Which of these is an example of genetic variation?

A. Two lizards are fighting and one loses its tail.

B. Bacteria reproduce asexually and produce two clones.

C. Two sisters are born with brown hair and one dyes their hair blonde.

D. In butterflies, some are born with more dark colored spots than others.

(D)

Explanation:

Why (A), (B) and (C) don't make sense:

(A) you can't get high energies by breaking low-energy bonds. Simple law of energy conservation at work prevents it from happening.

(B) & (C) adding protons to the nucleus is not feasible due to the natural repulsion between protons. By the same token, protons cannot be removed from the nucleus by external means because of the incredibly powerful nuclear forces that bind the protons and neutrons together.

Why (D) is the correct answer:

It takes a lot of energy to hold the nucleus together. But by introducing neutrons into the nucleus, the nucleus can be rendered unstable and become radioactive. So when the nucleus breaks up, the energy that used to hold it together is now released and this energy can be harnessed to generate power.

Increasing the particle size of the column packing in an HPLC column will have an impact on all three terms of the Van  equation. The first term, A, which represents the kinetic term or the rate at which the solute moves through the column, will be unaffected by the increase in particle size.

However, the second term, B, which represents the longitudinal diffusion of the solute in the column, will decrease as the particle size increases. This is because the larger particles will provide more resistance to diffusion, thus reducing the contribution of B to the overall plate height. The third term, C, which represents the resistance to mass transfer caused by the equilibrium between the solute in the mobile phase and the stationary phase, will also decrease as particle size increases.

This is because the larger particles will provide more surface area for the interaction between the mobile and stationary phases, reducing the resistance to mass transfer. Overall, increasing the particle size of the column packing in an HPLC column will lead to a decrease in plate height and improved separation efficiency, particularly for larger molecules.

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Answer: Molecules are not attracted

Explanation:

Answer:

The bonds must be non-polar.

Explanation:

The water molecules are polar, so they wouldn't be attracted to the surface. This means the water would bead up and curve away from the surface it landed on.

When water beads up, this happens because the water molecules are more strongly attracted to each other by the polar bonds than they are to the surface by non-polar interactions.

To summarize:

On a nonpolar layer, water beads up because the attraction to each other is stronger than the surface.

Hope this explained it well.

The release of neurotransmitters into the synapse is initiated by depolarization, which opens Ca2+ channels, allowing Ca2+ to move vesicles to the synaptic membrane.

This is the correct answer.When an action potential (AP) arrives at the axon terminal, it results in the opening of voltage-gated Ca2+ channels. The influx of Ca2+ into the nerve terminal causes the exocytosis of neurotransmitter-containing vesicles into the synaptic cleft. Calcium influx is thought to trigger neurotransmitter release via a mechanism that involves Ca2+ binding to the vesicle-associated protein synaptotagmin 1 (Syt1), which promotes the interaction of vesicles with the presynaptic membrane.The entry of Ca2+ through voltage-gated calcium channels is critical for neurotransmitter release, and its absence leads to severe neurological disorders such as ataxia and epilepsy. Calcium ion (Ca2+) is one of the most crucial signaling molecules in cells and is essential for many physiological functions, including neurotransmitter release. Calcium ions activate synaptic vesicle fusion and neurotransmitter release by binding to specific proteins in the active zone of the nerve terminal.

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The heat absorbed when 516 g of ice at -14.1°C melts and then the water is converted to steam at 145.0°C is approximately 1.54 × 10^6 J.

To calculate the heat absorbed during the process described, we need to consider the different stages involved: melting the ice and then converting the water to steam. We'll calculate the heat absorbed at each stage and add them together.

1. Heat absorbed to melt the ice:

The formula to calculate the heat absorbed during the melting process is:

Q = m * ΔH_fusion

where Q is the heat absorbed, m is the mass, and ΔH_fusion is the heat of fusion.

Given:

Mass of ice (m) = 516 g

Heat of fusion (ΔH_fusion) = 6.01 × 10^3 J/mold (converted to J/g by dividing by the molar mass of water, 18.015 g/mold)

First, we need to calculate the number of moles of ice:

moles = mass / molar mass

moles = 516 g / 18.015 g/mold ≈ 28.63 mold

Now we can calculate the heat absorbed to melt the ice:

Q_ ice = m * ΔH_fusion

Q_ ice = 516 g * (6.01 × 10^3 J/mold / 18.015 g/mold)

Q_ ice ≈ 172,110 J

2. Heat absorbed to raise the temperature of water from 0°C to 100°C:

The formula to calculate the heat absorbed during this process is:

Q = m * C * ΔT

where Q is the heat absorbed, m is the mass, C is the specific heat capacity, and ΔT is the change in temperature.

