Andy's teacher asked him to come up to the front of the class to demonstrate work. Which of the following could Andy do in the classroom to demonstrate work? A. Andy pushes a desk across the floor. B. Andy sits in his chair, doing nothing. C. Andy pushes against a desk, and it doesn't move. D. Andy holds a book.

1. Cells

2. Tissues

3. Organs

4. Organ Systems

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Answer:

Explanation:

1. Cells

2. Tissues

3. Organs

4. Organ Systems

Answer:

lichens

mycorrhiza

Explanation:

Lichens are formed by two types of organisms- an alga and fungus. The mycelium of the fungus forms athin mat which offers anchorage and protection to some microscopic algae. The alga provides the fungus with sugars which it produces through photosynthesis.

Mycorrhiza is a type of symbiotic relationship between a saprophytic fungus and vascular plants such as coniferous trees. The fungus develops in the soil near the base of the tree. Some of the hyphae penetrate into the outer layers into the soil from which it obtains mineral ions. It also decomposes proteins to their amino acids. The fungus shares these nutrients with its tree host.

Explanation:

The nucleus is a large membrane-bound organelle that houses the genetic information, DNA, in the cell.

Sequences of DNA make up genes which can have different forms called alleles. DNA is transcribed into mRNA and later translated into amino acids which are linked together by rRNA to form proteins.

Further Explanation:

All the genetic information within the eukaryotic cell is stored within the nucleus as helical DNA. This DNA is tightly wound around histones as chromosomes. Chromosomes within the nucleus is unwound, unzipped and read by enzymes in a complex series of steps known as transcription. The message on DNA, called genes is copied by RNA polymerase, to form mRNA complementary sequence to that of the DNA strand. These are then translated into proteins in ribosomes.

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The death of mice from cancer is an ethical issue, and the solution is to keep them alive through treatment.

One of the most serious ethical considerations would be the welfare of the rats used in the experiments. The rats could die after getting the malignant cells. If the new medicine fails to work, the animals may experience side effects before dying. This problem could be remedied by performing studies on tissue samples rather of animals.

The mice will die from cancer during this research, but it is vital for the growth of medical sciences and the discovery of medicines for the treatment of cancer and other severe diseases. The solution to this problem is to take specific steps to prevent the mice from dying while also conducting the research properly, allowing us to decide that the death of the mice during the experiment is an ethical concern.

Thus, The rats could die, which would raise ethical concerns.

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Answer:

Many evolutionary changes resulted in the transition of aquatic vertebrates into terrestrial organisms. Some of these are:

In terrestrial organisms, the respiratory system is more complex and enhanced than the aquatic vertebrates. For instance, the early amphibians had gills for respiration. But with the passage of time, lungs appeared which made life on land more feasible.

The formation of rigid and insulated body coverings also was an adaptation that emerged for making life feasible on land.

Limbs allowed movement on land. With the passage of time, feet developed from the limbs.

Answer:

The correct option is D. The Linnaean System showed relationship between organisms based on observable characteristics.

Explanation:

Carolus Linnaeus is known as the father of taxonomy. Two main important contributions by Carlous Linnaeus were:

Linneaus Classification divided organisms into

The method of binomial nomenclature uses the technique of naming organisms based on the genus and species name. This name is known as scientific name and it provides a unique name to each organism.

5 hours

Explanation:

Because it will

An omnivore eats both plants and animals!

Badgers, pandas, raccoons, and dogs are examples of omnivores I think!

Answer: human, raccoons, opossums, pigs, rats, badgers, and most bear species

Explanation:

Answer:

The cell membrane is semi permeable which allows for diffusion of substances in and out of the cell. Most notably is osmosis across the cell membrane to maintain the osmotic pressure within the cell for the cell to maintain its structural integrity.

Explanation:

Answer:

The limiting factors are oxygen concentration, carbon dioxide concentration and light intensity

Explanation:

All the factors have to be in efficient amounts for photosynthesis to take place. If one is inefficient, the process will be affected; just like a three legged stool, if you remove one leg, the chair won't be able to stand.

Answer:

Option A, B and C are correct

Explanation:

The major limiting factors for this experimental setup would be –  

1) Light intensity – Photosynthesis can occur even at a low intensity light but to achieve the maximum efficiency and output the intensity of light must be high. This is the reason why plants photosynthesize the maximum during the brightest time of the day.  

2) Concentration of carbon dioxide – Higher the concentration of carbon dioxide, higher is the rate of photosynthesis. Plants take carbon dioxide from the atmosphere.  

3) Oxygen – The oxygen concentration must be favorable for photosynthesis up to its optimum level. Beyond the optimum oxygen level, the photosynthesis process inhibits.  

To produce 125 g of oxygen, 250 moles of mercury (II) oxide are needed.

To determine the number of moles of mercury (II) oxide needed to produce 125 g of oxygen, we need to use the molar ratio between mercury (II) oxide and oxygen. From the balanced equation, we can see that 2 moles of mercury (II) oxide produce 1 mole of oxygen. Therefore, we set up a proportion:

(2 moles HgO) / (1 mole O2) = (x moles HgO) / (125 g O2)

Then, we cross multiply and solve for x:

x moles HgO = (2 moles HgO / 1 mole O2) * (125 g O2)

After calculation, we find that x is equal to 250 moles of mercury (II) oxide.

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To produce 125 g of oxygen (O₂), you need 7.8125 moles of mercury(II) oxide (HgO). This calculation is based on the balanced chemical equation and the molar mass of O₂. Hence, 7.8125 moles of HgO are required.

To determine how many moles of mercury(II) oxide (HgO) are needed to produce 125 g of oxygen (O₂), we use the balanced chemical equation:

2 HgO → 2 Hg + O₂

Here are the steps:

First, find the molar mass of O₂:

Next, we calculate the moles of oxygen gas (O₂ )

According to the balanced equation, 1 mole of O₂ is formed from 2 moles of HgO.

Therefore, 7.8125 moles of mercury(II) oxide are needed to produce 125 g of oxygen.

Answer:

The correct option is A. Nucleus

Explanation:

The diagram in the question shows a paramecium, euglena and amoeba.

Paramecium can be describe as a fresh water animal which has a body covered with cilia. Flagellum and Pseudopodia​ lack in paramecium

Amoeba can be described as single celled organisms which have Pseudopodia for movement and shape changing.

Euglena is a single- celled organism capable of living is salt water as well as fresh water. It contains flagellum for movement but lacks cilia and Pseudopodia.

The structure common in all these organisms is the nucleus. Nucleus is present in every eukaryotic organism.

Answer:

The correct answer is C glucokinase is not a zymogen

Explanation:

zymogens are secreted as inactive enzyme which undergo activation by autocatalysis which deals with the removal of short peptide fragment from that zymogen resulting in the formation of active enzyme.

 Foe example chymotrypsin enzyme is secreted as zymogens but not glucokinase.

Answer:

The water vascular system of echinoderms is essentially a system of fluid-filled canals that extend along each of the body regions and have many external projections called tube feet. There are several functions of the system, one of which is to use water pressure to mediate movement and assist in feeding. ... Stone canal.

Final answer:

The water vascular system in echinoderms is essential for feeding as it uses hydrostatic pressure to extend and retract tube feet, enabling the organism to capture and handle prey. This system also aids in nutrient circulation and gas exchange.

Explanation:

Role of the Water Vascular System in Feeding

Echinoderms possess a distinctive water vascular system which plays a crucial role in the organism's feeding behavior. This system comprises a network of canals and tube feet that project through the skeleton of the creature. During feeding, the tube feet are employed to capture prey through suction, thanks to their ability to expand and contract using the hydrostatic pressure within the system.

The water vascular system allows echinoderms to maneuver prey into place and assist in the handling and transport of food to the mouth. Water enters through the madreporite, passes to the ring canal, and then through the radial canals, powering the tube feet for the execution of feeding activities. The system also facilitates nutrient circulation and gas exchange, vital processes for the echinoderm's survival.

Overall, the water vascular system's ability to create hydrostatic pressure enables echinoderms not only to locomote and engage in prey manipulation but also significantly contributes to their potential to feed effectively in their aquatic ecological niches.

