URGENT PLZ ANSWER ASAP
In order for Tiktaalik to be considered a transitional fossil, when does it need to have appeared in the fossil record?


a) after amphibians

b) between fish and amphibians

c) before fish

d) at the same time as amphibians

e) before fish and amphibians


PLZ ANSWER URGENT ASAP

Amino acid building blocks make up proteins. Thus, the right response to the question is (c).

A complex collection of molecules known as a ribosome is used by cells to assemble proteins. The ribosome puts amino acids in the correct order and connects them with peptide bonds. A polypeptide chain—a lengthy collection of amino acids—is produced by this procedure, known as translation.

Amino acids make up the chemical substances known as proteins. Up to four levels of structure can be found in proteins. Different proteins each have a complicated structure that gives them special characteristics. Proteins called enzymes speed up biological processes in cells. Proteins known as antibodies hunt down and kill infections.

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Cross between AB parent with O parent.

There will be two genotypes possible for the offspring: AO and BO. The offspring will either manifest blood type A or blood type B.

Fragmentation is a form of asexual reproduction and is seen in annelids, fungi, cyanobacteria, sponges, and flatworms.

In Fragmentation, an organism divides itself into a number of fragments. It occurs when an organism completely breaks down independently irrespective of the other parts. Each one of these fragments matures into fully grown adults that are clones of the original organism.

Asexual reproduction usually involves the participation of a single parent alone can produce new offspring. The newly produced individual is genetically identical to one another and its parent. Both multicellular and unicellular organisms divide by fragmentation which is asexual reproduction.

Fragmentation is the most common method of reproduction in lower invertebrates. It is seen in many organisms including filamentous cyanobacteria, algae, lichens, molds, many plants, and animals such as flatworms,  annelid worms, sponges, and sea stars.

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The organisms that can reproduce by fragmentation are Option d Sponges and Sea anemones.

Fragmentation is a form of asexual reproduction in which an organism breaks into two or more fragments, and each fragment develops into a new individual. Both sponges and sea anemones are examples of organisms that exhibit this mode of reproduction.

Sponges are simple multicellular animals that lack true tissues and organs. They possess a porous body structure, and when a sponge is fragmented, each fragment has the potential to develop into a new sponge through regeneration. These fragments contain specialized cells called archaeocytes that can differentiate into various cell types required for the formation of a new sponge.

Sea anemones, on the other hand, are marine animals belonging to the phylum Cnidaria. They have a cylindrical body with tentacles surrounding their mouth. When a sea anemone is fragmented, each piece can regenerate into a complete individual. The process involves the differentiation of cells within the fragments, leading to the development of new tentacles, body parts, and eventually a mature sea anemone.

Both sponges and sea anemones have remarkable regenerative abilities, allowing them to reproduce through fragmentation. This form of asexual reproduction enables them to colonize new areas, expand their population, and adapt to changing environmental conditions. Therefore the correct option is D

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The Question was Incomplete, Find the full content below :

The organisms which can reproduce by fragmentation are:

(a) Corals and Sponges

(b) Corals and Spirogyra

(c) Sea anemone and Spirogyra

(d) Sponges and Sea anemones.

Answer:

Sick building syndrome

Explanation:

An ecological term that best describes the picture below would be community. Thus, option C is correct.

In science, a community, also known as a biological community, is a conversing source of numerous species in a centralized place.

A biological community, for example, is a forest of trees and undergrowth plants inhabited by animals and rooted in soil containing bacteria and fungi.

Strong communities are crucial because they are a source of social connection and a sense of community for many people.Participating in a community united by attitudes, values, and goals is a necessary component of living a fulfilling life.

It includes elements like image, spirit, character, and pride, as well as processes like interaction, inter-group interaction, and networking. A community is made up of individuals with diverse interests, experiences, and backgrounds.

Thus, the correct option is C, as per the given scenario.

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The type of mutation that plays the most important role in increasing the number of genes in the gene pool is gene duplication allowing for mutations to accumulate and expand the genome over generations.