Given:

Mass of water (m) = 516 g

Specific heat capacity of water (C) = 4.18 J/(g° C)

Temperature change (ΔT) = 100°C - 0°C = 100°C

Q_ water = m * C * ΔT

Q_ water = 516 g * 4.18 J/(g° C) * 100°C

Q_ water = 215,232 J

3. Heat absorbed to vaporize the water:

The formula to calculate the heat absorbed during vaporization is:

Q = m * ΔH_vaporization

where Q is the heat absorbed, m is the mass, and ΔH_vaporization is the heat of vaporization.

Given:

Mass of water (m) = 516 g

Heat of vaporization (ΔH_vaporization) = 4.07 × 10^4 J/mold (converted to J/g by dividing by the molar mass of water, 18.015 g/mold)

Now we need to calculate the number of moles of water:

moles = mass / molar mass

moles = 516 g / 18.015 g/mold ≈ 28.63 mold

Now we can calculate the heat absorbed to vaporize the water:

Q_ vaporization = m * ΔH_vaporization

Q_ vaporization = 516 g * (4.07 × 10^4 J/mold / 18.015 g/mold)

Q_ vaporization ≈ 1,157,714 J

Total heat absorbed:

Total Q = Q_ ice + Q_ water +Q- Vaporization

Total Q ≈ 172,110 J + 215,232 J + 1,157,714 J

Total Q ≈ 1,544,056 J

The heat absorbed when 516 g of ice at -14.1°C melts and then the water is converted to steam at 145.0°C is approximately 1.54 × 10^6 J.

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The type of adaptation shown by the dart frog is physiological adaptation while the one shown by the Hosta plant is structural adaptation.

Adaptation generally refers to the process by which living organisms adjust in order to continue to survive in an environment.

There are 3 main types of adaptations:

In behavioral adaptation, organisms change their behavior for their continued survival in their environments. Without these modifications, they may find it to survive and reproduce in the environment.

Physiological adaptation refers to changes that are encoded into the system of organisms. Changes that are not behavioral nor structural but ensure the continued survival of organisms in their environment.

Structural adaptation refers to the modification of physical structures for continued survival. These modifications become necessary because the environment keeps changing.

Thus, bright coloration as a warning to predators by the dart frog is a physiological adaptation while the development of big leaves that ensures that as much sunlight as possible is received by the Hosta plant is a structural adaptation.

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Answer:

Mk but in just a minute I gotta go for a sec and do my homework.

Explanation:

An experiment that could prove all cells come from preexisting cells would involve observing the process of cell division under a microscope.

To prove all cells come from preexisting cells, we can do the following steps. First, obtain a sample of living cells, such as a slice of the onion root tip. Place the sample on a microscope slide and add a stain to make the cells more visible. Next, use a microscope to observe the sample at high magnification. Look for cells that are in the process of dividing, which can be identified by the presence of a structure called the mitotic spindle.
Observe the process of cell division over time, noting how the parent cell divides into two daughter cells. Repeat this process with multiple samples to ensure that the results are consistent.

This experiment demonstrates that all cells come from preexisting cells, as new cells are created through the process of cell division. Without a parent cell, new cells cannot be formed.

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The final temperature of the Delorean is approximately 62.0089°C.

Using the formula Q = m * c * ΔT, where Q is the heat energy transferred, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature:

Q = 4,500,000 J

m = 2,000,000 g

c = 1.12 J/g°C

Rearranging the formula, we get:

ΔT = Q / (m * c)

ΔT = 4,500,000 J / (2,000,000 g * 1.12 J/g°C)

ΔT = 2.0089°C

The change in temperature is 2.0089°C. To find the final temperature, we add this to the initial temperature of 60°C:

Final temperature = 60°C + 2.0089°C = 62.0089°C

Therefore, the final temperature of the Delorean is approximately 62.0089°C.

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To dissolve 257.01 g of Ba(OH)2 in a 0.5 L solution, you would need a volumetric flask with a capacity of at least 0.5 L. Typically, a 500 mL volumetric flask would be suitable for preparing a 0.5 L solution.

To make a 0.5 L (500 mL) solution of 3M Ba(OH)2, you would need to select a volumetric flask with a capacity of at least 0.5 L to accommodate the solution.

Since the molarity (M) of the solution is given, which represents moles of solute per liter of solution, you need to determine the number of moles of Ba(OH)2 required.

Moles = Molarity x Volume (in liters)

For a 0.5 L solution of 3M Ba(OH)2, the number of moles can be calculated as:

Moles = 3 mol/L x 0.5 L = 1.5 moles

Ba(OH)2 has a molar mass of approximately 171.34 g/mol.

