Many whole families died when the plague hit Europe. Since the bite of a flea was the main transmission of plague, how did it MOST likely spread to the rest of the family?

A.
Every person would have to be bitten by an infected flea.

B.
The plague was passed through contaminated water and sewage.

C.
If the family were in close contact with the sick person’s boils, they could get the bacteria.

D.
If the plague had spread to the lungs and a person coughed, it could spread to others.

Answers

Answer 1
d coughing has saliva and someone who was probably but by a flea( a is a solid choice but not the best) coughs carry saliva a good distance, infecting people and animals


choice D

Related Questions

Which best describes a recessive allele?

A. Always inherited from a parent when a dominant allele is inherited from the other parent.
B. Never inherited from a parent when a dominant allele is inherited from the other parent.
C. Only determines phenotype when a dominant allele for the same trait is present.
D. Does not determine phenotype when a dominant allele for the same trait is present.

Answers

Answer:

B!

Explanation:

A recessive allele can't be shown in the child unless there is no dominant allele.

Hope this helps, please mark me brainliest if it does! :)

Answer:option d

Explanation:

because ressesive alleles is not exhibited when a dominant allele is present. it may help to find genotype but not phenotype.

Which is the general equation for cellular respiration?
A. carbon dioxide + water + energy --> oxygen + glucose
B. glucose + energy --> carbon dioxide +oxygen + water
C. carbon dioxide + glucose --
--> water + oxygen + energy
D. glucose + oxygen --> water + energy + carbon dioxide

Answers

Answer:

D. glucose + oxygen ⇒ water + energy + carbon dioxide

Explanation:

The reactants of cellular respiration, or the substances that are used for the beginning of the chemical process, are sugar (glucose) and oxygen. The products, or the results of cellular respiration, are water, carbon dioxide, and ATP energy. Thus, D is the answer.

The general equation for cellular respiration is glucose + oxygen --> water + energy + carbon dioxide, which is in option D. So, here, the correct answer is option D.

Glucose is a sugar molecule that serves as the primary source of energy for cells. It is derived from the breakdown of carbohydrates in the diet or can be produced through other metabolic processes. Oxygen is required for cellular respiration as the final electron acceptor in the electron transport chain. It is obtained from the air through breathing or from other sources in organisms that do not respire aerobically. During cellular respiration, glucose and oxygen undergo a series of metabolic reactions in different stages, including glycolysis, the citric acid cycle, and oxidative phosphorylation. The correct option is option D.

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A control group is a group that:

Answers

Answer:

It is a group designed to not be affected by any variables and to be used as a comparison to the other groups. It helps increase the reliability of your results, as it shows your independent variable is what made something happen in your experiment.

distinguish between l-form bacteria and bacteria

Answers

Answer:

your answer Miss. or Mr.

Label flower parts pls

Answers

Answer:

1Anther

2Filament

3Stamen

4Stigma

5Style

6Ovary

7Pistil or gynoecium

8Ovule

9Petal

10Sepal

Explanation:

Answer:

AntherFilamentStamenStigmaStyleOvaryPistilOvula/OvumPetalSepal

Inorganic, crystalline substances found naturally within earth are known as

Answers

Answer:

Minerals.

Explanation:

Minerals can be defined as any form of naturally occurring, inorganic solid substance characterized by a crystal structure. Also, minerals are homogeneous in nature with a defined chemical composition and characterized by a crystal structure comprising of ions, atoms, or molecules in an orderly arrangement.

Generally, molecules attach on the inside of a mineral to give it shape. Therefore, the molecule of a mineral is a crystal three-dimensional regular structure (arrangement) of chemical particles that are bonded together and determines its shape.

Due to the fact that these molecules are structurally arranged or ordered and are repeated by different symmetrical and translational operations they determine the shape of minerals.

Hence, inorganic, crystalline substances found naturally within earth are known as minerals. Some examples of minerals are iron, copper, aluminum, tin, coal, quartz, feldspar, mica, etc.

You have isolated a new single gene mutation in zebrafish you call Casper because the mutant fish are clear (no pigments in the scales). You perform the following crosses: Cross Progeny Wild type X Casper 20 clear, 19 normal Casper X Casper 21 clear, 10 normal a. You notice that each cross produced a similar number of clear offspring but different number of normal offspring. What is going on here

Answers

Answer and Explanation:

Due to technical problems, you will find the complete answer and explanation in the attached files

Which method of genetic recombination is illustrated in the diagram?

Answers

Answer:

The correct answer is this one "independent assortment." Independent assortment refers to the formation of random combinations of chromosomes in meiosis and of genes on different pairs of homologous chromosomes.

Explanation:

I wish This would be helpfull for you

Decrease in blood pressure in directly causes widespread VASCONSTRICTION Resulting in a rise in blood pressure is this a negative or positive feedback ?

