only 20 plant species, such as rice, corn,and barely, make up the main sources of food for the entire human population.

what best describes the reason for maintaining the biodiversity of these plants species?

A.)to prevent famines
B.)to prevent pollution
C.)to preserve the beauty of nature
D.)to enhance the survival
please let ne know.​

They appear as the trait over a recessive allele. Statement C) is true about the dominant alleles.

Dominant alleles are genetic variants that, when present in an individual's genotype, are expressed phenotypically, meaning they determine the visible or observable traits. Dominant alleles are represented by capital letters, while recessive alleles are represented by lowercase letters in genetics.

In terms of inheritance, if an individual has at least one copy of the dominant allele, it will be expressed in the phenotype, regardless of the presence of a recessive allele. This is because dominant alleles exert their influence over recessive alleles, thus "dominating" their expression.

To illustrate this, let's consider a specific example using a trait controlled by a single gene with two possible alleles: dominant (A) and recessive (a). If an individual is homozygous dominant (AA), meaning they possess two copies of the dominant allele, the dominant trait will be expressed.

However, if an individual is homozygous recessive (aa), with two copies of the recessive allele, the recessive trait will be expressed since there are no dominant alleles to override it.

Therefore, dominant alleles appear as the trait over recessive alleles, regardless of the presence or absence of a recessive allele. The presence of even a single copy of the dominant allele is sufficient for its expression in the phenotype. Option C

For more such questions on  recessive allele visit:

https://brainly.com/question/16048928

#SPJ8

Ne is a noble gas, O is a non metal and Br is an halogen.

K is a metal that belongs to the same group as Na, it means that they have similar chemical properties.

It means that the answer is K.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.

The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.

This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.

Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

For more question on photoelectric

https://brainly.com/question/1458544

#SPJ8

One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns.

During El Niño years, Christchurch may experience cooler air temperatures due to several factors associated with the El Niño phenomenon.

El Niño is characterized by the abnormal warming of the surface waters in the eastern tropical Pacific Ocean, which has global climatic implications. While El Niño is primarily associated with changes in oceanic conditions, its effects can extend to atmospheric patterns, leading to altered weather patterns and temperature variations.

One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns. El Niño can disrupt the normal global atmospheric circulation, resulting in changes in the positioning and intensity of weather systems.

This can lead to the advection of cooler air masses from the south or southeast towards Christchurch, resulting in cooler temperatures.

Another factor is the influence of El Niño on regional rainfall patterns. El Niño often leads to drier conditions in the South Island of New Zealand, including Christchurch.

Reduced cloud cover and less moisture in the air can contribute to cooler temperatures as there is less insulation from the sun's radiation and less evaporative cooling. Additionally, the absence of significant rainfall can result in less moisture in the soil, leading to cooler conditions as less energy is used for evaporation.

For more such questions on temperatures visit:

https://brainly.com/question/4735135

#SPJ8

This element is nonmetal and appears in the periodic table.

The number that represents the position of the elements is called, the atomic number, it also represents the number of protons = numbers of electrons an atom has.

Answer: D. the atomic number

Answer:

Explanation:

Amount of phosphorus pentachloride reacted = 0.75 M - 0.65 M = 0.10 M

PCl₅(g) --------> PCl₃(g)+ Cl₂(g)

1 mole               1 mole      1 mole

Amount of phosphorus pentachloride reacted = 0.75 M - 0.65 M = 0.10 M

PCl₃(g) and  Cl₂(g) formed are .10 M and .10 M

Keq = [ PCl₃] x [ Cl₂ ] / [ PCl₅ ]

= .10 M x .10 M / .65 M

= .0154

B ) is the correct choice .

Answer:

he correct equilibrium constant expression (Keq) for the given equation is:

Keq = ([HCl]^4 [O2]) / ([Cl2]^2 [H2O]^2)

Where [HCl], [O2], [Cl2], and [H2O] represent the equilibrium concentrations of the respective species in the balanced equation.

Note that the Keq expression includes only the concentrations of the gases in the equilibrium mixture, and the coefficients in the balanced equation are used as exponents to represent the stoichiometry of the reaction.

([HCl]⁴ [O\(_2\)]) / ([Cl\(_2\)]² [H\(_2\)O]²)  is the correct equilibrium constant expression for this equation. The reaction quotient value obtained from the expression describing chemical equilibrium.