Answer:

D . natural events and human activity

Answer:

W- developed seeds

X-angiosperm

Explanation:

Well for one, these two are the only things w/ a referrable image (I'm not sure if that's a word :-)) Another thing is angiosperm literally means flowering plant and a tomato is a ripe, or flowering, plant. W is an image of seeds that are at mid stage in there developing process, so it is clearly the answer. Correct me if im wrong :-D.

Answer:

Similar DNA sequences would be indicative of a recent common ancestor hence the answer should be divergent evolution as the different appearances are evidence of divergence from a common ancestor.

It is unlikely to be convergent evolution as convergent evolution likely results in animals with similar appearances. Convolution would indicate similar modes of evolution between 2 different species that aided each other over time. While this is a product of gradualism, this is not evidence for gradualism directly.

Final answer:

Very different looking anoles with similar DNA sequences on the same Caribbean Islands are evidence of divergent evolution, where one species evolves into multiple distinct species with different adaptations.

Explanation:

Very different looking anoles on the same Caribbean Islands with similar DNA sequences are an example of divergent evolution. This process involves a single species evolving into multiple distinct species that adapt to different environments or niches. Anoles showing varied physical characteristics despite sharing similar DNA suggests that they have adapted to different conditions on the same island, a phenomenon that aligns well with the concept of adaptive radiation, where a single species gives rise to many, filling different ecological roles.

Divergent evolution is usually the result of one species spreading to different and isolated environments, leading to varied adaptations and characteristics due to genetic drift and natural selection. An example of divergent evolution on islands is also seen with Darwin's finches, where one ancestral species gave rise to multiple new species, each adapted to a distinct food source or niche.

Answer

P53 is tumor antigen protein .

Explanation

This protein is isoform of tumor protein 53 and Trp53 . It is tumor suppressor protein .As it maintain conservation of genome by maintaining stability of genome. The gene p53 is mostly known as tumour suppressor gene . The 53 indicate the molecular weight of the protein which ix 53 kDa on SDS gel. It also activate DNA repair protein..

Science is the intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.

Examples: anthropology, archaeology, astronomy, biology, botany, chemistry, cybernetics, geography, geology, mathematics, medicine, physics, physiology, psychology

Answer: geography

Explanation:

Answer:

The number of chromosomes is maintained through the process of mitosis during asexual reproduction.

Mitosis can be described as a process in which a cell divides and produces two daughter cells which are exactly similar to the parent cell. The chromosome number of the daughter cells will be the same as the parent cells. No crossing over or recombination occurs during this type of cell division. Hence, mitosis is an effective way to maintain the chromosome number of organisms which reproduce asexually.

The no of chromosomes of a organism of each generation is maintained  due to the meiosis.

Explanation:

The meosis is a kind of reductive division for the higher organisms and for the higher organism it is mitosis. The mitosis is the phase where the organism reproduce asexually, in this phase the two resulting daughter cells always contains the same no of chromosomes as the parent cell from which they derive.

The role of chromosomes is to maintain the each cell division is constant. It help us to enable us to grow and self maintenance of the body.

Answer:

The correct option is A. Nucleotide sequence, human, hemoglobin

Explanation:

If the segment of the DNA for the human gene is known then it will be very easy to find the gene on a database. The tags which should be used will be the nucleotide sequence, where the known sequence shall be mentioned.

Then we will choose the tag for the organism which is humans in this case. Then we will select the tag for the protein which is made by the nucleotide sequence, which is protein in this case. Hence, option A is the correct answer.

Answer:

D. the new moon at perigee coming between Earth and the sun along a straight line

Explanation:

A new moon at perigee is significantly bigger than a new moon at apogee. Only a new moon at perigee is able to cover the sun's shine completely.

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Answer:

D

Explanation:

Explanation:

Answer:

D. deciduous forest.

Explanation:

This biome is named for the dominant trees that drop their leaves during the winter months.

Answer:

A

Explanation:      ATP molecule  stores energy chemically in the form of highly strained bonds.

ATP synthase: An important enzyme that provides energy for the cell to use through the synthesis of adenosine triphosphate (ATP). during chemical process

ATP is the molecule through which cells store and release energy for their various processes. It acts as the energy currency of the cell, with energy released upon its conversion to ADP. This energy is utilized by the cell for performing work and maintaining homeostasis.