Answers

positive feedback , i’m pretty sure. why? well

The possibility of a baby having a certain genetic trait is in the ratio of 3.1. Give the probability of this occurring as a fraction and as a
percentage. Explain.
Tyn your answer below

Answers

Fraction-1/4
Percentage-25%
Because In a punnet square there are 4 squares and in a 3:1 ratio it would mean one of the squares is affected by the genetic trait so it would be 1/4. And 1/4 is 25%.

increasing intracellular cAMP leads to smooth muscle relaxation by: Group of answer choices inhibiting IP3 channels, leading to decreased Ca2 in the sarcoplasm and reduced contraction. Increasing the relative activity of MLCP, leading to a decrease in tension. Activating K channels, increasing K leaking out of the cell which hyperpolarizes it and decreases the likelihood of Ca2 entry. Lower levels of MLCK activity, leading to decreased contraction.

Answers

Answer:

1. Inhibiting IP3 channels, leading to decreased Ca2 in the sarcoplasm and reduced contraction.  

2. Increasing the relative activity of MLCP, leading to a decrease in tension.

3. Activating K channels, increasing K leaking out of the cell which hyperpolarizes it and decreases the likelihood of Ca2 entry.

Explanation

In smooth muscle, cyclic AMP (cAMP) mediates relaxation because cAMP inhibits a specific kinase required for myosin light chain protein (MLCP) phosphorylation, thereby triggering contraction in the smooth muscles. It has been shown that cAMP inhibits 1,4,5-trisphosphate (IP3)-dependent calcium ions (Ca 2+) release by activation of the cGMP-dependent protein kinase (PKG). PKG proteins act to modulate Ca2+ oscillations by stimulating sarcoplasmic Ca2+-ATPase membrane proteins, increasing Ca2+ in the sarcoplasmic reticulum stores and Ca2+ efflux from the cells, and activate voltage-gated potassium (K) channels, thereby leading to membrane hyperpolarization and reducing Ca2+ entry through Ca2+ channels.

Tillage can release pollutants in the soil and
increase erosion.
o decrease erosion
o promote soil compaction
O promote fertilizer retention

Answers

Answer:

Increase erosion because the soil is being loosened

Explanation:

Tillage can release pollutants in the soil and  - option. increase erosion which is applied to conventional tillage.

The preparation of the soil by mechanical agitation such as digging, plowing, overturning, and other ways, in agriculture for the purpose of plantation and cultivation of crops.

Disadvantageous of Tillage:

causes an eventual loss of soil production.accumulating pollutants in topsoil due to the movement of the components present in the soil.Increases in erosion rates due to loose soil.The destruction of earthworm pathways and root channels leads to a decrease in the quality of the soil.

Thus, the correct answer is - option. increase erosion

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Check Your Understanding
Question: What is an adaptation?

Answers

Answer:

an adaptation can be defined as an inherited trait which confers an evolutionary advantage to the organism in a certain environment

Explanation:

An adaptation, also known as an evolutionary adaptation, can be defined as any physiological and/or morphological inherited trait related to the improved evolutionary fitness of one organism in a particular environment. An adaptation improves the chances of survival and reproduction in a certain environment, thereby organisms carrying the adaptation have more chances to produce descendants and pass their genes to the next generation. Some classical examples of evolutionary adaptations include the long necks of giraffes that help them to eat leaves at the top of trees, light bones of flying birds, etc.

Please answer quickly!! It would mean a lot (: uh have a great day and good luck with your own questions!


How is oxygen and carbon dioxide exchanged between the cells of the body?

Gas Exchange | Anatomy and Physiology II

Question 3 options:

oxygen moves from the blood into the cells of the body, and carbon dioxide moves from the cells of the body into the blood


both oxygen and carbon dioxide move from the blood into the cells of the body


carbon dioxide moves from the blood into the cells of the body, and oxgyen moves from the cells of the body into the blood


both oxygen and carbon dioxide move from the cells of the body into the blood

Answers

Answer:

oxygen moves from the blood into the cell and the cell uses it in cellular respiration and then the CO2 goes from the cell to the blood to get it back to the lungs to get rid of it

Explanation:

Outline the levels of organization starting with the smallest, organisms.

Answers

Answer:

Organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere. These have been arranged from the smallest to the largest. The biosphere is the largest level of organization while the organelle is the smallest. However, the basic form of life begins with the cell. Many cells together form a tissue and several tissue form an organ.