The reaction quotient value obtained from the expression describing chemical equilibrium is the equilibrium constant. It is influenced by temperature and ionic strength and is unaffected by the amounts of product and reactant in a solution.

Reactions which attain heterogeneous equilibrium have more than one phase. Typically, only two phases—such as gaseous and liquid phases and solids and liquids—are present. The expression for equilibrium does not include solids.

Keq = ([HCl]⁴ [O\(_2\)]) / ([Cl\(_2\)]² [H\(_2\)O]²)

Therefore, ([HCl]⁴ [O\(_2\)]) / ([Cl\(_2\)]² [H\(_2\)O]²) is the correct equilibrium constant expression for this equation.

To know more about equilibrium constant, here:

https://brainly.com/question/30620209

#SPJ5

Answer:

Explanation:

Plates at our planet's surface move because of the intense heat in the Earth's core that causes molten rock in the mantle layer to move.

Answer: Heat

Explanation:

The plates can be thought of like pieces of a cracked shell that rest on the hot, molten rock of Earth's mantle and fit snugly against one another. The heat from radioactive processes within the planet's interior causes the plates to move, sometimes toward and sometimes away from each other.

Explanation:

To determine the number of molecules in 280.4 g of SO3, we need to use the following steps:

Calculate the molar mass of SO3:

S = 32.06 g/mol

O = 3 x 16.00 g/mol = 48.00 g/mol

Molar mass of SO3 = 32.06 + 48.00 = 80.06 g/mol

Use the molar mass to convert grams to moles:

280.4 g SO3 x (1 mol SO3/80.06 g SO3) = 3.502 mol SO3

Use Avogadro's number (6.022 x 10^23 molecules/mol) to convert moles to molecules:

3.502 mol SO3 x (6.022 x 10^23 molecules/mol) = 2.106 x 10^24 molecules of SO3

Therefore, there are approximately 2.106 x 10^24 molecules of SO3 in a 280.4 g sample of SO3.

Answer:

acidic

Explanation:

Answer:

K₂SO₄(aq)  + 2AgNO₃ (aq) →  2KNO₃(aq) + Ag₂SO₄ (s) ↓

2Ag⁺ (aq) + SO₄⁻²(aq) ⇄ Ag₂SO₄ (s) ↓

Explanation:

Our reactants are: K₂SO₄ and AgNO₃

By the solubility rules, we know that sulfates are insoluble when they react to Ag⁺, Pb²⁺, Ca²⁺, Ba²⁺, Sr²⁺, Hg⁺

We also determine, that salts from nitrate are all soluble.

The reaction is:

K₂SO₄(aq)  + 2AgNO₃ (aq) →  2KNO₃(aq) + Ag₂SO₄ (s) ↓

2Ag⁺ (aq) + SO₄⁻²(aq) ⇄ Ag₂SO₄ (s) ↓

The most similar element to an element is Nihonium.

A chemical element is a chemical substance that cannot be broken down into other substances. Atoms are the fundamental building blocks of chemical elements, and the number of protons in each atom's nucleus determines which chemical element it belongs to.

Furthermore, a substance whose atoms all contain the same number of protons is said to constitute an element; alternatively, all the atoms of a certain element must contain the same number of protons. Chemical reactions cannot degrade elements since they are the simplest chemical forms.

Learn more about chemical elements here:

https://brainly.com/question/28376204

#SPJ1

We can see that an atom with 14 protons, 14 neutrons, and 16 electrons is unstable, and has a -2 charge.

So the correct option is the third one.

An atom with 14 protons, 14 neutrons, and 16 electrons is not stable. The number of protons in an atom, also known as its atomic number, determines its element and its chemical properties. In this case, the atom has 14 protons, which corresponds to the element silicon (Si) on the periodic table.

For an atom to be stable, it should have a balanced number of protons and electrons. Electrons are negatively charged particles that orbit the nucleus of an atom in energy levels or electron shells. The number of electrons in a stable atom should be equal to the number of protons, resulting in a neutral charge overall.

In this case, the atom has 14 protons and 16 electrons, which means it has two more electrons than protons, resulting in a net charge of -2. This is an example of an ion.

Learn more about atoms.

https://brainly.com/question/17425565

#SPJ1

The moles of Cl₂(g) will be present at equilibrium is 3.94 × 10⁻⁴ mol

To determine the number of moles of Cl₂(g) at equilibrium, we need to use the given equilibrium constant (Kₑ) and the initial concentrations of CO(g) and COCl₂(g).

