How many valence electrons are in an atom with the electron configuration in example A?

Example A: 1s22s22p63s23p64s24p2

22
2
4
6

The answer is:

Stage 2: High birth rates, decline in death rates, increased heath services but limited family planning options.

Stage 3: Low birth rates, low death rates, higher quality of health services and family planning options.

Stage 4: Lowest level of birth and death rates, population slightly declines, most advanced level of society.

This stages correspond to the Demographic Transition Model, which is based on historical population trends of 2 demographic characteristics (birth and death rates).

In Stage 2, the introduction of modern medicine decreases the death rate while, due to limited family planning options the birth rates remain high. Usually corresponds to the least developed countries.

In Stage 3 birth rate starts to decrease as there are better family planning options. Corresponds to more developed countries.

In Stage 4 the population stabilizes. It corresponds to most developed countries (strong economy, high level of education, good healthcare system.

Question:

Solution:

Remember that Natural selection is the process by which better-adapted organisms displace less-adapted ones through the slow accumulation of favorable genetic changes in the population over generations.

Now, according to the graph and the above information, in 2011, PCB-resistant fish greatly outnumbered fish with normal DNA. This suggests that the correct answer is:

Fish with PCB-resistant DNA survived to reproduce and pass on their genes in PCB-contaminated water, which increased its population.

So that, we can conclude that the correct answer is:

C.

iron and polar molecules

A buffeer is a solution that can resist pH of an acid or basic components.

Inquiry-based pedagogy involves fostering curiosity and active learning. For example, students investigating real-world environmental issues and proposing solutions.

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Photosynthesis and cellular respiration are two close related and complementary processes. Photosynthesis produces organic molecules and releases oxygen, which are used during cellular respiration to produce water, ATP, and CO₂.

Photosynthesis is a process plant cells go through when absorbing sunlight.

During photosynthesis, light energy and inorganic compounds are used to produce organic compounds -glucose- and release oxygen.

It occurs in chloroplasts and involves two stages: light-dependent and light-independent reactions.

• During light-dependent reactions, oxygen is released, while ATP and NADPH are produced. Both of them are used during light-independent reactions. It occurs in the thylakoid membrane in the electron transporter chain.

• The light-independent reaction occurs in the Calvin cycle in the stroma. During this stage, carbon from CO2 is fixated, and sugar molecules are synthesized

Cellular respiration is the process through which cells use organic compounds to produce energy.

Cellular respiration follows two ways, which depend on the presence or absence of oxygen, and both of them begin with the process of glycolysis, which occurs in the cytoplasm and does not need oxygen to occur.

1. Occurs in the presence of free oxygen.

2. Series of reactions by which pyruvic acid (product of glycolysis) turns into CO₂ and H₂O, producing many ATP molecules.

3. Respiration occurs in the mitochondria.

4. Takes place in two steps or stages: Krebs cycle and electron transporter chain.

5. Glycolysis and Krebs cycle produce electrons, which then travel along the electron transporter chain while releasing energy, and ATP is produced.

1. Occurs in the absence of free oxygen

2. Series of reactions by which using pyruvate (product of glycolysis) 2 ATP molecules van be produced.

3. There are two ways in which anaerobic respiration can be produced: lactic fermentation and alcoholic fermentation.

4. Lactic fermentation produces lactic acid and 2 ATP

5. Alcoholic fermentation occurs in two steps, and the final products are ethylic alcohol, 2ATP, and 2 CO₂

6. The whole anaerobic process occurs outside the mitochondria.

Photosynthesis is complementary to cellular respiration.

Table in the attached files

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Answer: (A) An error in a gamete cell that is involved in producing offspring is most likely to result in genetic variation among organism

Explanation:

Replication Error is also known as DNA replication error. It refers to the mistakes to inaccuracies that occur during the process of DNA replication. This can have various consequences, depending on their location and impact on gene function.

Gamete cells are responsible for the transmission of genetic information from one generation to another. Error in the replication of DNA in sperm or egg can lead to a change in genetic code which can eventually result in genetic variation among organisms.

All the other options given in the question are not a result of replication errors.

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Answer:

A. an error in a gamete cell that is involved in producing offspring

Explanation:

test approved

Answer:

Nucleotides are composed of three subunit molecules: a nucleobase, a five-carbon sugar (ribose or deoxyribose), and a phosphate group consisting of one to three phosphates.

(Source: https://en.wikipedia.org/wiki/Nucleotide)

In biology, autotrophs are organisms that can produce their own food using inorganic substances, such as sunlight and carbon dioxide.

Autotrophs  are also known as primary producers because they form the base of the food chain by converting energy from the environment into organic compounds.

The topic of autotrophs is typically covered in the study of plant biology in the context of a class 7 curriculum.

The most prevalent kind of autotrophs are plants. They do this through a process known as photosynthesis, which turns carbon dioxide, water, and sunlight into glucose (a sugar) and oxygen.

