Water in a bucket.
3. Bus without a driver.
4. Electric fan without electricity.
5.Car without engine.
A scientist thinks that a certain chemical is a mutagen. She exposes plant cells to a large amount of this chemical in the laboratory. Which statement best provides evidence that the substance is a mutagen? -The cells die within hours of being exposed to the chemical. -The cells grow more quickly than those that were not exposed to the chemical. -The cells change after being exposed to the chemical, and this change is passed to the next generation of cells. -The cells continue to divide at the same rate as before they were exposed to the chemical.
Answer:
The cells change after being exposed to the chemical, and this change is passed to the next generation of cells.
Explanation:
Mutation is a process that occurs from time to time to the genetic material of living cells. Mutation is a change in the nucleotide sequence of a DNA or gene. It is usually caused by errors during replication or induced by an external substance called MUTAGEN.
A mutagen is any substance that causes mutation in an organism. Hence, according to the question, the chemical substance which is thought to be a mutagen will change the cells after being exposed to the chemical, and this change is passed to the next generation of cells.
N.B: Since mutation affects the gene, it is passed on to the offsprings during reproduction.
Answer:
its c did the test
Explanation:
if you think about fat as old stuff,what new stuff can be made from it
Answer:
Paints, Lubricants, Biofuel, Face cream, Soap,
Explanation:
Fat is derived from plant and animal sources. They include seeds, fruits, fatty fish.
Fats serve as a source of energy in organisms and also serve as insulation.
If you think about fat as old stuff,what new stuff can be made from it means of the things fats can be made from and they include Paints, Lubricants, Biofuel, Face cream, Soap etc. These products are manufactured in industries on a large scale due to their high demand.
Answer:
Paints, Lubricants, Biofuel, Face cream, Soap,
Explanation:
Do you think cystic fibrosis or muscular dystrophy, genetic disorder, would show up in a person's DNA fingerprint profile? Explain your Reason Please.
Answer:
we can find such type of genetic disorders through pedigree chart.
Explanation:
cystic fibrosis is a Autosomal recessive disease
Muscular dystrophy is a Autosomal dominant disease.we can see them by observing the next generations going on .we can't find them in person's DNA fingerprint profile.
According to Piaget, children have acquired the cognitive skill of conservation when they're able to
Answer:
The question lacks options, the options are:
A. understand the viewpoint of other people.
B. realize that the term heavy describes an object one way and the term big describes it another way
C. understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal.
The answer is C
Explanation:
Piaget proposed the theory of cognitive development, which talks about how human intelligence is developed. Piaget worked with Children because he believed they played a significant role in the development of cognitive intelligence. Based on his work, he proposed four stages of cognitive development viz: sensorimotor, preoperational, concrete operational and formal operational stages.
However, in the preoperational stage, Piaget described children between ages 2-7 as being in this stage of cognitive development where they are yet to comprehend mental logic. One characteristics of this stage is CONSERVATION, which is the ability to know that changing a substance's appearance doesn't change the properties of that substance. Piaget proposed that Children between the ages of 2-7 lacked this conservative characteristics.
He performed an experiment where he used two beakers with the same amount of liquid. He then emptied the contents of one of the previous beakers into a new beaker with different shape (longer). Piaget was able to notice that Children at the pre-operational stage were unable to understand that the contents of the two beakers (longer one and previous beaker) were still the same despite the beaker has been changed.
Hence, according to Piaget, a child has acquired the cognitive skill of conservation when he/she is able to understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal.
"When human settlers arrived on the island of Mauritus, they caused the Dodo bird species to become extinct within 50 years. What did the settlers do to cause their extinction?"
Answer:
It's commonly believed that the dodo went extinct because Dutch sailors ate the beast to extinction after finding that the bird was incredibly easy to catch due to the fact it had no fear of humans.
Explanation:
Ergogenic aids can be useful in some circumstances, some are possibly useful but still under study, and still others are downright dangerous and illegal. 1. human growth hormone.
2. anabolic steroids
3. creatine
4. caffeine
5. beta-hydroxy-beta methylbutyric acid (HMB)
6. branched-chain amino acidsA. The use of_____may improve performance for those who undertake repeated bursts of activity, such as in sprinting or weightlifting.B. Consuming small amounts of_______can increase menta alertness. C. Consuming______may enhance muscle recovery after intense physical activity. D. An ergogenic aid that increases muscle mass but may also cause uncontrolled growth of the heart or other organs and is banned by the International Olympic Committee is______.
Answer:
Using beta-hydroxy-beta methylbutyric acid (HMB) can improve performance for those who perform explosive repetitions of activity, such as running or lifting weights. Consuming small amounts of caffeine can increase mint alertness. C. The consumption of branched-chain amino acids and creatine can improve muscle recovery after intense physical activity. D. An ergogenic aid that increases muscle mass but can also cause uncontrolled growth of the heart or other organs and is prohibited by the International Olympic Committee: anabolic steroids.