We respect Dr. Trudeau and all those earlier scientists who did the best they could within the contemporary understanding of the problem they addressed and utilizing the materials and technology they had at hand. Modern-day biologists like to talk about resistance/susceptibility genes and patterns of inheritance, rather than family blood. They think about infectious disease in terms of microbes and pathogenicity, rather than speaking of bad humors. They have identified vitamins and other nutrients that are abundant in some foodstuffs and lacking in other that are essential for optimal immune function. Without the benefit of such modern formulations, Dr. Trudeau, by a disciplined application of scientific curiosity and careful, clever methodology, shed light on each of these concerns, light that helped to illuminate the minds of scientists who came after. Still, a look at his original paper leaves us wondering, were the rabbits genetically identical? Probably not! Why? Were they all of the same sex and age? Couldn’t he have given the animals kept on short rations just a smaller amount of the same varieties of food available to the animals fed abundantly—after all, there might be some important nutrient missing in potatoes. In light of the title of the paper, why not measure bacterial numbers in the rabbits on post mortem rather than just survival time? (In a subsequent paper, he did exactly that.) Once you start critiquing an experiment from 100 years ago, or 10 years ago, or sometimes even last year, it’s hard to stop.

Can you think of anything else you would have changed about the Rabbit Island Experiment?

Answers

Answer:

Ala escala del uno al diez

What is the importance of crossing over and independent assortment?
O It allows for exact copies of the cells to be made
It allows for mitosis to occur properly
O It allows for genetic variation within species
It allows for the same gametes to be produced every time

Answers

In meiosis I, crossing over during prophase and independent assortment during anaphase creates sets of chromosomes with new combinations of alleles. Genetic variation is also introduced by random fertilization of the gametes produced by meiosis.

Fossils are preserved remains of ancient life. Which of the following would be considered fossils? A. hair and flesh of a woolly mammoth preserved in ice B. dinosaur footprints preserved in rock C. rock-like pieces of bones from an ancient fish D. all of the above ​

Answers

Answer:

d

Explanation:

please give brainlest need 2 more

If muscle A contracts and causes movement of some sort, and muscle B helps muscle
A accomplish this task, and muscle C does the opposite of A, then muscle A is a(n)
muscle, muscle B is a
muscle, and muscle C is aln)
muscle.

Answers

Answer:

RESPUESTA:OPCION B espero te ayude

A accomplish this task, and muscle C does the opposite of A, then muscle A is a antagonist to prime mover.

What is antagonist muscle?

muscles can only pull. They typically work a joint in pairs because of this. When a body part is moved, one of the pair's muscles contracts; when the body part is brought back to its starting position, the other muscle in the pair contracts.

Antagonizing pairs of muscles are those that function in this way. When two muscles are antagonistic, one contracts while the other relaxes or lengthens. The muscle that is lengthening or relaxing is referred to as the antagonist, while the muscle that is contracting is referred to as the agonist.

Therefore, A accomplish this task, and muscle C does the opposite of A, then muscle A is a antagonist to prime mover.

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jellyfish is considered as the deadliest marine animal in the world. how it causes fatal to human?​

Answers

Answer:

i got stung by a jellyfish :( anyways lol heres why they are fatal to humans

Explanation:

Their venom is considered to be among the most deadly in the world, containing toxins that attack the heart, nervous system, and skin cells. It is so overpoweringly painful, human victims have been known to go into shock and drown or die of heart failure before even reaching shore.


In the southeastern United States, there is a small type of lizard called a fence lizard. They have short legs and live under leaves and dead logs.
Over the last 70 years, fire ants have moved into the lizard's environment. When fire ants sting the lizards on their body, the lizards can die
Scientists have observed that in places with fire ants and lizards living together for a long time, the lizards have longer legs. In places where fire
ants have only been there a short time, the lizards' legs are shorter overall
Fire ants move into a new environment with the lizards. What will most likely happen to the lizard population over the next several years?
A. Some of the lizards would try to develop new traits to avoid the ants, and they would pass on those traits to their
offspring. The other lizards would die
B. All of the lizards would try to develop new traits to avoid the ants. They would all survive and pass on those traits to
their offspring
OC. Due to random mutations, some lizard offspring are born with different traits that help them avoid the fire ants. These
offspring will most likely survive and reproduce, while the lizards born without those traits will die.
Select an answer
Back
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o
M

Answers

Answer:

Answer is C. Due to random mutations, some lizard offspring are born with different traits that help them avoid the fire ants. These  offspring will most likely survive and reproduce, while the lizards born without those traits will die.

Explanation:

Please help me I don't understand

Answers

Answer:

D

Explanation:

All of the other options go against actual facts and the laws of biology

Which factor would increase population size?
a. more competitors
b. unable to hide, defend, or migrate
c. ability to resist disease
d. inadequate food and resources
e. extreme temperatures

Answers

Answer:

c

Explanation:

All the others would begin to kill off a population

What organelle does a plant cell have in common with bacterial cells, but not animal cells?​

Answers

Answer:

ribosomes

The Protein Factory. Plant, bacteria and animal cells all have ribosomes that contain RNA and proteins. Ribosomes translate nucleic acids into amino acids to make proteins. Proteins form enzymes and play a role in every function within cells.