Chloroplasts, specialized organelles found in plant cells, are where this process occurs.

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The feature labeled 7 are parking meters which are located in urban areas.

Urban areas are highly inhabited areas that have a diversity of land uses and a high population density. High rates of economic activity, rapid population increase, and a variety of housing types are typical characteristics of these locations. Normal associations between urban regions and high levels of poverty, crime, and pollution exist. Typically, urban regions can be located in the centre of large cities, in the midst of them, or in their suburbs.

Public transit, such subways, buses, and trains, is frequently connected with urban areas. Numerous universities, hospitals, and other public services are located in urban regions. With their abundance of eateries, stores, and cafes, urban areas are frequently centres of culture, leisure, and relaxation. Due to greater expenses for resources like land, labour, and other resources, operating a business in an urban region is typically significantly more expensive than in a rural area.

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A .Because it reflects green light.

Explanation:

Chlorophyll gives plants their green color because it does not absorb the green wavelengths of white light. That particular light wavelength is reflected from the plant, so it appears green

Answer:

there are a number of types of asexual reproduction including fission, fragmentation, budding,vegetative reproduction, spore formation and agamogenesis.spore formations occurs in plants, and some algae and fungi, and will be disscused in additional concepts, binary fission in various single- celled organisms (left).

Explanation:

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13, 1781: British astronomer William Herschel discovers Uranus—the first new planet discovered since ancient times - while searching for faint stars. 1787-1851: Four Uranian moons are discovered and named Titania, Oberon, Ariel and Umbriel. 1948: Another moon, Miranda, is discovered. Mar.

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The absence of flooding from rivers into forested floodplain wetlands would lead to adverse effects on soils, hydrology, and the overall biodiversity downstream, emphasizing the importance of maintaining the natural connection between rivers and floodplains for the health and functioning of these ecosystems.

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Answer:

1.) The solute molecules will not move between the two sides because the membrane does not have large enough spaces for the molecules to move through. The water molecules will move to the right side because water moves to places of a higher solute concentration.

2.) The right side represents high concentration because it contains the majority of the solute molecules.

3.) The left side represents low concentration because it contains a small amount of solute molecules compared to the right side.

The introduction of an apex predator, such as a killer whale to an ecosystem can have significant impacts on the existing food web and ecosystem dynamics.

Thus, the presence of a new apex predator, such as a killer whale increases the competition between the existing apex predator and the newly introduced predator for food resources, such as seals and sea lions.

The introduction of a new apex predator can also affect the behavior of the existing species. For example, the seals can change their behavior to protect themselves from predation by the killer whale by changing their movement patterns.

The introduction of a new apex predator like a killer whale to this ecosystem require careful monitoring and management to minimize the negative impacts on the ecosystem.

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I am the silent thief, consuming life's essence,

A symbol of chaos, I breed in the dark,

Cells divide uncontrollably, my mark,

Cancer, the destroyer, a ruthless presence in disguise.

In the body I connect, strong and true,

Supporting movements, aiding you,

Flexible yet firm, holding tight,

Ligament, the guardian, in shadows out of sight.

Brittle bones crumble, a silent decay,

Weakening structure, as time slips away,

Fragility reigns, a fortress breached,

Osteoporosis, the thief, silently reached.

Softness pervades, my presence felt,

Bones malformed, as strength slowly melts,

Whispers of pain with each step I tread,

Osteomalacia, the ghost, lingering with dread.

In stature I falter, a different form,

A genetic tale, an anomaly born,

Limbs limited, yet spirits strong,

Achondroplasia, the challenge, that shapes me lifelong.

Inflammation festers, a battle unseen,

Bone becomes battlefield, engulfed in routine,

Infection's grip tightens, as warriors engage,

Osteomyelitis, the warzone, with each passing age.

From the depths I emerge, a dark, vile spawn,

Tumor invades bone, a menace withdrawn,

Cells rebel, multiply, taking hold,

Osteogenic sarcoma, the demon, fierce and bold.

1. Cancer:

I am the silent thief, consuming life's essence,

A symbol of chaos, I breed in the dark,

Cells divide uncontrollably, my mark,

What am I?

2. Ligament:

In the body I connect, strong and true,

Supporting movements, aiding you,

Flexible yet firm, holding tight,

Who am I?

3. Osteoporosis:

Brittle bones crumble, a silent decay,

Weakening structure, as time slips away,

Fragility reigns, a fortress breached,

What am I?

4. Osteomalacia:

Softness pervades, my presence felt,

Bones malformed, as strength slowly melts,

Whispers of pain with each step I tread,

Who am I?

5. Achondroplasia:

In stature I falter, a different form,

A genetic tale, an anomaly born,

Limbs limited, yet spirits strong,

What am I?

6. Osteomyelitis:

Inflammation festers, a battle unseen,

Bone becomes battlefield, engulfed in routine,

Infection's grip tightens, as warriors engage,

What am I?

