a chemical substance that organisms require to live is what

It is necessary for cells to have nucleus acids in their nucleus because they carry the genetic blueprint of a cell and carry instructions for the functioning of the cell.

A nucleic acid is a chain of nucleotides that biological systems use to store genetic information. It produces the DNA and RNA molecules, which hold the data necessary for cells to produce proteins.

A "polymer" of "nucleotides," or a long molecule made up of them, is referred to as nucleic acid. All life on Earth needs nucleic acids to store genetic information; in other words, nucleic acids serve as the "source code" or fundamental blueprint for the creation of cells.

Your genetic information, which you acquired from your parents, is stored and transmitted by nucleic acids. Genes are unique pieces of nucleic acids that are in charge of creating every protein in your body. 

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In comparison of the cones and rods of a human eye, rods are B: mainly found on the periphery of the retina.

The human retina has two kinds of photoreceptors to gather light namely cones and  rods.  Rods are specialized cells in the retina of the eye that are responsible for vision at low light levels, also called scotopic vision. They are more sensitive to light than the other type of cell in the retina, called cones, which are responsible for color vision and visual acuity at higher light levels, also called photopic vision.

So in comparison to both rods and cons in human eye, rods are mainly found on the periphery of the retina.

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The example that includes only chemical changes that occur in the digestive process is the reaction of saliva, stomach acid, bile, and pancreatic juices with food. Option D.

Chemical changes refer to changes to the chemical properties of substances. In biological reactions, these substances are referred to as reactants.

Chemical changes are different from physical changes. In physical changes, only the physical properties of substances are altered while their chemical properties remain intact.

When a substance changes chemically, its physical properties most often change along. However, this is not in all cases.

Thus, looking at the examples given, their classification into either physical or chemical changes is as follows:

When saliva, stomach acid, bile, and pancreatic juices react with food, the chemical properties of food change because the enzymes convert different components of food from one form to another as part of the process of digestion.

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Answer:

gas

Explanation:

Answer:

Explanation:

The place in the body where the heart lies is called the chest or thorax. More specifically, the heart is located in the mediastinum, which is the central compartment of the thoracic cavity between the lungs.

Answer:

Explanation:hv

Itching and other skin problems are signs that a cat or dog may have flea. Fleas are parasites known for their biting and blood-sucking abilities. When they bite, flea saliva enters the pet’s circulatory system, sometimes causing an allergic response commonly seen as a “hot spot” on the pet’s neck or the base of its tail.

Fleas are tiny parasitic insects that infest the fur of dogs and cats. They feed on blood and cause skin irritation that results in itching. If the problem is severe, it can lead to more significant health issues. Pet owners should watch for signs of fleas and treat their pets promptly to avoid complications. Fleas lay eggs on the skin of dogs and cats, which hatch and develop into larvae.

The larvae feed on the skin, shedding as they mature. Adult fleas emerge from the larvae, biting the host to feed on blood. The process repeats itself, with adult fleas continuing to lay eggs on the skin of the pet.The most common sign of fleas in dogs and cats is itching. Pets will often scratch themselves, bite their skin, or lick excessively to relieve the irritation.

Other signs of fleas include red or inflamed skin, hair loss, and the appearance of small, raised bumps on the skin. These bumps are often referred to as "flea dirt" and are the waste products of the fleas. In severe cases, anemia, an allergic reaction, or the transmission of other parasites or diseases can occur.

Flea infestations can be treated with a variety of products, including topical treatments, shampoos, and collars. It is essential to follow the instructions on the product label and treat the pet and the surrounding environment to eliminate the fleas. Prevention is key to avoiding flea infestations, so pet owners should maintain a regular grooming and flea prevention schedule.

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Answer:

1) Weathering, Erosion, Disposition

2) Physical weathering is the breakdown of large rocks into fragments by physical forces; the chemical composition of the rock is not changed. Chemical weathering is the breakdown of rock by chemical reactions; the chemical composition is changed.

3) The four forces of erosion are water, wind, gravity, and glaciers.

4) Because the velocity of the river slows down a great deal when it reaches the large body of water, the sediment that the river was carrying is deposited along the mouth of the large body of water.

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Abrasion: Abrasion is the breaking down and wearing away of rock material by the mechanical action of another rock. Three agents of physical weathering that cause abrasion are moving water, wind, and gravity. Also, rocks suspended in thence of a glacier can cause abrasion of other rocks on Earth's surface. This would be a prime example of physical weathering, or mechanical weathering.

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Acid Precipitation: Acid rain causes less erosion than normal rainwater does. Rainwater can break down rocks by dissolving minerals in the rocks. Acid rain is rainwater that is more acidic than normal rainwater. Acid rain can also dissolve the minerals in rocks faster than normal rainwater can. This is chemical weathering.

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Animal actions: Animal and plant mobility is a factor in biological weathering. For instance, a plant may grow in a gap in a rock and, as its roots spread, cause the fracture to expand. A rabbit may also burrow into a crack in a rock, making it wider and eventually separating the rock. This is an example of physical weathering.

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Ice wedging: Ice wedging ,sometimes known as frost wedging ,can also cause rocks to break apart. Ice wedging causes cracks in rocks to expand as water seeps in and the water freezes and expands opening the crack further. Rocks formed under pressure deep within earth can become exposed at the surface. This is physical weathering

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Oxidation: Oxidation is another kind of chemical weathering. It occurs when oxygen from air dissolves in water and combines with chemicals in the rocks to form oxides. if the rock contains a lot of iron, then oxidation produces a brown material called iron oxide. This looks like rust on the rock.

Weathering is the chemical and mechanical breakdown of exposed rock. The chemical changes alter the minerals and make them softer, and mechanical weathering physically breaks rock into smaller and smaller pieces.

Erosion is the REMOVAL of those chemically and mechanically softer and broken pieces of rock from their original locations, by gravity, water, ice or wind. Erosion is transport (and as a result, fresh unaltered rock is exposed to wind, water and weather, and THAT becomes weathered in turn). The material being transported is ‘sediment’: sand, silt, mud and gravel.

Deposition is when the weathered and eroded (transported) material is dropped and settles down elsewhere, forming a ‘deposit’ of transported rock material.

If this deposit remains undisturbed long enough, and is buried by enough arriving material, it will eventually go through compaction and chemical reactions forming cement between the grains - thus resulting in a brand new, sedimentary rock.

Weathering, erosion, transport, deposition, compaction and cementation are part of the ‘rock cycle’.

Let’s start with basalt that form at mid ocean spreading centers. At mid ocean spreading centers rock material from the earth’s mantle continuously melts due to continuous decreasing in pressure from the oceanic crust spreading at this point. The molten rock quickly cools at the earth’s surface and forms rock known as basalt that makes up the oceanic crust all over the world. The newly produced oceanic crust rock slowly moves towards a boundary with a continental crust where the oceanic crust subducts beneath the continental crust due to the oceanic crust having a higher density than the continental crust. This is where things get a bit more interesting.

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Answer: Positive:

1. Keep humans alive

2. Adequate food

Negative:

1. pollution

2. over population

Explanation:

Answer:

it's a primary consumer

Explanation:

a food source for animals know as the primary consumer.

The correct answer is A. Data on changes in the population of other aquatic species and abiotic factors after the appearance of the Asian carp. Invasive species can change ecosystem function. To prove it, it is needed to record data on population abundance of native species, and abiotic parameters related to the invasive species. If there is a change in both issues after the introduction of the invasive species, we could say it is changing the ecosystem functioning.

Among the choices given, there are two that plays important role in memory formation and consolidation/association. These are the hippocampus and amygdala. Hippocampus is the part of the brain located in the inner region of the temporal lobe while the amygdala is located near the hippocampus and in the medial temporal lobe. The roles/functions of the hippocampus are the formation of new memories, consolidating the long-term and short-term memory, and retention of memory. The roles/functions of the amygdala are consolidating and enhancing memories related to emotions, strengthening the emotional events, and recalling details of events with heightened emotions.

ANSWER:

The part of the brain responsible for long-term memory, storage, and recall is (B) Hippocampus.

The addition of hydrogen peroxide in the cell breaks down the enzymes and causes cell death. The fact that hydrogen peroxide (H2O2) is stable in abiotic environments at room temperature and has a neutral pH makes it stand out from other general toxins. However, it kills cells quickly by producing highly reactive hydroxyl radicals.

Hydrogen peroxide is a byproduct of metabolism that can cause harmful effects. It can fall to pieces to yield hydroxyl extremists that assault significant biochemicals like proteins and DNA. It is also used for catalase tests in bacterial cultures.

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The balance used to measure the mass of the rock reads it in three different lines. The first one is related to the first digits, meeaning that the first one will be 3. As it is in a hundred scale, we add the second line, which shows the number 50. At the end, the third line will be added too, showing us the number 4,6. To fully measure, we add the three values, as follows: 300 + 50 + 4,6 = 354,6. Therefore, the correct answer is d) 354,6g.

There are five postulates proposed by Darwin to explain the mechanism of natural selection.

- Individuals are variable (therefore, D is incorrect)

- More offspring is produced than can survive (so C is incorrect as well)

- The history of Earth is long

- Some variations are passed down (meaning that B is also wrong)

- Survival and reproduction are not random (so E is incorrect too).

The genetic drift is part of the theory of evolution proposed by Sewall Wright, not by Darwin. Therefore, the correct answer is A. Small populations can lead to genetic drift.

Answer:

Genes are segments of deoxyribonucleic acid (DNA) that contain the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person's genes. Genes are contained in chromosomes, which are in the cell nucleus.

Explanation:

Genes are segments of DNA that contain the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person's genes. Genes are contained in chromosomes, which are in the cell nucleus.

Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA). Passed from parents to offspring, DNA contains the specific instructions that make each type of living creature unique.

The term chromosome comes from the Greek words for colour (chroma) and body (soma). Scientists gave this name to chromosomes because they are cell structures, or bodies, that are strongly stained by some colourful dyes used in research. The unique structure of chromosomes keeps DNA tightly wrapped around spool-like proteins, called histones.

Without such packaging, DNA molecules would be too long to fit inside cells.

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Answer:

The microsatellite method is a technique used in genetics to study and analyze genetic variations in an individual's DNA. It involves examining microsatellites, which are short, repetitive DNA sequences scattered throughout a person's genome. Scientists use specific primers to amplify these sections of DNA and then analyze the number and frequency of repeats in each sample.

Microsatellite analysis can be used to determine the genetic relatedness of individuals or populations, to identify genetic disorders and mutations, and to trace patterns of migration and ancestry. It can also be used in forensic investigations to match DNA samples from crime scenes with suspects.

The results of microsatellite analysis are typically presented in the form of a genetic profile, which shows the number and type of repeats at each microsatellite locus. This data can be visualized as a chart or graph, which can help researchers visualize patterns of genetic variation and compare them between different individuals or populations.

Explanation:

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Answer:

7 neutral

Explanation:

it is because water is something that has no taste and it's expands because of the pressure that it's feeling

Answer:

The process of phosphorylating ADP to form ATP and removing a phosphate from ATP to form ADP in order to store and release energy respectively is known as the ATP cycle.

Explanation:i hope this is the answer

Explanation:

Soil formation is influenced by organisms (such as plants), micro-organisms (such as bacteria or fungi), burrowing insects, animals and humans.

As soil forms, plants begin to grow in it. The plants mature, die and new ones take their place. Their leaves and roots are added to the soil. Animals eat plants and their wastes and eventually their bodies are added to the soil.

This begins to change the soil. Bacteria, fungi, worms and other burrowers break down plant litter and animal wastes and remains, to eventually become organic matter.

order of the events of visual signal transduction  1. conversion of cis-retinal to trans-retinal 2. bleaching of photopigment 3. conversion of trans-retinal to cis-retinal 4. resynthesis of a photopigment

A virus moves its genetic material from one bacteria to another through a process called transduction. Bacteriophages are viruses that may infect bacterial cells and utilise them as hosts to produce additional viruses. DNA is transmitted from one bacteria to another by a virus through a process known as transduction. The technique of introducing foreign DNA into a different cell via a viral vector is sometimes referred to as this. The two forms of transduction are specialised and generic. The phage can transport any portion of the DNA during generalised transduction. While in specialised, the phage only carries the designated portion of DNA.

arrange in order the events of visual signal transduction following the cis-retinal absorption of light. 1. conversion of cis-retinal to trans-retinal 2. bleaching of photopigment 3. conversion of trans-retinal to cis-retinal 4. resynthesis of a photopigment?

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Answer:

If the net force acting on an object is zero, the object must be stationary. True False Question 4 0/1 pts Inertia and Mass are related True False The net force acting on an object is the same as the vector sum of all of the external forces that act on the object.

Answer:

Explanation:

Another example of positive reinforcement would be getting paid after going to work. Getting that paycheck at the end of the week or seeing your direct deposit go through increases the likelihood that you will go back to work on Monday. The money is added to your environment, i.e., your bank account.

Answer:

its C just did the test pennfoster :)

Answer:

In many countries, the government is organized into different levels of authority, including national, provincial/state, and local/municipal governments. Each level of government has a unique set of responsibilities and powers that are designed to address the needs and interests of civil society.

National governments are responsible for setting policies and laws that affect the entire country. They are typically responsible for issues such as national security, foreign policy, economic regulation, and social welfare programs. National governments have the power to tax citizens and businesses, regulate trade and commerce, and provide funding for important public services such as education, healthcare, and infrastructure.

Provincial or state governments are responsible for implementing policies and laws that affect their respective regions. They typically have the power to regulate local industries, provide funding for regional infrastructure projects, and manage social welfare programs. Provincial or state governments also have the power to levy taxes on citizens and businesses within their jurisdiction.

Local or municipal governments are responsible for providing essential services to their communities. They typically have the power to regulate local businesses, provide funding for local infrastructure projects such as roads and bridges, and manage social welfare programs at a community level. Local or municipal governments also have the power to levy taxes on citizens and businesses within their jurisdiction.

Each level of government plays an important role in addressing the interests of civil society. National governments are responsible for creating policies that affect the entire country, while provincial or state governments focus on regional issues. Local or municipal governments are responsible for addressing the needs of individual communities. By working together, these different levels of government can ensure that civil society is well-served and that the needs of all citizens are met.

Explanation:

The statements that accurately describe the impacts of the mutations shown based on the illustrations are: Mutation 1 is a silent mutation, Mutation 2 results in a frameshift mutation and Mutation 4 results in a premature stop codon.

Options A, B & D are correct.

A silent mutation is a change in the DNA sequence that does not change the amino acid sequence of the resulting protein. In this case, mutation 1 is a substitution of a single nucleotide, but it still results in the same amino acid (leucine), so it is a silent mutation. Therefore, statement A is true.

A frameshift mutation is a type of mutation that results in the alteration of the reading frame of the codons in the mRNA sequence, which can lead to a completely different amino acid sequence downstream from the mutation site. In this case, mutation 2 is an insertion of a single nucleotide, which causes a frameshift mutation that changes the amino acid sequence downstream from the mutation site. Therefore, statement B is true.

A missense mutation is a change in the DNA sequence that results in a different amino acid being incorporated into the protein. In this case, mutation 3 is a substitution of a single nucleotide that changes the amino acid from leucine to proline. Therefore, statement C is true.

A premature stop codon is a type of mutation that results in the truncation of the protein sequence, usually leading to a non-functional protein. In this case, mutation 4 is an insertion of a single nucleotide that creates a premature stop codon, resulting in a truncated protein. Therefore, statement D is true.

Therefore, the correct answer choices are A, B, and D.

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The question is incomplete. the complete question is:

Five strands of mRNA are depicted here, numbered 1-5. The mRNA sequence labeled number 1 indicates the codons that result from the transcription of the original, unmutated DNA. Identify the statements below that accurately describe the impacts of the mutations shown based on the illustrations. Select the three (3) answer choices that apply.

A. Mutation 1 is a silent mutation.

B. Mutation 2 results in a frameshift mutation.

C. Mutation 3 is a missense mutation.

D. Mutation 4 results in a premature stop codon.

Answer:

cell,tissue,organism,organ and then organ system

Explanation:

i also did this in bio

1. cell

2. tissue

3. organ

4. organ system

5. organism

bc i say so