The molecule used by cells to store and release the energy needed to power cellular processes is Adenosine Triphosphate (ATP). ATP is often referred to as the 'energy currency' of the cell because it provides the energy for most of the energy-consuming activities within the cell. It functions as the energy currency by allowing cells to store energy briefly. The energy released by the hydrolysis of ATP can be used for cellular work, such as muscle contraction or driving endergonic chemical reactions by coupling them to ATP hydrolysis. When ATP is broken down into adenosine diphosphate (ADP) and a free phosphate group, energy is released. This energy is immediately available for cellular processes.

In the context of cellular respiration, ATP is the primary molecule that stores the energy released. During glycolysis, for example, the energy derived from glucose catabolism is used to recharge ADP into ATP. Comparatively, ATP stores smaller quantities of energy but in a form that is readily usable by cells, unlike molecules like glucose which store energy long-term but require conversion into ATP for immediate use.

Overall, ATP's role is critical in the function and regulation of many biochemical pathways, and it holds the energy that is required for vital cellular and bodily functions.

Answer:

D) Iron compounds are a catalyst for the decomposition of hydrogen peroxide.

Explanation:

The reaction of descomposition of hydrogen peroxide (H₂O₂) to produce oxygen (O₂) is:

2H₂O₂ → 2H₂O + O₂

Based on the data of potential catalys effects on reaction rate:

A) Iron compounds are always used as catalysts.  FALSE. It is possible to know that, for this reaction, iron compounds are acting as catalyst but there is no information about all reactions to know that iron compounds are always catalysy

B) Reaction rate is always increased by iron compounds.  FALSE. Again, for this reaction iron compounds increases reaction rate but it is not possible to know that reaction rate is always increased by iron compounds.

C) Increasing the temperature increases the rate of decomposition.  FALSE. There is no information about temperature of reaction.

D) Iron compounds are a catalyst for the decomposition of hydrogen peroxide. TRUE. As both iron compounds increases the rate of reaction, it is possible to say that iron compounds are a catalyst for the descomposition of hydrogen peroxide.

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Answer:

D

Explanation:

According to the experimental data, iron compounds are a catalyst for the decomposition of hydrogen peroxide. Both test tubes with H2O2 plus Fe(III) compounds show an increase in oxygen production, which in turn indicates an increase in the rate of reaction. There is no temperature variable in this experiment.

Answer:

We reduce the size of the cell

and increase surface area to volume ratio.

Explanation:

Answer:

Some idea of the value or merit of an idea (or a solution to a problem) can be discovered by the degree to which it fulfills some or all of the following criteria, as appropriate.

Explanation:

The solution achieves the stated goals, meets a need well.

"It works."

"That does it."

"Problem solved."

"That's perfect."

The criteria that should be used when evaluating competing solutions and the degree to which an idea (or problem-solving approach) is implemented can give us some insight into its worth or merit.

A program, practice, intervention, or initiative can be studied scientifically through evaluation to determine how well it achieves its objectives. Evaluations assist in identifying the aspects of a program or initiative that are effective and could be improved.

English definition of evaluation is the act of evaluating or determining the standard, significance, quantity, or worth of something: It will be necessary to wait until all the data has been gathered before evaluating this new treatment.

Therefore, we can gain some understanding of an idea's worth or merit by considering the standards that should be applied when comparing competing solutions and the extent to which a problem-solving strategy is put into practice.

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Answer:

215,500

Explanation:

i hope this helps

Answer:

Primary succession can be described as the development of a community in an area where there was no form of life before. For example, an area where volcanic eruption might have occurred.

Secondary succession can be described as an ecological succession which occurs in areas where the previous community had been destroyed by some kind of environmental disaster or human activity like fire etc.

As secondary succession occurs in areas where there was life before that means that the soil of this area will still have essential minerals and nutrients which will support life better as compared to areas of primary succession. In primary succession, the area might not even have soil. The rocks will be converted to soil in these area which will take a lot of time. Hence, an area that goes through secondary succession will likely reach its climax community before an area that goes through primary succession.

Answer:

The answer that they gave was

"An area going through secondary succession reaches its climax community faster because the area begins with some soil and some plant and animal species. An area that goes through primary succession, on the other hand, begins with no soil and no organisms, so reaching the climax community takes longer."

Explanation: