I need help figuring this out. Please

As saxitoxin inhibits the permeability of sodium ions by acting as antagonists, it will block the muscle action potential. Thus, the correct option is C.

Upon arrival of nerve impulse, acetylcholine is released from the synaptic end bulbs into the synaptic cleft. When acetylcholine binds to the receptor, it causes opening of ion channel which causes the inward movement of sodium ions into the muscle fibre. This triggers a muscle action potential.

Thus, if sodium ions are inhibited from flowing inwards by saxitonin, the muscle action potential will not occur.

Thu, the correct option is C.

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Answer:

Hardness (H) is the resistance of a mineral to scratching. The degree of hardness is determined by observing the comparative ease or difficulty with which one mineral is scratched by another or by a steel tool.

Explanation:

https://www.britannica.com/science/mineral-chemical-compound/Hardness Hope this helps

Answer:

50 %

Explanation:

Using a punnets square the four possible crosses are Hh, Hh, hh, and hh. This means there is a 50% chance the child has hh or hemophilia

Answer:

Science helped create almost everything today, medicinces,drought resistant food, technology, further education in doctoring, electricity etc.  

Explanation:

Answer:

Herbivores are organisms that eat plants only. Carnivores are organisms that eat other animals only (meat). Whereas, omnivores are organisms that eat both plants and animals.  

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Answer: A. neither can be accepted as correct because muscles growth is difficult to study in humans.

Explanation:

Hypertrophy can be defined as the increase in the fiber size of the muscle whereas the hyperplasia can be defined as the increase in the number of muscle fibers. Additionally the hypertrophy suggests that adding more proteins to the fibers is suggestive of the growth of the muscles. But these two theories cannot be directly related to the muscle growth in humans as the development and growth of muscles are dependent upon several factors like diet, any kind of disease which restrict the muscle growth and movement, physical activities, mineral availability responsible for growth, malnutrition, and others.

Answer:

A

Explanation:

Answer:

B

Explanation:

The correct option is "B" Natural selection does not impact reproduction rates according to the theory of Natural selection.

Natural selection is the process through which populations of living organisms adapt and change. There are four factors are required for natural selection are reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population.

Hence, the option is "B" Natural selection does not impact reproduction rates according to the theory of Natural selection.

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To control his blood glucose levels, Jose is likely counting grams of carbohydrates.

Carbohydrates are one of the three macronutrients, along with proteins and fats. Carbohydrates have the most significant impact on blood glucose levels as they are broken down into sugar (glucose) during digestion. When carbohydrates are consumed, they are converted into glucose, which is then absorbed into the bloodstream, leading to an increase in blood glucose levels.

By counting grams of carbohydrates, Jose can monitor and regulate his carbohydrate intake to manage his blood glucose levels. This can be particularly important for individuals with conditions such as diabetes, where controlling blood sugar levels is crucial for maintaining overall health and managing the condition effectively.

It's worth noting that other macronutrients, such as proteins and fats, also play a role in overall nutrition and may have an impact on blood glucose levels to a lesser extent. However, carbohydrates have the most significant and direct influence on blood glucose, making them the primary macronutrient of focus when it comes to blood glucose control.

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The model found in part (a) can not be used to predict the bone mineral density of a woman who consumes two cans of cola per day. To write the least-squares regression equation, and then use this equation to predict the bone mineral density for a woman weighing 68 kg.

Firstly, it is noteworthy that the predictor variable in the given regression model is "weight (kg)". In other words, the model is built on the association between the weight of women and their bone mineral density. Therefore, the independent variable in the regression model is "weight", not "consumption of cola".You can not use this model to predict the bone mineral density of a woman who consumes two cans of cola per day because the regression model does not involve the variable "consumption of cola". Since the given regression equation is solely built on the association between weight and bone mineral density, using this model to predict bone mineral density for a woman who consumes two cans of cola per day would lead to unreliable results.

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Answer:

The air in New York moves to the north.  

Explanation:

At a global level, it occurs unequal warming of the atmosphere, which depends on many factors and varies with latitude. These temperature differences occur because solar radiation reaches the earth differently at different latitudes degrees. The result is the formation of convective cells of atmospheric air circulation: Hardley cell, Ferrel cell, and Polar cell.    

The term convective cell refers to air getting warm, expanding, getting less dense, and ascending. During ascension, it gets colder because of the change in high, contracting, becoming thicker. Finally, it descends.

In each hemisphere, warm air ascends at the equator and approximately at 60º latitude. Cold air descends at approximately 30º latitude and the poles. These air masses circulation generates superficial winds that blow toward the equator between 0º-30º, and toward the poles between 30º-60º lat.  

Ferrel cell occurs between 30º and 60º latitude. At 30º lat, the cold air coming from the north in the tropopause meets the cold air coming from 0º, and both descend to lower altitudes due to its density and low temperature. When these air masses reach the ground, they diverge.  One part goes to 0º lat, while the other part goes forward to the north.  As it moves north, it gets warmer for being at lower altitudes. At 60º, this warm air coming from the 30º meets the polar air coming from 90º, and as it is warmer it ascends again. When it ascends to the tropopause, it is pushed by new air and moves to the south again. While doing so, it loses heat and becomes denser, descending again at 30º.  And so the cycle starts all over again. New York is located at 40º latitude approximately, so air goes forward to the north pole near the ground, but at 60º it elevates again. New York is then affected by the Ferrel cell.        

In the attached image you will find the three cells, circulating in different directions.  

Answer:

The correct answer is D ''inclination for certain cognitive processes to be specialized to one hemisphere of the brain or the other.'

Explanation:

Lateralization refers to the different specialization of the cerebral hemispheres, that is, it is the functional specialization of the nervous system that is observed to a different degree on one side or the other of the neuroaxis. Our brain is subdivided into two hemispheres, the right and the left. The left hemisphere is more specialized in language and control of emotions and the right in spatial thinking, perception of emotions and facial recognition.

Answer:

Vaccines prevent diseases, its just proven. Most Anti Vaccers end up getting Measles, etc. But people with vaccines usually dont.

Explanation:

we are living proof to be honest, i got the chicken pox vaccine and never had it once in my life. Same thing with many other diseases we get vaccinated for.    

Answer:

False, I believe. Mutations sometimes might have an effect that helps the population. Example: I've heard of Two-Headed snakes, and even seen some on the internet. They live their lives just fine, so I suppose the mutation was actually quite helpful.

Answer:

false

Explanation:

Answer:

The wings of birds and bats.

Explanation:

The wings of birds and bats is the example of analogous structures. Analogous structures refers to those structures that are similar in those organisms that are unrelated or different to one another. The wing structures are similar in both birds and bats because they are evolved to do the same job which flying. It is not evolved because they were inherited from a common ancestor. These wing structure of both bat and bird look similar from the outside but internally they are totally different from one another.

Answer:

the thrid one is the best one

The image that best illustrates the magma convection currents within Earth’s interior is the bottom left.

Convection may be defined as a process through which the transfer of heat due to the bulk movement of molecules within a fluid takes place. The current which is produced by the movement of these molecules is known as the Convection current.

Convection currents are present in the mantle region of the earth's surface. In the process of heating, magma rises from deep inside the mantle and then cooled the mantle as it flows down. This cyclic movement of magma constructs convection current within the region of the earth's interiors.

Therefore, the image that best illustrates the magma convection currents within Earth’s interior is the bottom left.