7. Osteogenic Sarcoma:

From the depths I emerge, a dark, vile spawn,

Tumor invades bone, a menace withdrawn,

Cells rebel, multiply, taking hold,

What am I?

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Answer:

Methionine - Serine - Methionine - Serine - Lysine - Aspartic acid - Arginine - Lysine - Aspartic acid - Lysine - Serine - Methionine - Lysine - STOP.

Explanation:

The task in this question, which is to use the codons in the mRNA sequence to draft out an amino acid sequence depicts the process of TRANSLATION. Translation is the process by which an amino acid sequence is synthesized using the codons in the sequence of a mRNA molecule. The mRNA sequence is as follows:

sequence for the mRNA: AUG-UCA-AUG-UCA-AAA-GAC-CGA-AAA-GAC-CGA-UCA-AUG-AAA-UGA

Using the genetic code (a table showing the proteins encoded by certain codons), the following amino acid sequence is encoded by the mRNA sequence above:

Methionine - Serine - Methionine - Serine - Lysine - Aspartic acid - Arginine - Lysine - Aspartic acid - Lysine - Serine - Methionine - Lysine - STOP.

Answer:

The largest endocrine gland (s) that makes 3 hormones that affect the metabolism is the: thyroid gland.

The largest endocrine gland that makes three hormones that affect metabolism is the Pancreas. Thus, the correct option for this question is C.

An endocrine gland may be defined as a type of gland which consists of several organs that make hormones and release them directly into the blood so they can travel to tissues and organs all over the body. These hormones control many important functions in the body, including growth and development, metabolism, and reproduction.

The pancreas is the largest endocrine gland that significantly makes three hormones namely, Insulin, Glucagon, and Somatostatin. These hormones are actively involved in the regulation of metabolism by numerous mechanisms.

For example, insulin lowers the level of sugar in the blood, while glucagon increases the level of sugar by transforming its storage form.

Therefore, the largest endocrine gland that makes three hormones that affect metabolism is the Pancreas. Thus, the correct option for this question is C.

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The way, in which the scientist's claim can be best evaluated using scientific argumentation is the scientist could repeat the experiment until a popular result is obtained. The correct option is D.

A scientific argument is a technique used by researchers to direct their work.

Scientists point out flaws and limitations in other people's arguments in order to ultimately improve scientific explanations and experimental designs. This technique is known as evidence-based arguments.

The scientist's claim can be best assessed using scientific argumentation if the experiment is repeated until a popular outcome is achieved.

Thus, the correct option is D.

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Answer:

I made a photo of all the beneficial ones and the harmful ones are not highlighted green.

Explanation:

A step in designing an experimental investigation is identifying the variables that will be controlled for all experimental groups.

The correct option to the given question is option A.

An experiment is a controlled investigation where scientists manipulate and measure specific variables. Scientists design experiments to test hypotheses and answer questions. In the design of an experiment, several steps must be followed to ensure the results are accurate and reliable.

Identifying the variables that will be controlled for all experimental groups: This is an essential step in designing an experimental investigation. Controlled variables are variables that scientists keep constant throughout the experiment so that they do not influence the dependent variable.Writing a procedure that prevents other scientists from repeating the results: Scientists usually provide a detailed description of their experimental procedures to ensure that other scientists can reproduce the results of the experiment and verify its accuracy.

Making sure that the hypothesis will be supported and not refuted: A hypothesis is a statement that scientists make that explains the relationship between the variables in an experiment. The hypothesis must be tested to determine whether it is supported or refuted.Collecting each piece of data in a different way so that there is more variety: In an experiment, data is collected to support or refute the hypothesis. Scientists should collect data in different ways to ensure that the results are reliable and accurate.

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Answer:

True

Explanation:

i took the test and it was right

Answer:

to retain moisture and hold the soil in place.

Explanation:

this technology of putting dead plants on the soil under the plants and the area nearing the plants is called mulching.it is helpful in reducing the rate of evaporation and also reduces soil erosion.

Conservation plowing is achieved to minimise soil erosion. Thus, option C is correct.

Soil erosion is the deterioration of the topmost layer of soil. The top fertile layer of the soil withers leaving the soil infertile.

It is a gradual naturally occurring phenomenon but can be accelerated with human interventions.

There are many factors responsible for soil erosion:

• Deforestation

• Excessive grazing

• Mining

• Construction work

• Drought and floods

Soil erosion negatively affects the crop yield and also clogs the water bodies. This is therefore harmful for the aquatic species. Dry and barren soil is more prone to floods.

Soil erosion should be minimized as it produces a negative impact on the ecosystem.

Soil erosion can be prevented by planting more number of trees. The roots of the trees help in holding the soil in its place.

Therefore, soil erosion should be checked to preserve the soil fertility.

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Answer:

C [Krebs cycle]

B [glycolysis]

Answer: 206 bones

Explanation: