pls answer soon 8th grade science

Answer:

Earth has experienced cold periods (or “ice ages”) and warm periods (“interglacials”) on roughly 100,000-year cycles for at least the last 1 million years.

Explanation:

The removal of a keystone species from a community usually results in substantial changes in the abundance of many species.

The removal of a keystone species from a community usually results in substantial changes in the abundance of many species. The keystone species play an important role in a community's biodiversity, and their removal can have cascading effects throughout the ecosystem. Keystone species can be considered as a crucial element in the ecosystem, and the removal of a keystone species will have a great impact on the other members of the community. Therefore, when a keystone species is removed from a community, the disappearance of that community is unlikely, but there will be significant changes in the abundance of many species. The removal of a keystone species can have both positive and negative impacts, and it's important to understand the ecological role that keystone species play in their respective ecosystems. For example, in a coral reef ecosystem, the removal of a keystone species such as parrotfish can result in the overgrowth of algae, which can harm the reef's overall health. Keystone species have a significant role in maintaining the structure of ecosystems. They have a disproportionate impact on their ecosystem compared to their numbers. When removed, their absence can have a massive impact on their ecosystem. They may cause the decline or even collapse of their ecosystem, leading to severe effects on biodiversity.Their disappearance can cause changes in the abundance of many species. The impact on other species is profound and can cause extinction cascades, resulting in a decline in species richness and ecosystem functioning. In some cases, the loss of keystone species can even be irreversible. They play a crucial role in many ecosystem processes such as nutrient cycling and seed dispersal, and the loss of these species can cause these processes to change or stop altogether.Therefore, it is crucial to understand the importance of keystone species and their role in the ecosystem. By understanding the role of keystone species, ecologists can design management plans that aim to protect keystone species and their habitats. This helps to maintain the ecosystem's biodiversity and ensure that ecosystem services are provided for future generations.

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Yes, a transformed organism can pass on its new traits to its offspring. Transformation is the alteration of the genetic material of an organism by artificial means. It can occur naturally by the process of genetic recombination.

Recombination occurs when genetic material is exchanged between two different DNA molecules to produce new combinations of genes. Transformations can be passed on to the next generation of an organism. The new traits introduced in an organism by transformation can be transferred to its offspring. This is the reason why genetic engineering is considered an important tool in biotechnology to modify the genes of organisms. This can be done through a variety of techniques, such as gene insertion, gene deletion, or gene modification. In some cases, the new traits that are introduced into the organism can be passed on to its offspring.

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Answer:

C. both A and B

Explanation:

The structural formulas of amino acids are the same except for the side chain or R group, which differentiates one amino acid from another.

Answer choice B is correct. The structural formulas of amino acids consist of a central carbon atom, known as the alpha carbon, which is bonded to four different groups: an amino group (NH2), a carboxyl group (COOH), a hydrogen atom (H), and the side chain or R group.

The side chain varies among different amino acids, giving each amino acid its unique properties and chemical characteristics.

The amino and carboxyl groups are present in all amino acids, while the hydrogen atom and alpha carbon are also consistent components. Therefore, the side chain or R group is the distinguishing factor that sets one amino acid apart from another.

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Answer:

They include: mutations in transcription factors and signalling proteins; mutations in factors that regulate the methylation of DNA and associated histone proteins; mutations in the protein complex cohesin, which regulates chromatin structure; and mutations in proteins involved in splicing

Explanation:

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the global sea level is rising and ocean temperatures are Increasing

Answer:

because it takes longer to process so it would stay longer so it's more dangerous

The periodic table divides elements according to similar properties-- example, metals and nonmetals.

The relationship between metals and nonmetals is explained below:1. Four properties that are common with metals and nonmetals:Metals1. Metallic elements have a shiny luster.2. Most metals are solid at room temperature.3. They have a high melting and boiling point.4. Metals have a high electrical conductivity.Non-Metals1. Most non-metals have no luster and are dull.2. Nonmetals can be in any state at room temperature: solid, liquid, or gas.3. Nonmetals have a low melting and boiling point.4. Nonmetals have low electrical conductivity.2. What happens to individual element properties of both metals and nonmetals when they bond together forming a mineral?

In a mineral, when individual element properties of both metals and nonmetals bond together, they result in a variety of new properties that depend on the type and proportion of elements involved in the mineral formation.

For example, the properties of both sodium (a metal) and chlorine (a nonmetal) alter when they bond together to form sodium chloride. Sodium chloride (NaCl) is white, tastes salty, is brittle, and is an excellent conductor of electricity. The individual properties of sodium and chlorine have merged into new properties in NaCl.

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Answer: genes and chromosomes

Explanation:

Answer:

Humans use up many nonrenewable reacources every day, alongside renewable ones. One example of such is oil, oil takes millions of years to form, much longer than the amount of time it takes for us to use it up.

Explanation:

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Answer:

As the lips vibrate, the sound is transmitted via the whale's 'melon' – fatty tissue that makes up its forehead. This tissue has the same acoustic properties as water. ... Toothed whales can direct sound by bouncing it off air sacs in their nose and possibly by using face muscles to alter the shape of the melon.

Explanation:

Answer:

sexual reproduction

Explanation:

Answer:

Fruit, the fleshy or dry ripened ovary of a flowering plant, enclosing the seed or seeds

Explanation:

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The effect that is least likely to be a result of deforestation is an increase in biodiversity. That is option B.

Deforestation is a practice that encourages the clearing of forests for other purposes such as agricultural croplands, urbanization, or mining activities.

This practice needs to be avoided because:

But deforestation leads to a decrease in biodiversity instead of an increase.