Given:

[CO(g)] = 0.3500 mol

[COCl₂(g)] = 0.05500 mol

Kₑ = 1.2 × 10²

The balanced equation for the reaction is:

CO(g) + Cl₂(g) ⇌ COCl₂(g)

Let's denote the number of moles of Cl₂(g) at equilibrium as x. At the start, we have [Cl₂(g)] = 0 mol, but it will change by x at equilibrium.

Using the equilibrium expression, we can write:

Kₑ = [COCl₂(g)] / ([CO(g)] * [Cl₂(g)])

Plugging in the values:

1.2 × 10² = [COCl₂(g)] / (0.3500 * [Cl₂(g)])

To solve for [Cl₂(g)], we need to isolate it on one side of the equation:

[Cl₂(g)] = [COCl₂(g)] / (0.3500 * Kₑ)

Now, let's substitute the given values:

[Cl₂(g)] = 0.05500 / (0.3500 * 1.2 × 10²)

[Cl₂(g)] ≈ 3.94 × 10⁻⁴ mol

Therefore, approximately 3.94 × 10⁻⁴ moles of Cl₂(g) will be present at equilibrium.

Know more about moles here:

https://brainly.com/question/29367909

#SPJ8

The question was Incomplete, Find the full content below:

Starting with 0.3500 mol CO(g) and 0.05500 mol COCl₂(g) in a 3.050-L flask at 668 K, how many moles of Cl₂(g) will be present at equilibrium

CO(g) + Cl₂(g) ⇄ COCl₂(g)  Ke 1.2 x 10^{2} at 668 K

From the calculations, the heat of the reaction is 44.4 kJ/mol.

The enthalpy of reaction refers to the amount of heat that is absorbed or evolved in a reaction.

Number of moles of NaOH = 1.1 g /40 g/mol = 0.0275 moles

Mass of the water = 22.1 mL or 22.1 g

Given that;

H= mcdT

H = 22.1 g *4.184 * (31.4 - 18.2)

H = 1221 J or 1.221kJ

ΔH rxn = -(1.221kJ)/0.0275 moles

ΔH rxn = 44.4 kJ/mol

Learn more about enthalpy:https://brainly.com/question/15319033

#SPJ1

Answer:

Uh to answer the question we need to SEE the statements..

The reaction becomes spontaneous at approximately 2667 Kelvin.

To determine the temperature at which a nonspontaneous reaction becomes spontaneous, we can use the equation ΔG = ΔH - TΔS, where ΔG is the change in Gibbs free energy, ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy.

In this case, we are given ΔH = 144 kJ/mol and ΔS = 54 J/K mol. To convert ΔH to J/mol, we multiply by 1000, giving us ΔH = 144,000 J/mol.

To find the temperature at which the reaction becomes spontaneous, we set ΔG to zero, as this is the condition for equilibrium. Thus, we have 0 = ΔH - TΔS.

Rearranging the equation, we have TΔS = ΔH, and substituting the given values, we get T * 54 J/K mol = 144,000 J/mol.

Dividing both sides by 54 J/K mol, we find that T = 144,000 J/mol / 54 J/K mol = 2667 K.

Therefore, the reaction becomes spontaneous at approximately 2667 Kelvin.

For more question on reaction

https://brainly.com/question/25769000

#SPJ8

Compression happens when molecules are forced, or pressed, together. Rarefaction is just the opposite, it occurs when molecules are given extra space and allowed to expand.

In a longitudinal wave, the compression zone is where the particles are closest to one another. In a longitudinal wave, a rarefaction occurs where the particles are the furthest distant from one another.

Compression refers to the area where the medium is compressed, and rarefaction refers to the area where the medium is spread out.

Compression happens when molecules are forced, or pressed, together. Rarefaction is just the opposite, it occurs when molecules are given extra space and allowed to expand.

Learn more about compression, here:

https://brainly.com/question/1326823

#SPJ1

By using filtration, the sand and fine salt can be effectively separated based on their difference in particle size, providing a clean separation of the two components.

Filtration is a separation technique that takes advantage of the difference in particle size between sand and salt. It involves passing the mixture through a porous material, such as filter paper or a filter funnel, which allows the liquid (saltwater) and small salt particles to pass through while retaining the larger sand particles.

Here's how the filtration process can be carried out:

1. Set up a filter apparatus with a funnel and filter paper or a filter flask.

2. Place the mixture of sand and salt in a beaker or a flask.

3. Slowly pour the mixture into the filter paper or funnel, allowing the liquid (saltwater) to pass through while retaining the sand on the filter paper.

4. Once the liquid has passed through completely, the sand will be left behind on the filter paper or in the filter flask.

5. Carefully remove the sand from the filter paper or filter flask, and the saltwater solution can be collected separately.

For more such questions on filtration

https://brainly.com/question/29756050

#SPJ8

Answer:

Maybe A

Explanation:

The pH of the aqueous solution is 8 means solution is basic.

pH of any solution will be calculated by using the below equation:

pH = -log[H⁺]

Given that concentration of H⁺ ions = 1.0×10⁻⁸ M

On putting this value in the above equation, we get

pH = -log( 1.0×10⁻⁸ )

pH = -(0-8) = 8

Means the given aqueous soution is basic in nature.

Hence pH is 8 means solution is basic.

To know more about pH, visit the below link:

https://brainly.com/question/26424076

#SPJ2

Answer:

x/2

Explanation:

X = 2 molecules of H2

For 2 molecules of H2, there's only 1 molecule of O2. Meaning, there's twice the amount of H2, so O2 = x/2 molecules.

I hope I'm understanding this question right.

Answer: 13.5 minutes to run 3.2 km.

Explanation: To solve this problem, you need to convert the distance from kilometers to miles and the speed from miles per hour to kilometers per hour. 3.2 km is approximately 1.988 miles and 5.5 mph is approximately 8.851 kph. To find the time it takes to run 1.988 miles at 8.851 kph, you can use the formula time = distance ÷ speed. Plugging in the values, you get time = 1.988 miles ÷ 8.851 kph, which simplifies to approximately 0.225 hours or 13.5 minutes.

Therefore, it will take the student approximately 13.5 minutes to run 3.2 km.

a. The rate law for this reaction is: Rate = k[Cl] [H₂]. This means that the rate of the reaction is directly proportional to the concentrations of both Cl and H₂ molecules.

Rate law is an equation that describes the rate of a chemical reaction as a function of the concentrations of reactants. The rate law allows us to describe how the rate of a reaction changes when the concentrations of reactants are changed. It is derived from the rate equation, which is a mathematical expression that can be used to calculate the rate of a reaction from the concentrations of the reactants and the rate constant.

b. The rate law for this reaction is: Rate = k[O] [Os]. This means that the rate of the reaction is directly proportional to the concentrations of both O and Os molecules.
c. The rate law for this reaction is: Rate = k[NO₂]₂. This means that the rate of the reaction is directly proportional to the square of the concentration of NO₂ molecules.

To learn more about rate law
https://brainly.com/question/16981791
#SPJ1

Complete Question:

Answer:

If n = 4, then the possible values of 1 and m depend on the equation or expression being used. Without more information, it is impossible to determine what the possible values of 1 and m might be. Can you please provide more context or information about the problem you are trying to solve?

The total volume of the solution prepared by dissolving 48.0 grams of Ca(OH)₂ in enough water is 0.865 L

First, we shall obtain the mole of 48.0 grams of Ca(OH)₂. This is shown below:

Mole = mass / molar mass

Mole of Ca(OH)₂ = 48 / 74

Mole of Ca(OH)₂ = 0.649 mole

Finally, we shall obtain the total volume of the Ca(OH)₂ solution. Details below:

Volume = mole / molarity

Volume of solution = 0.649 / 0.750

Volume of solution = 0.865 L

Thus, we can conclude that the total volume of the solution is 0.865 L

Learn more about volume:

https://brainly.com/question/29144710

#SPJ1

Answer:

An atom is the smallest unit of matter that retains all of the chemical properties of an element. Atoms combine to form molecules, which then interact to form solids, gases, or liquids. For example, water is composed of hydrogen and oxygen atoms that have combined to form water molecules.

Explanation:

Answer:

Atom is the smallest particle in the universe. An atom is made up of sub-atomic particles. They are the protons (positively charged particle), electrons (negatively charged particles) and neutrons neutrally charged particles). The lightest atom ever known is Hydrogen atom. An atom is electrically neutral. When a atom looses or gains and electrons it is called an ions.