Explanation:
In the answer I leave you the text with the blanks completed ... It is also important that you know that amino acids are important for the formation of muscle mass and its recovery, in addition to creatinine.
On the other hand, these supplements are administered in people who have high performance in sports, and accompanied by a good diet and specific diet, otherwise they will not work.
Anabolics are chemical structures that promote energy reserves and anabolism for muscle tissue hypertrophy, but they do not have a selective effect on the skeletal muscle, but rather affect other parts of the body, that is why they are risky, cause heart failure, cardiovascular, liver, kidney, and even possible alterations of the gallbladder.
What factor about cellular respiration are you testing? ( what makes the three bottles different?)
Answer:
Gas.
Explanation:
Gas which is present makes the three bottles different from one another. There are three factors which is used for testing of cellular respiration such as amount of oxygen consumed during this process, amount of glucose used and amount of carbondioxide produced during cellular respiration. During cellular respiration, oxygen used in order to break down glucose and releases high amount of energy with the waste materials such as carbondioxide gas.
Bile juice dose not contain any digestive enzymes yet it is essential for digestion why so ?explain
Explanation:
Although bile juice does not contain any enzymes, it contains bilirubin and biliverdin. These help to break big fat globules into small globules which is taken to pancreatic juices to be further digested. This is known as emulsification of fat. It also helps in secretion of lipase. Thus it plays an important role because majority of the fat digestion process is carried out by it.
Don't forget to mark the answer as brainliest if it is truly the best! Thank you!
TLRs are Group of answer choices the coatings of pathogens by complement. present in intact skin, sebum, tears, etc. phagocyte receptors that detect PAMPs. nonspecific leukocytes that secrete toxins onto the surface of virally infected cells. molecules that damage cells, resulting in cell lysis.
Answer: Phagocyte receptors that detect PAMPs
Explanation:
TLRs or Toll-like receptors, are a family of proteins that are part of the innate immune system. TLRs are transmembranous and recognize pathogen-associated molecular patterns (PAMPs), which are groups of chemical characteristics common to certain types of pathogens. Patterns detected by TLRs include lipopolysaccharide, a compound found on the surfaces of Gram-negative bacteria, and double-stranded RNA, which is an integral part of the life cycles of many viruses. These PAMPs are generally important for the survival of the pathogen, so they are well preserved. Activation of these receptors induces inflammatory responses in leukocytes of myeloid lineage, signaling via NF-κB, which is a transcription factor that activates pro-inflammatory genes. Activated TLRs also increase the production of co-stimulatory molecules such as CD80, CD86 and CD40. These proteins, expressed on the surface of antigen-presenting cells, are necessary for the activation of T-lymphocytes by dentritic cells and macrophages already showing antigens in their MHC type II molecules (Major Histocompatibility Complex, they participate in the presentation of antigens to T lymphocytes)
In addition, TLR-mediated signaling on antigen-presenting cells (APCs) plays an important role in linking the innate and adaptive immune responses.
i don’t know how to answer this question
The answers are:
fungi = basidiomycota
animalia = insect
plantae = cactus
What are fungi?A fungus is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms.
Many people mistakenly believe fungi are plants. However, fungi are neither plants nor animals but rather organisms that form their own kingdom of life. The way they feed themselves is different from other organisms: they do not photosynthesize like plants and neither do they ingest their food like animals.
Learn more about fungus here: https://brainly.com/question/22479850
#SPJ2
During which stage of cellular respiration is glucose broken down into two molecules of pyruvic acid?
Answer: Glycolsis
Glycolysis happens in the cytoplasm of the cell. Afterwards, in the presence of Oxygen, the two molecules will undergo pyruvate oxidation in the mitochondrial matrix.
Over the period of a few days, a hospital receives an overwhelming increase in the number of patients with food poisoning. How would a scientist respond to this increase in sick patients? A. by examining the type and source of foods each patient ate and identifying patterns of overlap within the foods consumed B. by giving the patients vitamin injections and prescribing a medication to calm their stomach and bowel symptoms C. by recording the patients' symptoms in their medical records and advising them to get rest and drink fluids D.by providing kind words, nurturing, and emotional support to the patients and asking them about their feelings
Answer:
A. By examining the type and source of foods each patient ate and identifying patterns of overlap within the foods consume.
Explanation:
I believe a medical professional would be the one to prescribe patients with any sort of medicine they needed, whereas the scientist would be investigated what caused the food poison and running tests to help find out what happened.
Answer:
A. By examining the type and source of foods each patient ate and identifying patterns of overlap within the foods consume.
Explanation:
Lisa is working on a science project. Her task is to
answer the question: "Does fluoride (which is a
commercial hair product) prevent cavities?". Her
family is willing to volunteer for the experiment.
11. Describe how Lisa would perform this experiment. Identify the control group, and the independent variables in your description
Answer:
The fluoride is what helps you avoid cavities
Explanation:
water fluoridation as safe and effective in preventing tooth decay for both children and adults
Which receptor, when activated, most likely prompts the production of saliva?
A. auditory receptors
B. optic receptors
C. skin receptors
D. taste receptors
Answer:
[tex]\large \boxed{\sf D. \ taste \ receptors}[/tex]
Explanation:
When activated, the receptor most likely prompting the production of saliva is the taste receptor. When food enters the mouth, the salivary glands produce the saliva upon the sensation of taste.
Answer:
Taste receptors.
Explanation:
When activated, the receptor most likely prompting the production of saliva is the taste receptor. When food enters the mouth, the salivary glands produce the saliva upon the sensation of taste. The secretion of saliva (salivation) is mediated by parasympathetic stimulation; acetylcholine is the active neurotransmitter and binds to muscarinic receptors in the glands, leading to increased salivation.
The century cactus flowers every 100 years. A similar and nearby cactus flowers every 50 years. If the 50-year-cactus pollen has the correct characteristics to fertilize the century cactus, which reproductive barrier will most likely be working against that possibility
Answer:
Temporal isolation
Explanation:
Temporal isolation, a type of reproductive barrier caused by variations in the timing of mating receptivity, activity, or fertility, prohibits interbreeding between different but closely related species.
What is the temporal barrier in reproductive isolation?In biology, temporal isolation is a form of reproductive isolation mechanism that prevents members of closely related species from mating and creating hybrid offspring.
Temporal isolation refers to the situation where two or more species reproduce at various periods. For instance, three different types of orchids live in the same rain forest.
This mechanism arises from differences in the timing of crucial reproductive events.
Therefore, Temporal isolation reproductive barrier will most likely be working against that possibility.
Learn more about reproductive isolation here:
https://brainly.com/question/3089401
#SPJ6
Which of the following is not an example of energy transformations in an ecosystem?
a. sunlight driving photosynthesis in plants
b. herbivores feeding on plants
C. predators feeding on herbivores
d. none of the above
Answer:
d. none of the above
Explanation:
Energy, which refers to the ability to do work, can exist in different forms. The process of changing energy from one form to another is called TRANSFORMATION OF ENERGY. In an ecosystem, all organisms require energy in order to perform their life processes. They acquire these energy in different forms and convert it to a usable form by their cells (chemical energy) in ATP.
For example, solar energy in Sunlight is used by plants to drive their photosynthetic process and change it to chemical energy in glucose. Also, predators and herbivores feeding on herbivores and plants respectively converts one form of energy to another. Hence, all options are examples of energy transformation. None of the above is the correct answer.
Answer:
I think the correct answer is d ,
because all of them are an example of energy transforming in an ecosystem.
Hope this helps you guys!!!!!!
:)Which of the following describes a positron emission tomography (PET) scanner? 1: A device that uses magnetic fields to produce images of brain structures 2: A device that uses magnetic fields to measure blood flow 3: A device that uses radioactive fluid to determine the active areas of the brain 4: An X-ray device that can create a 3D model of the brain
Answer:
3: A device that uses radioactive fluid to determine the active areas of the brain
Explanation:
A positron emission tomography (PET) scan is an imaging test that helps reveal how your tissues and organs are functioning. A PET scan uses a radioactive drug (tracer) to show this activity. This scan can sometimes detect disease before it shows up on other imaging tests.
Depending on the type of exam, the radiotracer is injected, swallowed or inhaled as a gas. It eventually accumulates in the area of the body under examination. A special camera or imaging device detects radioactive emissions from the radiotracer. The camera or device produces pictures and provides molecular information.
What structure(s) in the cardiovascular system connect arteries to veins?
valves
heart
capillaries
lymph
Answer:
C. Capillaries
Explanation:
form the connection between the vessels that carry blood away from the heart (arteries) and the vessels that return blood to the heart (veins).
In a cladogram (a type of phylogenetic tree), clades are groups of related organisms. In the past, phylogenetic lists built clades using the idea of parsimony, that the pattern that uses the fewest evolutionary changes is the most likely to be correct. Today, with the use of computers and DNA sequences, the explanation that is thought to be the best is ___________ .
Answer:
one with the fewest number of genetic differences in the nucleotide sequence.
Explanation:
A cladogram is a diagram capable of showing the relationships among different species and/or group of organisms. In a cladogram, the root indicates the common ancestor, while internal nodes represent the common ancestors of each group. In consequence, this diagram can be used to establish evolutionary relationships in which the start branch points represent common ancestors shared by the organisms found in the 'branches'. Nonetheless, the length of the branches in the cladogram does not represent evolutionary distances among groups. In recent years, cladograms based on DNA sequencing data have been combined with morphological data to establish evolutionary relationships among species.
In 1937, a man employed to lay water pipes was found to be the source of a severe epidemic of typhoid fever. The man, an asymptomatic carrier of Salmonella enterica serotype Typhi, the bacterium that causes typhoid, habitually urinated at his job site. In the process, he contaminated the town's water supply with bacteria from his bladder. Over 300 cases of typhoid fever developed, and 43 people died before the man was identified as the carrier.
How was this carrier identified?
a) nasal swab
b) sputum sample
c) throat swab
d) urine culture
