Typhoid fever is caused by bacteria in contaminated food or drink. In 1903, an outbreak of typhoid fever in Ithaca, New York, killed almost 80 people. In addition, more than 1,000 Ithaca residents became sick with the disease. The population shares the public water source. Which type of limiting factor was involved in the typhoid outbreak that occurred in Ithaca?density-independent factor

density-dependent factor

population-dependent factor

population-independent factor

Answers

Answer 1
Answer:

Answer : Option B) Density -  dependent factor.

Explanation : Typhoid outbreak is dependent of the density as the people of the region are getting the water from the same source so, the density of the area is also an influencing factor in spreading the disease. The bacteria is also getting transmitted from one human to other human too.

Answer 2
Answer:

The type of limiting factor that was involved in the outbreak of typhoid fever that occurred in Ithaca was the density-dependent factor.

What is typhoid fever?

Typhoid fever is an acute bacterial disease caused by Salmonella enterica serotype Typhi, with worldwide distribution. The disease is directly associated with low socioeconomic levels, especially in regions with poor basic sanitation, personal and environmental hygiene.

With this information, we can conclude that the outbreak of typhoid fever depends on density, as people in the region are receiving water from the same source, therefore, the density of the area is also a factor that influences the spread of the disease.

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Human Genome researchers discovered transposons. What are these structures?

Answers

Answer:

Transposon is a fragment or sequence of DNA that can move unregulated to any point in the cell genome, leading to a phenomenon called transposition.

Explanation:

Transposon is the name of what was previously known as jumping genes, being a DNA sequence capable of moving freely within a DNA molecule. A transposon can produce mutations by translocation, altering the total amount of nucleotide in DNA molecule.

Genetic changes that are linked to evolutionary processes can be due to the existence of transposons, since they can even induce chromosomal changes.

According to “Making History with Vitamin C,” how did Cook persuade his men to want sauerkraut?A. He made it available only to the officers at first.
B. He flogged them if they refused to eat it.
C. He tried new recipes every week until he found one they liked.
D. He showed them what a man very sick with scurvy looked like

Answers

Cook persuade his men to want sauerkraut by :
B. He flogged them if they refused to eat it.

When Cook realized that the men refused to eat the sauerkraut, he took it away from them and said that only the officers could eat it and he allowed to put it on officer's table only.

Answer:

It's B

Explanation:

I got right

To properly record a measurements, you must record which of the following? (pick as many as you want) A. Number
B. Hypothesis
C. Summary
D. Unit

Answers

TO properly record a measurement, it is a must to record the unit of measure of a certain object that you wanted to measure.
When you say unit it means, that the length, width and height. It may also be the radius, diameter or circumference.

Which of the following would be considered a source of error in an experiment?A. Laboratory mice are similar but not identical to each other.
B. A student makes a mistake when measuring volume.
C. The hypothesis was unrelated to the research question.
D. Temperature readings are made late in the day, when everyone is tired and eager to go home.

Answers

D. Temperature readings are made late in the day, when everyone is tired and eager to go home.

Errors are what makes your measurement invalid and unreliable. There are two types of error which is called the systematic error and the random error. Each error has different sources. Words that were mentioned –invalid and unreliable are very important key aspects to determine that your measure is truly accurate and consistent. Some would recommend using the mean method, doing three trials in measuring and getting their mean, in response to this problem.

Following a severe automobile accident, a client is scheduled to have surgery to either repair or remove his spleen, pancreas, and stomach. The client wants the organs repaired and not removed if at all possible. However, the nursing staff understands that extensive regeneration in parenchymal organs can only occur if:

Answers

Answer:

The correct answer is: the extensive regeneration in parenchymal organs can only occur if the residual tissue is structurally and functionally intact.

Explanation:

The only parenchymal organ that can have proper regeneration is the liver. In other organs, regeneration is limited and can only happen with stable cell populations. For these organs to regenerate, the residual tissue MUST BE structurally and functionally intact; if it isn't, it will be replaced with scar tissue.

Upon vigorous exercise, your heart rate increases to 200 beats per minute to supply sufficient oxygen to muscles. Which is responsible for this regulation of the heart rate? A. Semilunar valvesB. Sinoatrial node
C. Aorta

Answers

I think the correct answer from the choices listed above is option B. The one that is responsible for the regulation of the heart rate is the sinoatrial node. It is the heart's peacemaker. It is a specialized bundle of neurons which controls the cardiac function. Hope this answers the question.

Answer:

The correct answer would be option B.

Sinoatrial node is also known as heart's pacemaker as it controls the heart rate.

It consists of cluster of cells in upper region of the right atrium. These cells generate electrical signals which are passed onto atrioventricular node.

It is the cluster of cells which is located at the centre of the heart.

It passes and slows down the electric signals to the ventricles.