What did scientists use to think dinosaurs were descended from A. Dinosaurs B. Iguanas C. People

Question: Two forces are applied to a 45 kg box, as shown. The box is on a smooth surface.Which statement best describes the acceleration of the box?  Assuming the diagram is similar to the one attached.

A) The box accelerates at 1.0 m/s² to the right because the net force is 45 N to the right.

B) The box accelerates at 1.9 m/s² to the right because the greater force is to the right.

C) The box accelerates at 3.0 m/s² because the combined forces cause the box to accelerate.

D) The box does not accelerate, because neither force is large enough to move the box.

Answer:

A) The box accelerates at 1.0 m/s² to the right because the net force is 45 N to the right.

Explanation:

From the diagram attached,

F₂-F₁ = ma.................. Equation 1

Where F₂ = Force acting to the rigth, F₁ = Force acting to the left, m = mass of the box, a = acceleration of the box.

Make a the subject of the equation

a = (F₂-F₁)/m............... Equation 2

also from the diagram

Given: F₂ = 55 N, F₁ = 10 N, m = 45 kg.

Substitute these values into equation 2

a = (55-10)/45

a = 45/45

a = 1 m/s²

Hence the box accelerate at 1.0 m/s² to the right because the net force is 45 N to the right. Hence the right option is A.

The relationship you are describing, where the cattle egret benefits from the Burchell's zebra's behavior without harming the zebra, is called commensalism.

Mutualism is a type of symbiotic relationship in which both species involved benefit from their association. In the case of the cattle egret (bird) and the Burchell's zebra (mammal), the cattle egret benefits by foraging near the zebra, while the zebra benefits from the egret's presence.

The cattle egret obtains its benefits by engaging in a behavior known as "commensal foraging." It closely follows or walks alongside the grazing zebra, taking advantage of the disturbances caused by the zebra's movement.

As the zebra grazes on grass and disturbs insects in the process, the cattle egret takes advantage of the insects that are flushed out and becomes an opportunist forager.

The egret feeds on insects, such as flies and ticks, that are stirred up by the zebra's movement, effectively reducing the ectoparasite load on the zebra's body.

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Answer:  When the carbon dioxide concentration goes up, temperature goes up. When the carbon dioxide concentration goes down, temperature goes down.

Explanation:

Answer:

Antiacids, antibiotics and mint (Peppermint oil is under preliminary research for its potential as a short-term treatment for irritable bowel syndrome)

Antacids and antibodies are the pharmacological treatments. Therefore, the correct statements are option A and option E.

Pharmacological treatments are drugs that help to treat various medical conditions. They act by changing the biochemical and physiological properties of a body to cure the underlying disease.

Antacids used to treat stomach acid and conditions like heartburn by raising the pH of the stomach acid, thereby, relieving the digestion problems. Antibodies are also used to treat bacterial infections by targeting the growth of bacteria.

Endoscopies and ultrasounds, on the other hand, are used to examine internal organs or tissues and mint is a natural remedy to relieve digestion problems.

Therefore, antacids and antibodies are pharmacological treatments.

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Answer:

The chemical equation for lactic acid fermentation after glycolysis is: Glucose + 2 ADP + 2 P + 2 NADH → 2 Lactic acid + 2 ATP + 2 NAD+ This equation shows that glucose is broken down into two molecules of lactic acid, producing two molecules of ATP and two molecules of NAD+. This process occurs after glycolysis when there is insufficient oxygen available to continue with aerobic respiration.

Answer:

amino acids.

Explanation:

Answer:

Amino acids

Explanation:

I searched it up

The reason of the expected structures were not observable is microscope not that advanced

In the field of microscopy, the resolution and capability of the microscope play a crucial role in determining which structures can be observed and which cannot. The expected structures may be too small or too complex to be resolved by the available microscopy techniques.

For instance, if the structures of interest are smaller than the wavelength of light, then conventional optical microscopy will not be able to visualize them. In this case, other microscopy techniques such as electron microscopy or atomic force microscopy may be required.

Moreover, some structures may be too delicate or sensitive to be observed under normal conditions, and attempts to observe them may damage or alter the structure. Additionally, some structures may only exist under specific conditions or may be obscured by other components in the sample, making them difficult to observe.

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The given question is incomplete, the complete question is:

When we observe structures using microscope, why all of the expected structures were not observable?

Answer:

it is c

Explanation:

In order to determine whether you have hypoxia, your doctor will need to check the amount of oxygen in your blood. Therefore, option (C) is correct.

Hypoxia is low levels of oxygen in your body tissues. It causes symptoms like confusion, restlessness, difficulty breathing, rapid heart rate, and bluish skin.

Moreover, hypoxia is a state in which oxygen is not available in sufficient amounts at the tissue level to maintain adequate homeostasis; this can result from inadequate oxygen delivery to the tissues either due to low blood supply or low oxygen content in the blood (hypoxemia).

Hence, heart and lung function issues can lead to five categories of conditions that cause hypoxemia: ventilation-perfusion (V/Q) mismatch, diffusion impairment, hypoventilation, low environmental oxygen and right-to-left shunting.