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Answer:

D. RNA is single stranded , contains uracil, sugar is ribose

Answer:

D. RNA is single stranded , contains uracil , sugar is ribose

Explanation:

RNA contains the sugar ribose, while DNA contains the slightly different sugar deoxyribose

Answer:

B the sun appears lower in the sky

Answer:

Your carbon atom enters the leaf as CO2 (carbon dioxide) from the atmosphere. In the leaf, chlorophyll uses the energy from the sun to convert CO2 and H2O to the sugar glucose, C6H12O6. Your carbon atom is part of this molecule; it is now one of the carbons in the glucose.

Next, the glucose carrying your carbon atom is sent down the phloem tissue of the carrot plant to the root, which is the carrot itself. Enzymes in the carrot root connect the glucose molecule with your carbon atom into a chain with other glucose molecules, forming cellulose, or plant starch, and there you go. Your carbon atom went from being part of an atmospheric gas to a starch via photosynthesis and starch formation in the root.

Explanation:

AAnswer:A

Explanation:because why not

Answer:

Explanation:

In terms of old school electron shells - One Hydrogen atom on it's own has an empty shell, and therefore to fill the shell it needs another electron. In the case of Helium, it already has two electrons at the same energy level - so it cannot accept any new electrons i.e. it cannot form new bonds.

Answer:

Hydrogen atoms can form a molecule as 2 hydrogen atoms together can result in a low energy combination of 2 electrons of the same energy level.

Explanation: Helium atoms already have 2 electrons of the same energy so therefore it cannot accept more.

Answer:

be more speific in your question

Explanation:

Answer:

there are 4 type of body cell

Answer:

its the nervous system and the endocrine system

Explanation:

the nervous and the endocrine are the bodys main regulators

land needed for solar to supply all the energy needs of the USA is Energy production / 20 W/ft².

To determine the land needed for solar energy to supply all the energy needs of the USA, we need to consider the total energy consumption of the country and the efficiency of solar panels.

The energy consumption of the USA varies over time, but according to the U.S. Energy Information Administration (EIA), the total primary energy consumption in 2020 was approximately 92.94 quadrillion British thermal units (Btu).

To convert the energy consumption into the energy produced by solar panels, we need to consider the efficiency of solar panels. The efficiency of solar panels can vary, but let's assume an average efficiency of 20%. This means that solar panels can convert 20% of the sunlight they receive into usable electricity.

Now, we can calculate the energy production from solar panels:

Energy production = Energy consumption / Solar panel efficiency

Energy production = 92.94 quadrillion Btu / 20%

To convert the energy production into the area of land needed, we need to consider the average energy production per unit area of solar panels. The average energy production of solar panels can vary based on factors such as location, sunlight intensity, and panel technology. Let's assume an average energy production of 20 watts per square foot (W/ft²).

Now, we can calculate the land needed:

Land needed = Energy production / Average energy production per unit area

Land needed = Energy production / 20 W/ft²

The resulting value will be in square feet (ft²), representing the land area needed for solar panels to supply all the energy needs of the USA.

It's important to note that this calculation provides a general estimation based on the given assumptions of energy consumption, solar panel efficiency, and average energy production per unit area. The actual land needed may vary depending on specific factors and technological advancements in the future.

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An extremely small population with little to no migration can have several effects.

These effects include an increased risk of genetic drift and inbreeding depression.

Genetic drift: Genetic drift is a random change in allele frequencies that occurs in small populations. Since smaller populations have less genetic variation, genetic drift is more common. Genetic drift can reduce genetic diversity in a population, which can lead to the fixation of deleterious alleles.

Inbreeding depression: Inbreeding depression is a loss of fitness that occurs when closely related individuals mate and produce offspring. Inbreeding depression can occur when a population becomes small and isolated, and the mating pool is reduced. Inbreeding depression can lead to reduced fertility, increased susceptibility to disease, and lower survival rates.

Additionally, inbreeding depression can reduce genetic diversity in a population, which can make it more susceptible to environmental change. Therefore, an extremely small population with little to no migration can lead to an increased risk of genetic drift and inbreeding depression.

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Explanation:

A because in the pental development the men and women sex others for there fun and baby in this ara