Mutation is a any change that alters the nucleotide sequence of DNA molecules caused by mutagens or errors during DNA replication.

Mutation can be of different types including;

Duplication mutation causes the number of nucleotides to increase, hence, increasing the number of genes in the gene pool.

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Answer:

The correct answer is D. Gene duplication allowing for mutations to accumulate and expand the genome over generations

Explanation:

This is correct because it is the most important role in increasing the number of genes in the gene pool.

Answer:

5,700 to 6700

Explanation:

Answer:

The crane has a sharp and pointed beak adapted for catching and grasping prey. The sharp beak allows the crane to effectively stab and pierce its prey, such as fish, frogs, or small animals. The pointed shape helps the crane to accurately target its prey and secure a firm grip.

On the other hand, the duck has a flat beak, which is better suited for its specific feeding habits. Ducks are primarily filter feeders, and their flat beak enables them to sift through water or mud to collect small organisms, insects, and plants. The flat beak acts like a sieve, allowing the duck to strain out food particles while retaining water.

The difference in beak shape between the crane and the duck reflects their distinct feeding strategies and ecological roles. Each species has evolved its beak shape to optimize its ability to capture and consume the specific types of food sources available in their respective habitats.

Answer:

The correct answer is - 5 times

Explanation:

Given:

area of P1 = 2.5

area of P2 = 0.5

Solution:

Let assume:

area of P1 is x times of the area of P2

then the equation would be:

=>  2.5 = x*0.5

=>  2.5/0.5 = x

=> 5 = x

Thus, area of P1 is 5 times to the area of P2

Answer: Option A, Winds is correct

Explanation:

Ocean currents are caused by wind action. A horizontal movement of ocean water that is caused by wind occurs at or near the oceans surface.

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Answer:

electrons

Explanation:

1. When Valsalva maneuvre is done, then intrathoracic pressure is increased as the expiration is done forcibly against the closed glottis.

2. Raised intrathoracic pressure compresses the lungs and blood to left atrium is increased. Left atrium sends this blood to the left ventricle.

3. When blood is increased in left ventricle, it will contract more efficiently causing more stroke volume and cardiac output.

4. More cardiac output increases the systolic blood pressure.

5. Intrathoracic pressure is increased which further compresses the vena cava and venous return to right atrium is decreased.

6. Decrease in venous return means less blood will go to the left ventricle. Left preload causes less contraction and stroke volume is reduced. Cardiac output reduces.

7. To compensate for decreased cardiac output, the vessels undergo vasoconstriction and the heart rate is also increased.

8. The raised systolic blood pressure reflexively decrease the raised heart rate and heart rate becomes Normal.

Intrathoracic pressure influences venous go back and therefore cardiac output and arterial pressure. Inspiration drops intrathoracic stress, dilates the thoracic vena cava, and acutely decreases atrial filling. Cardiac output falls, and therefore arterial stress falls.

High quality-pressure air flow increases intrathoracic stress. when you consider that diaphragmatic descent will increase intra-belly strain, the decrease inside the strain gradient for venous return is much less than would in any other case occur if the only exchange have been an boom in proper atrial stress.

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Teresa could be able to solve problems creatively in C. To demonstrate the relationship between kinetic and potential energy, she should choose a personal example of each and design an experiment to demonstrate it.

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Complete question : Teresa wants to explore the relationship between kinetic energy and potential energy. How could she use innovative problem-solving?

A. Follow the instructions of her science teacher for performing an experiment about kinetic and potential energy.

B. Search the internet for ways to show the relationship between kinetic and potential energy.

C. Find an example of kinetic and potential energy in her own life and create an experiment to illustrate their relationship.

D. Study the relationship between kinetic and potential energy in her science textbook.

Answer:

Increasing Demand

Explanation:

Answer: public demand

Explanation:

The ATP yield from 2 moles of mitochondrial NADH under aerobic conditions in a eukaryotic cell is approximately 4 moles of ATP.

Since there are 2 moles of mitochondrial NADH, the total ATP yield would be around 4 to 6 moles of ATP. However, the most accurate option among the given choices is 4 moles of ATP.