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Answer:

a. Water, urea, mineral salts and pigments

Explanation:

The composition of urea of a normal healthy human consist of Water, urea, mineral salts and pigments. The water which is present in excess amount in our body will be removed by the body. Our body need salts in low amount which is taken from the food while the excess amount of salts and some pigments in the foods are also removed through the process of excretion and added into the urine. Due to these pigments, the color of urine is yellowish.

Answer:

Hello! your answer is the very last option at the bottom!

Answer:

The Last One

Explanation:

Answer: C

Explanation: it produces nitrogen compounds that humans can breath . It is the only logical choice.

It converts nítrogen into a form that humans can obtain by eating other organisms.

The conversion of nitrogen between its different life-supporting forms, including nitrates and ammonia, occurs naturally as part of the nitrogen cycle. The nitrogen cycle creates free nitrogen that people can breathe, which is one of the most significant ways it is vital to people.

Humans cannot survive without nitrogen, which is necessary for all life. Additionally, the nitrogen cycle changes nitrogen into a form that people can consume by eating other living things like plants and animals. This is significant because it enables people to obtain the essential nutrients from their diet.

The nitrogen cycle also creates nitrogen molecules for human inhalation. These substances are crucial for preserving a healthy environment and can lessen the impacts of air pollution.

Last but not least, the nitrogen cycle also changes nitrogen into a form that people can absorb via their skin. This can lower the chance of developing specific medical disorders by preserving a healthy balance of nitrogen in the body.

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Answer:

Anabolic reactions, also called biosynthesis reactions, create new molecules that form new cells and tissues, and revitalize organs.

Explanation:

Answer:

When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air. Greenhouse gases trap heat in our atmosphere, causing global warming. Already the average global temperature has increased by 1C.

Explanation:

Mytilus would have a decreasing population trend over time.

In an experiment, the control group either receives no treatment, a standard treatment whose effect is known, or a placebo.

The experimental group also known as the treatment group, receives the treatment whose effect the researcher is interested in.

In the experiment on the effect of the presence of Pisaster on the population of Mytilus, the data obtained is given in the picture.

Based on the data obtained, it can be hypothesized that the population numbers for Mytilus would have a decreasing population trend over time.

In conclusion, the population of species change with changes in factors affecting population such as predators.

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The answer is B and C are substrates

The cardiac conduction system is responsible for the rhythmic contraction of the heart muscle and the generation of electrical signals that control the heart rate. It is composed of specialized muscle cells and nerves that are found throughout the heart. The main components of the system include the sinoatrial (SA) node, the atrioventricular (AV) node, the Bundle of His, the Purkinje fibers, as well as the right and left bundle branches.

The SA node is the heart's natural pacemaker and is located in the right atrium. It is responsible for initiating the electrical impulse that signals the heart muscle to contract. The impulse then travels through the AV node, located at the base of the right atrium, where it slows down before passing through the Bundle of His. This bundle contains specialized fibers that help conduct the electrical impulse to the ventricles. From there, the impulse is transmitted to the Purkinje fibers, which are located in the ventricles. Finally, the impulse is sent to the right and left bundle branches, which help distribute it to the rest of the heart muscle. Through this process, the heart is able to maintain a regular rhythm and beat.

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Answer:

its the 2nd one i think

Explanation:

Doesnt give a whole lot of context but this is based off of my knowledge

Reducing Sugars : 1. Benedict's test2. Fehling's test3. Barfoed's test.. A brick-red precipitate indicates the presence of reducing sugar.The absence of a brick-red precipitate implies that there is no reducing sugar.The reddish-brown precipitate suggests the existence of monosaccharides.The existence of disaccharides is revealed by the green precipitate.

When conducting tests for reducing sugars, lipids, proteins, and starch, different methods, observations, and conclusions are employed. The methods used to carry out these tests differ depending on the substances being tested.The table below shows the methods, observations, and conclusions when carrying out tests for reducing sugars, lipids, proteins, and starch. Method Observation Conclusion

Lipids : 1. Emulsion test2. Solubility test .The formation of a milky white layer indicates the presence of lipids.The absence of a milky white layer implies the absence of lipids.The sample forms two separate layers during the test.The fat in the sample is the upper layer.

Proteins : 1. Biuret test2. Xanthoproteic test3. Millon's test The sample turns purple when Biuret's reagent is added to it.A yellow colour develops when Xanthoproteic acid is added to the sample.A brick-red precipitate shows that Millon's reagent was present.The existence of peptides or proteins is revealed by a purple or violet colour.

Starch : 1. Iodine testThe blue-black colour in the sample indicates the existence of starch.Absence of a blue-black colour shows the absence of starch.

Therefore, the above table indicates that the methods used, observations made, and conclusions drawn when carrying out tests for reducing sugars, lipids, proteins, and starch differ depending on the substances being tested.

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This approach to gene therapy is known as ex vivo gene therapy. In this process, some of a patient’s bone marrow stem cells are removed from the body and exposed to a virus that contains a functional gene.

Therapy is a form of psychological treatment used to help people process and work through emotional and mental health issues. It is typically provided by a trained mental health professional such as a psychologist, psychiatrist, counselor, or therapist.

The virus is designed to deliver the functional gene into the stem cells, allowing them to produce the desired protein or other product. Once the stem cells have been “infected”, they are returned to the patient’s body and continue to produce the desired product. This allows the patient to benefit from the effects of the functional gene without having to undergo the risks of direct gene transfer into the body, such as the risk of causing an immune response. Ex vivo gene therapy is currently being used to treat a variety of genetic conditions, including blood diseases and cancers that are caused by a genetic mutation.

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I am not entirely sure what you mean by "responding variable" but I'm going to guess  it was the vinegar since it has been used as a  perservative for years.

Hope that helps in some way.

The amount of sugar required to grow 10 grams of bacteria aerobically can be calculated based on the given information. The Correct option is B

If it takes 160 grams of sugar to grow 10 grams of bacteria anaerobically, then we can assume that it takes 16 grams of sugar to grow 1 gram of bacteria (160/10=16). This is the ratio for anaerobic respiration.

Aerobic respiration is more efficient than anaerobic respiration, meaning that less sugar is required to produce the same amount of bacteria. According to scientific studies, aerobic respiration is around 16 times more efficient than anaerobic respiration.

Therefore, we can divide 16 by 16 to get 1 gram of sugar required to grow 1 gram of bacteria aerobically. Multiplying this by 10 (the amount of bacteria we want to grow) gives us 10 grams of sugar required to grow 10 grams of bacteria aerobically.

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d. 2 grams: aerobic respiration is 80 times more efficient than anaerobic respiration

Respiration is a chemical reaction which takes place in all livings cells and releases energy from glucose. Anaerobic respiration occurs without oxygen and releases less energy but more quickly than aerobic respiration. Anaerobic respiration in microorganisms is called fermentation.

Aerobic respiration uses oxygen to break down sugar and produce energy for the cell, which is much more efficient than anaerobic respiration that does not use oxygen. Therefore, only a small amount of sugar is needed to produce the same amount of bacteria aerobically compared to anaerobically.

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Protein is essential during the postoperative recovery period for tissue synthesis and wound healing. It plays a crucial role in rebuilding and repairing damaged tissues, such as muscles, skin, and organs. Additionally, protein helps to boost the immune system, which can be weakened after surgery.

Adequate protein intake is necessary to promote optimal recovery and prevent complications. Therefore, it is recommended that individuals recovering from surgery consume a diet that is rich in high-quality protein sources, such as lean meats, fish, poultry, eggs, dairy products, and legumes.

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Answer:

A Monosaccharide is just the simplest form of sugar. It's general term applied to a sugar that cannot be broken down into anything 'simpler'. A great example of this is glucose. Glucose cannot be hydrolized to form anything else, but there are more complex forms of glucose like glycogen. Glycogen is basically a bunch of glucose molecules bonded together and used as "stored glucose", but glycogen can be hydrolized to form individual glucose molecules (monosaccharides).

Answer:

The answer is A. Test variable (independent variable)! :)

Explanation:

Hope this helps; I took the test and got it correct!!

Don't forget to mark the this Brainliest if this helped! :)

The experiment is designed to test "What is the effect of increasing heat on the heart rate of Daphnia?" The microscopic water flea is placed in a petri dish and examined under a directed microscope that is fastened with a heat-producing lamp.

The heartbeat of the Daphnia is then counted for 15 seconds at two-minute intervals, allowing the researchers to observe and measure any changes in the heart rate of the Daphnia as a result of the increased heat. The fact that the Daphnia was placed under a heat-producing lamp and its heart rate was measured at various intervals further supports the conclusion that the experiment was designed to test the effect of heat on the heart rate of Daphnia.

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Answer:

the uvea

Explanation:

Hope this helps!

Answer:

Melanocytes are found in the middle layer of the eye, known as the uvea, composed of the choroid, the iris and the ciliary body.

he dna is intact; the cell has plenty of nutrients and spaceare the main conditions the cell checks for before passing the s/g1 checkpoint

The correct replication of DNA during the S phase is one of the important activities controlled by the cell cycle checkpoint monitoring system. Even when all cell cycle regulators are completely functional, a tiny proportion of replication mistakes (mutations) are passed on to daughter cells.

The cell must pass the G1 checkpoint before moving on to the next phase of interphase. This requires the presence of cyclin proteins as well as the correct biological circumstances. If the cell survives the checkpoint, it will enter the S phase, which is when DNA replication occurs.

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Answer:

Gametes

Explanation:

Gametes are an organism's reproductive cells. They are also referred to as sex cells. Female sex cell is called the ovum while the male sex cell is called sperm. When these two sex cells come together during fertilization they form the gamete, which is made up of diploid number of chromosomes. Gametes are normally formed through meiosis, during the cell division, the germ cell undergo two fission, which results in four gametes.

Answer:

A. Gametes

Explanation:

E2020