Mass = Moles x Molar mass

Mass = 1.5 moles x 171.34 g/mol = 257.01 g

To dissolve 257.01 g of Ba(OH)2 in a 0.5 L solution, you would need a volumetric flask with a capacity of at least 0.5 L. Typically, a 500 mL volumetric flask would be suitable for preparing a 0.5 L solution.

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Answer:

Explanation:

The standard system of measurement is what is popularly referred to as SI unit (or international system of units). For example, the SI unit for length is basically in meters (m), which is convertible to millimeter (mm), centimeter (cm) or even kilometer (km).

If there is no standard system of measurement,

1) Scientists will not be able to compare data as every scientist will use a unit that suits him/herself which might make data incomparable as some units might be difficult to convert to other units or there conversion methods might even be debatable.

2) There might be a general lack of understanding of the research work done by a scientist/scientists in the scientific community. This is because the standard system of measurement affords scientists to communicate properly with the same or convertible units and based on 1. above, if scientists use any unit that isn't agreed upon, different/unknown/debatable units might make understanding of research works incomprehensible.

Answer:

Chemical energy is the potential energy stored in the arrangement of atoms within molecules. Breaking chemical bonds requires energy, while forming new chemical bonds releases energy. The more energy that's released when a bond forms, the more stable that bond is.

Explanation:

Answer:

C. nonliving.

Explanation:

Explanation:

mass of a unit volume of a material substance

Answer:

Liquids have more kinetic energy than solids. When a substance increases in temperature, heat is being added, and its particles are gaining kinetic energy. Because of their close proximity to one another, liquid and solid particles experience intermolecular forces. These forces keep particles close together.

Explanation:

hope it helps U

Answer:D

Explanation:

i got it right LOL

Among the given options, the one which is not a major function of musculoskeletal system is helping the lungs take in air. All others including, energy, digestion, movement of bones etc. are its function.

The musculoskeletal system in human body is composed of muscles and bones. The bones in our body are wrapped by the muscles. Muscles helps for the smooth movement of bones.

Muscles convert the chemical energy from food into kinetic energy and use  it for the movement of muscles and bones. Muscles contraction needs intake of energy.

The contraction and relaxation of smooth muscles helps for the easy movement of food through the digestive track. Musculoskeletal system also helps for the movement of other organ system. Hence, option b is not the major function of this organ system.

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Answer:

Instead, pour a small amount into a beaker or clean weigh dish. Once you have added a chemical to a container, label it promptly. When you are finished with the experiment, dispose of the excess chemical as chemical waste. Do not simply pour the excess chemical down the sink.

Answer:

  the number of neutrons in the nucleus

Explanation:

The mass number 205 is the total number of protons and neutrons in the nucleus. Lead has 82 protons, so a mass number of 205 indicates a nucleus with 123 neutrons.

Similarly, the mass number 208 indicates a lead nucleus with 126 neutrons.

The difference in atomic structure is the difference in the number of neutrons in the nucleus.

Explanation:

The reaction between magnesium ribbon and dilute hydrochloric acid is a classic example of a single replacement reaction, which can be represented by the following chemical equation:

Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)

In this reaction, magnesium (Mg) reacts with hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2).

The rate of this reaction can be altered by changing the concentration of the hydrochloric acid. This is because the rate of a chemical reaction depends on the concentration of the reactants. Specifically, the rate of the reaction is proportional to the concentration of the reactants raised to some power, which is determined by the reaction's rate law.

In this reaction, the rate law can be expressed as:

Rate = k [Mg] [HCl]^x

Where k is the rate constant and x is the order of the reaction with respect to hydrochloric acid. The order of the reaction with respect to magnesium is one, since the concentration of magnesium does not change during the reaction.

When the concentration of hydrochloric acid is increased, the rate of the reaction increases because there are more hydrochloric acid molecules available to collide with magnesium atoms and react. This means that the value of x is greater than zero and the reaction is dependent on the concentration of hydrochloric acid.

Conversely, when the concentration of hydrochloric acid is decreased, the rate of the reaction decreases because there are fewer hydrochloric acid molecules available to react with magnesium. This means that the value of x is less than one and the reaction is not entirely dependent on the concentration of hydrochloric acid.

The mass of (NH4) 2S in the solution is : Mass = 0.0600 mol × 60.08 g/mol = 3.60 g.