Deforestation can lead to biodiversity loss. This occurs when animal species that live in the trees no longer have their habitat, cannot relocate, and therefore become extinct.

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Answer:

D

Explanation:

Plants take their nitrogen from the soil which would have been converted by bacteria ...not straight from the atmosphere

Answer:

substitution, missense mutation, and transition

Explanation:

A mutation is any change in the genetic information of an organism. A substitution is a point mutation by which a single nucleotide base pair is replaced by a different nucleotide. Moreover, a missense mutation is a point mutation that results in the incorporation of a different amino acid in the polypeptide chain since this mutation generates a new codon which codes for a different amino acid. Finally, a transition is a point mutation where a purine (either Adenine or Guanine) is changed to another purine, or a pyrimidine (either Thymine or Cytosine) is changed to another pyrimidine (in this case, Cytosine is changed to Thymine).

Answer:

The photosynthesis chemical equation states that the reactants (carbon dioxide, water and sunlight), yield two products, glucose and oxygen gas.

Answer:Photosynthesis requires sunlight, carbon dioxide, and water as starting reactants .

Explanation:

After the process is complete, photosynthesis releases oxygen and produces carbohydrate molecules

QUESTION :::::

Which gas is most necessary for plants to do photosynthesis?

A. carbon dioxide

B. nitrogen

C. oxygen

ANSWER ::::

carbon dioxide

To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight. for photosynthesis. Carbon dioxide enters through tiny holes in a plant's leaves, flowers, branches, stems, and roots. Plants also require water to make their food.

Explanation:

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Factors that will not affect the influence of an aquatic system's biological oxygen demand are the blockage of wavelengths of light that are essential to photoautotrophs. Therefore, option " E". The amount of oxygen that is required for aerobic bacteria to decompose organic waste from water is measured as BOD.

The factors which influence the biological oxygen demand depend on the kind and amount of natural material present, the temperature, the pH, oxygen fixation, and furthermore the presence of microorganisms. These factors directly influence aquatic life.

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In chromosomal mutations, changes occur in the structure or arrangement of chromosomes.

Let's go through each given set of chromosomes and their corresponding chromosomal mutations:

In summary, the given chromosome sets exhibit different types of chromosomal mutations, including paracentric inversion, tandem duplication, displaced duplication, and pericentric inversion. However, the last set (АEDC.BFG) does not specify a specific type of chromosomal mutation.

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Saltatory conduction is aided by sodium and potassium channels located at the nodes of Ranvier.

Nodes of Ranvier are small gaps or spaces between the myelin sheaths along the axons of neurons. These nodes are rich in ion channels, including sodium and potassium channels. These ion channels play a crucial role in facilitating saltatory conduction.

When a nerve impulse reaches a node of Ranvier, the depolarization of the membrane opens voltage-gated sodium channels, allowing sodium ions to rush into the axon. This influx of sodium ions generates an action potential that rapidly propagates down the axon. As the action potential reaches the next node of Ranvier, the process repeats, allowing the impulse to "jump" from one node to the next.

The nodes of Ranvier are important because they are the only points along the myelinated axon where the ion channels are densely concentrated. This concentration of ion channels enables the efficient and rapid propagation of the nerve impulse through saltatory conduction.

It is worth noting that while glial cells (specifically, oligodendrocytes in the central nervous system and Schwann cells in the peripheral nervous system) are responsible for producing the myelin sheaths that aid saltatory conduction, they are not directly involved in the conduction process itself. Instead, they provide insulation and support to the axon, allowing for more efficient signal transmission.

Therefore, the correct answer is sodium and potassium channels, nodes of Ranvier.

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Answer: 8 bacteria would be present after four hours.

Explanation:

A student researcher might look at the various symptoms in the surroundings while examining bacterial patches that kill safe relatives.

Denial zones, which are areas devoid of development or colonies of protected relatives, will be the most prominent feature. This region will display the effects of bacteria, whether by direct bacterial killing or growth suppression. The bacterial patches themselves, however, will show clear growth and colonization.

There would be a progressive decline in bacterial concentration as researchers moved away from the patch, which would lead to a decrease in colony density. The regular growth patterns of other creatures or microbes would be unaffected by the patch. Additionally, the absence or low presence of protected relatives around bacterial patches can have ecological effects, which can alter community dynamics.

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To identify a sex-linked recessive lethal mutation using a balancer chromosome such as cncyo in Drosophila, lines with mutations can be identified in the F1 generation.

A balancer chromosome is a specialized chromosome used in Drosophila genetics to maintain the integrity of a specific genotype during breeding.

In the case of a sex-linked recessive lethal mutation, the balancer chromosome contains multiple inversions that prevent recombination and help maintain the recessive lethal mutation along with visible markers.

The cncyo balancer chromosome, for example, carries the cn mutation, which is recessive and lethal when homozygous.

When performing crosses with a balancer chromosome, the F1 generation will inherit one copy of the balancer chromosome along with the recessive lethal mutation.

The visible markers on the balancer chromosome, such as eye color or wing shape, can be used to identify the presence of the balancer chromosome and, by extension, the presence of the recessive lethal mutation.

If a line exhibits the phenotypic markers associated with the balancer chromosome, it indicates the presence of the recessive lethal mutation.

Therefore, lines with mutations can be identified in the F1 generation when testing for a sex-linked recessive lethal mutation using a balancer chromosome in Drosophila.

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Explanation:

The binucleate pollen grain results from the microspore mitosis leading to formation of a generative cell and a vegetative (or « pollen tube ») cell, both included within the pollen cell wall; the generative nucleus divides to form the two sperm nuclei in the pollen tube.