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Answer:

They can grow large

Explanation:

in other words expand

Answer:

2. Worm Y reproduces sexually, which gives it genetic variation.

Explanation:

Worm Y was born sexually from two parents meaning it has DNA from both parents giving it a better chance at surviving. Worm X was born asexually giving it identical DNA to its parent. Worm X is only going to be able to live in one habitat.

I also got it right on the quiz.

Answer:

The Second One

Explanation:

Took It On Edge 2021

Answer:

Tumor

Explanation:

When cell division does not occur in the usual pattern, a tumor results. This is also the major cause of cancer as there is usually the presence of tumors or cancerous cells

These cells multiply through cell division rapidly and abnormally thereby causing problems in the organisms as a result of them affecting and spreading to other parts of the body which are close to the tumor growths.

In the practice of science, hypothesis testing is used to develop explanations, acknowledging the possibility of alternative, more accurate explanations.

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Bottled water is often more expensive, produces transportation pollution, and contributes to plastic waste. In contrast, tap water costs less, doesn't generate transportation pollution, and doesn't produce plastic waste. Tap water is also typically held to more stringent quality standards than bottled water.

To correctly categorize each phrase as describing bottled water or tap water, let's analyze the given options:

1. Costs less: This phrase generally describes tap water. Tap water is often more cost-effective compared to bottled water, as it is supplied through municipal water systems and is readily available in households. Bottled water typically incurs additional costs associated with production, packaging, and transportation.

2. Produces transportation pollution: This phrase primarily applies to bottled water. The production and distribution of bottled water involve transportation, which contributes to carbon emissions and pollution. Tap water, on the other hand, doesn't typically generate transportation pollution since it is supplied through local water infrastructure.

3. Produces plastic waste: This phrase specifically pertains to bottled water. Bottled water is packaged in plastic containers, contributing to plastic waste and environmental concerns. Tap water, however, doesn't produce plastic waste as it is consumed directly from the tap without additional packaging.

4. Held to more stringent quality standards: This phrase generally describes tap water. Tap water is regulated by governmental agencies and must adhere to strict quality standards, including regular testing and monitoring. Bottled water is also subject to quality regulations, but the oversight and standards applied to tap water are often more extensive.

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The trend that is evident is: Initially, there seems to be support for Mel's hypothesis, but the gold data is not consistent with the predicted trend.

Option C is correct.

The data for zinc, nickel, copper, and silver shows that as the density increases, the melting point tends to increase.

From the data we can see , the data for gold does not follow this trend, as its density is lower than silver but its melting point is higher.

Therefore, while there is some initial support for Mel's hypothesis, the inconsistency with gold indicates  that the relationship between density and melting point is not solely determined by density.

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Answer:

temperature, light, and water

Explanation:

An abiotic factor is a non-living part of an ecosystem that shapes its environment. In a terrestrial ecosystem, examples might include temperature, light, and water. In a marine ecosystem, abiotic factors would include salinity and ocean currents. Abiotic and biotic factors work together to create a unique ecosystem.

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Answer:

Human Immunodeficiency viruses

HIV Overview

HIV (human immunodeficiency virus) is a virus that attacks the body’s immune system. If HIV is not treated, it can lead to AIDS (acquired immunodeficiency syndrome).

There is currently no effective cure. Once people get HIV, they have it for life.

But with proper medical care, HIV can be controlled. People with HIV who get effective HIV treatment can live long, healthy lives and protect their partners.

History of HIV

HIV infection in humans came from a type of chimpanzee in Central Africa.

The chimpanzee version of the virus (called simian immunodeficiency virus, or SIV) was probably passed to humans when humans hunted these chimpanzees for meat and came in contact with their infected blood.

Studies show that HIV may have jumped from chimpanzees to humans as far back as the late 1800s.

Over decades, HIV slowly spread across Africa and later into other parts of the world. We know that the virus has existed in the United States since at least the mid to late 1970s.

To learn more about the history of HIV in the United States and CDC’s response to the epidemic, see CDC’s HIV and AIDS Timeline.

How do I know if I have HIV?

The only way to know for sure whether you have HIV is to get tested. Knowing your HIV status helps you make healthy decisions to prevent getting or transmitting HIV.

Are there symptoms?

Graphic listing symptoms of HIV: Fever,HIV Symptoms and Testing, Chills, Rash, Night sweats, Muscle aches, Sore throat, Fatigue, Swollen lymph nodes, and Mouth ulcers.

Some people have flu-like symptoms within 2 to 4 weeks after infection (called acute HIV infection). These symptoms may last for a few days or several weeks. Possible symptoms include

Fever,

Chills,

Rash,

Night sweats,

Muscle aches,

Sore throat,

Fatigue,

Swollen lymph nodes, and

Mouth ulcers.

But some people may not feel sick during acute HIV infection. These symptoms don’t mean you have HIV. Other illnesses can cause these same symptoms.

See a health care provider if you have these symptoms and think you may have been exposed to HIV. Getting tested for HIV is the only way to know for sure.

What are the stages of HIV?

When people with HIV don’t get treatment, they typically progress through three stages. But HIV medicine can slow or prevent progression of the disease. With the advancements in treatment, progression to Stage 3 is less common today than in the early days of HIV.

Stage 1: Acute HIV Infection

Stage 1: Acute HIV Infection

People have a large amount of HIV in their blood. They are very contagious.

Some people have flu-like symptoms. This is the body’s natural response to infection.

But some people may not feel sick right away or at all.

If you have flu-like symptoms and think you may have been exposed to HIV, seek medical care and ask for a test to diagnose acute infection.

Only antigen/antibody tests or nucleic acid tests (NATs) can diagnose acute infection.

Stage 2: Chronic HIV Infection

Stage 2: Chronic HIV Infection

This stage is also called asymptomatic HIV infection or clinical latency.

HIV is still active but reproduces at very low levels.

People may not have any symptoms or get sick during this phase.

Without taking HIV medicine, this period may last a decade or longer, but some may progress faster.

People can transmit HIV in this phase.

At the end of this phase, the amount of HIV in the blood (called viral load) goes up and the CD4 cell count goes down. The person may have symptoms as the virus levels increase in the body, and the person moves into Stage 3.

People who take HIV medicine as prescribed may never move into Stage 3.

Stage 3: Acquired Immunodeficiency Syndrome (AIDS)

Stage 3: Acquired Immunodeficiency Syndrome (AIDS)

People with AIDS have such badly damaged immune systems that they get an increasing number of severe illnesses, called opportunistic infections.

People receive an AIDS diagnosis when their CD4 cell count drops below 200 cells/mm, or if they develop certain opportunistic infections.

People with AIDS can have a high viral load and be very infectious.

Without treatment, people with AIDS typically survive about three years.

Answer:

False. Eutrophication is an enrichment of water by nutrient salts that causes structural changes to the ecosystem such as: increased production of algae and aquatic plants, depletion of fish species, general deterioration of water quality and other effects that reduce and preclude use”.

Two cities in Europe are Berlin and Paris. The temperature in Berlin today is 14°C while that of Paris is 16°C.

The geographic factor that explains the difference in temperature and the difference in rainfall between the two cities include ocean currents and elevation.

Temperature is a measure of how hot or cold something is represented in terms of one of several scales, including Fahrenheit and Celsius. Temperature determines the direction in which heat energy will spontaneously flow—that is, from a hotter (higher temperature) body to a colder (lower temperature) body.

When a body is heated, its temperature rises, while it reduces when it is cooled. Rainfall, on the other hand, is the total amount of rain that falls in a specific location over the course of a month, year, etc.

Around the planet, there is a link between latitude and temperature, with temperatures being warmer near the Equator and cooler near the Poles. However, there are differences since other factors such as height, ocean currents, and precipitation influence climatic patterns. It's important to o note that the elevation and o ran currents have a role to play in the difference in temperature.

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