The given molarity and volume of the solution can be used to calculate the number of moles of ammonium sulfide (NH4)2S.Then, the number of moles can be converted to mass using the molar mass of (NH4)2S.Mass of ammonium sulfide (NH4)2S in 3.00 L of a 0.0200 M solution is given by : Mass = moles × molar mass.The number of moles of (NH4)2S can be found using the equation:Molarity = Number of moles / Volume.Rearranging this equation, we get:Number of moles = Molarity × Volume Number of moles of (NH4)2S = 0.0200 M × 3.00 L.Number of moles of (NH4)2S = 0.0600 mol.The molar mass of (NH4)2S can be calculated by summing the molar masses of ammonium (NH4) and sulfide (S) ions.Molar mass of (NH4)2S = (2 × Molar mass of NH4) + Molar mass of S= (2 × 14.01 g/mol) + 32.06 g/mol= 60.08 g/mol.

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Reaction appears to get heavier as molar mass of Magnesium oxide is more than the molar mass of reactants.

Molar mass: It is defined as the sum of atomic mass of each atom in a molecule or compound. If its only an element, then molar mass is same as the atomic mass of that element.

Calculate the molar mass of Magnesium oxide.

\(Molar\ mass\ of\ MgO = Atomic\ mass\ of\ Mg\ +Atomic\ mass\ of\ O\= = 24.305\ g/mol + 16.000\ g/mol\\ Molar\ mass\ of\ MgO = 40.305\ g/mol\)

\(2Mg + O_{2}\)→\(2MgO\)

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The d-orbital starts in the third energy level (n = 3) of an atom.

Each energy level can contain one or more sublevels, including s, p, d, and f sublevels. The first energy level (n = 1) has one s orbital and can hold a maximum of 2 electrons. The second energy level (n = 2) has one s orbital and three p orbitals, allowing for a maximum of 8 electrons. The third energy level (n = 3) has one s orbital, three p orbitals, and five d orbitals, accommodating a maximum of 18 electrons.

The d-orbitals are found in the third energy level, corresponding to the third period of the periodic table. Therefore, the period number for the energy level where the d-orbital starts is 3.

The filling order of orbitals follows the pattern: 1s, 2s, 2p, 3s, 3p, 4s, 3d, and so on. The d-orbitals start filling after the p-orbitals in the third energy level. The electron configuration for the third energy level is written as 3s^2 3p^6 3d^1-10, depending on the element.

For example, the electron configuration of iron (Fe) is 1s^2 2s^2 2p^6 3s^2 3p^6 3d^6 4s^2. This configuration indicates that the d-orbitals of iron are half-filled with 5 electrons.

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Answer:

the answer is is C 465 grams

Answer:

1. Zinc

Zinc also plays a vital role in our body because it is the main component of all cells and also provides protection against microbes. It is also needed for the production of DNA and protein. Zinc is good to take when you are feeling sick with a cold or even a sore throat. But Zinc in excess amount can cause copper deficiency, upset stomach aches, and diarrhea

2.Iron

Iron is a major component of hemoglobin which is responsible for the transportation of oxygen from the lungs to all cells of the body. Women take to iron a lot to give them energy after childbirth because they become iron deficient. Iron in excess can have a negative effect on our body such as it causes liver disease (cirrhosis, cancer), heart attack, diabetes and sometimes it causes death.

Explanation:

If we are considering things from the point of view of hedonism, the best answer would be-

Some pleasures are easy to experience, temporary, and are primarily about satisfying physical needs - but not all pleasures are like this. Hedonism is a philosophical concept that emphasizes the pursuit of pleasure and the avoidance of pain as the ultimate goals of life. However, hedonism does not necessarily argue that all pleasures are purely physical or solely focused on immediate gratification. It recognizes that there can be different kinds of pleasures, including intellectual, spiritual pleasures, which may not be solely tied to satisfying physical needs.

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Answer:

Describes its potential to undergo some chemical change or reaction by virtue of its composition

Answer :position

Explanation:

Potential energy is the energy stored in an object due to its position

Answer: The correct answer is heat will flow from the boiling water into the frozen metal.

Explanation:

According to the law of conservation of energy, energy cannot be destroyed nor created but it can be transformed from 1 form to another form.

There are 3 processes of heat transfer:

The heat moves from a hot surface to a cold surface to maintain equilibrium.

We are given:

A metal is placed in a freezer (cold object) and another metal is placed in an oven (hot object) and then both the metals are placed in boiling water.

Initially, the heat will flow from the boiling water (hot object) into the frozen metal (cold object) to maintain equilibrium

Hence, the correct answer is heat will flow from the boiling water into the frozen metal.

Answer:A)molecule

Explanation:

Answer:

(A) molecule is correct

Explanation:

I did the quiz :3