Describe the results of a protozoan culture

Answers

I am not sure how to answer

A scientist wants to examine a genetic disease in humans. The scientist hypothesizes that the disease can be treated by using gene therapy. Humans take a long time to reproduce and develop, so the scientist will have to
give up on testing the hypothesis.
test the hypothesis for a very long time.
develop new methods to test the hypothesis.
find a way to make humans reproduce faster.

Answers

Answer:

answer is B

Explanation:

its on edg

Answer: C. develop new methods to test the hypothesis.

Explanation:

Humans should consider microbes as beneficial organisms for all of the following reasons except:
Group of answer choices

they purify water in the hydrosphere.

they consume carbon dioxide during photosynthesis.

they decompose organic waste in the geosphere.

they generate oxygen in the hydrosphere.

they filter ultraviolet radiation in the atmosphere.

Answers

Answer:

they purify water in the hydrosphere

Microbes are beneficial as well as detrimental to the environment. They do not purify water in the hydrosphere instead pollute them. Option (A) is correct.

How does microbes affect water quality ?

The quantity and variety of native microorganisms in an aquatic environment have a significant impact on water quality .

Physical, biological, and chemical contaminants from human activity can build up in aquatic systems and have significant ecological effects that can be detrimental in nature.

Microbial activity in the aquifer may have an impact on a number of ground-water quality indices, including pH, oxidation/reduction (redox) status, dissolved oxygen, or the presence of certain mineral components. This is especially true if there are elements in the aquifer that bacteria may use to flourish.

Therefore, option (A) is correct option.

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1- Explain the following expression:
"reversible manner".​

Answers

Answer: means that oxyhaemoglobin thus formed can break down at tissues to relaese haemoglobin and oxygen back

Explanation:gooooooooooooooooooooooogle

A. If 15 ml of a liquid has a mass of 11.85 grams,
(1) What is the density?
(2) What is the liquid?

Answers

Answer:

1. 0.79g/mL

2. Ethanol

Explanation:

The density of a substance can be calculated by using the formula;

Density (g/mL) = mass (g) ÷ volume (mL)

According to the information provided in the question, mass = 11.85grams, volume = 15mL.

Hence, density = 11.85g ÷ 15mL

= 0.79

Density of the liquid = 0.79g/mL.

Substances usually have their own unique density, which is one of the properties that distinguish them. In this case, ETHANOL is the liquid that possesses a density of 0.79g/mL.

A 30-year-old male demonstrated a subtle onset of the following symptoms: dull facial expression; droopy eyelids; puffiness of the face and periorbital swelling; sparse, dry hair; dry, scaly skin; evidence of intellectual impairment; lethargy; a change of personality; bradycardia (60 b/min) low range of normal; a blood pressure of 90/70 low BP; anemia low iron – cant transport O through body very well(hematocrit 27); enlarged heart (upon radiological exam); constipation, and hypothermia. Plasma concentrations of total and free T4 and T3 follow:
Radioimmunoassay (RIA) of peripheral blood indicated elevated TSH levels. A TSH stimulation test did not increase the output of thyroid hormones from the thyroid gland.

a. What endocrine organ is involved here?
b. Is this a primary or secondary disorder? Why? (Is a TSH or TRH determination necessary for your diagnosis?)
c. Describe the feedback loop involved, indicating if there is an increased or decreased TSH level.
d. List several defects that could cause these symptoms.
e. Would you expect to find a palpable goiter? Explain your answer.
f. Describe a suitable treatment for this individual.

Answers

Answer:

1. Thyroid gland is the endocrine gland that is involved here.

2. TSH stimulation test did not show an increase in the output of thyroid hormones secreted from thyroid glands which makes it a primary disorder. The determination of TSH or TRH gives an idea about hypothyroidism if it is due to feedback inhibition of the pituitary or absence of TSH hormone from the pituitary, however, Circulating levels of TRH not necessary.

3.  The feedback loop involves the following:

TRH hormone secreted from the hypothalamus triggers the anterior pituitary to secret TSH that in turn triggers the relapsing of the T3 and T4 levels by the thyroid glands. If there is a low level of T3 and T4 hormones then negative feedback takes place and increases the TSH output.

4.  symptoms:

Not able to uptake the iodide into the cells of the thyroid gland

Defects in the conversion of iodide to iodine

tyrosine molecule iodization

secretion of the hormones from the Tg molecules

Less TSH receptors on the gland.

5.  The chronic TSH stimulation due to negative feedback may cause hypertrophy of the gland, results in goiter formation.

6. synthetic hormone therapy is known as Synthroid such asT4 (L-thyroxine).

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