What do scientists hypothesize about production of free oxygen

Answers

Answer 1
Oxygen in the form of the oxygen molecule (O2), produced by plants and vital for animals, is abundant in Earth's atmosphere and oceans. ... But at some point, Earth underwent what scientists call the Great Oxidation Event or GOE for short, as ocean microbes evolved to produce O2 via photosynthesis.

Related Questions

Explain mutations and how they can cause genetic disease

Answers

Answer:

A mutation is a change in a DNA sequence. Mutations can result from DNA copying mistakes made during cell division, exposure to ionizing radiation, exposure to chemicals
called mutagens, or infection by viruses. Germ line mutations occur in the eggs and sperm and can be passed on to offspring, while somatic mutations occur in body cells and are not passed on.

Mutation has been the source of many Hollywood movies, but it's really a simple process of a mistake made in a DNA sequence as it's being copied. Some of that's just the background noise that DNA copying is not perfect, and we should be glad of that or evolution couldn't operate. But mutation can also be induced by things like radiation or carcinogens in a way that can increase the risk of cancers or birth defects. But it's pretty simple; it's basically an induced misspelling of the DNA sequence.
That's a mutation.


When a variant alters a protein that plays a critical role in the body, it can disrupt normal development or cause a health condition. A condition caused by variants in one or more genes is called a genetic disorder. In some cases, gene variants are so severe that they prevent an embryo from surviving until birth.

5. Identify Patterns To analyze the characteristics of life, why is it useful to identify
patterns at the level of molecules and cells?
NOTEBOOK

Answers

334333till cdftgj vnnnmm

Which of the following types of compounds is unlike the other three?
A-wax
B-saturated fat
C-phospholipid
D-polysaccharide

Answers

Answer:

D-polysaccharide

Explanation:

A polysaccharide is a carbohydrate while the others have to do with lipids.

Mitosis undergoes 4 stages. PICK ONE stage and outline what happens in this stage?

Answers

Prophase;
nucleolus disappears
nuclear membrane disintegrates
chromatids shorten and thicken and appear to lie side by side in pairs, joined by a centromere.
centrioles migrate to opposite poles
spindle fibers begin to form.

During Anaerobic respiration:
A. glucose is converted into Lactic Acid.
B. glucose is converted into ATP.
C. ATP is converted into Lactic Acid.
D. glucose is not used as the energy source, since there is no oxygen.

Answers

The answer is A as during anaerobic respiration, as there is no oxygen, glucose is converted into ethanol and lactic acid to produce some energy.

During the process of anaerobic respiration, glucose is converted to lactic acid in the absence of oxygen. So the correct option is A.

What is anaerobic respiration?

The type of respiration in which the sugars are broken down in the absence of oxygen. Here the final electron acceptor is not oxygen. The organisms that perform anaerobic respiration have evolved to use other substances as their electron acceptors.

Aerobic respiration happens in presence of oxygen. In both of these types of respiration, glucose is broken down into pyruvate and then it enters a series of reactions using an electron transport chain to produce ATP. This is where they require a final electron acceptor which can be oxygen, nitrate or sulfates etc.

The process of breakdown of glucose is called glycolysis. and after that two pyruvate molecules are produced. In anaerobic respiration, these molecules undergo reactions in the cytoplasm to produce ATP with the help of sulphur, sulfates, nitrates, fumarates etc as the final electron acceptor.

Anaerobic respiration produces less ATP compared to aerobic repiration.

Read more about Anaerobic respiration, here

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Organisms need ?to conduct essential life activities

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Explanation: Living organisms must take in *energy* via food, nutrients, or sunlight in order to carry out cellular processes. The transport, synthesis, and breakdown of nutrients and molecules in a cell require the use of energy. hope this help!!

Answer:

im pretty sure the answer is cells.

If a red fox, sage shrub, fence lizard, and grasshopper were arranged which one has the least amount of energy

Answers

Sage shrub (I'm so sorry if it's wrong)

Explanation:

Sage shrub >>> grasshopper>>>fence lizard>>>red fox

How is the DNA described and what does this mean ?

Answers

Answer:

DNA stands for deoxyribonucleic acid, which is a molecule that contains the instructions an organism needs to develop, live and reproduce. These instructions are found inside every cell and are passed down from parents to their offspring.

Answer:

DNA is made up of molecules called nucleotides each nucleotide contains a phosphate group, a sugar group and a nitrogen base. the four types of nitrogen bases are adenine (A), thymine (T), guanine (G), and cytosine (C). Deoxyribonucleic acid or DNA is a molecule that contains the instructions an organism needs to develop, live and reproduce. These instructions are found inside every cell, and are passed down from parents to their children.

13. Think of a concept that might be easier to understand or explain by making a model. Identify the
concept, and explain why a model would be useful.

Answers

A concept that is easier to understand using a model is the atomic structure.

The atom is the smallest particle of a substance that can take part in chemical reaction. All substances are made up of atoms but these atoms are not visible to the naked eyes.

The concept of atomic structure lies at the base of understanding science. Hence, a science student must thoroughly comprehend this concept.

Since atoms can not be seen with naked eyes, it is imperative to use a model to aid the learner in conceptualizing the structure of atoms.

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What is the named the system of measurement use by most countries around world?

Answers

The correct answer is metric

Which statement associated with mosquito helps understand that malaria is a
communicable disease?
(a) The causative agent of malaria is a protozoan.
(b) The mosquito carriers the parasite Plasmodium that causes malaria.
(c) The mosquito lays its eggs in water collected in tyres, coolers, and open pits.
(d) The parasite is transferred inside the body of a health person along with the
mosquito bite.

Answers

Answer:

(d) The parasite is transferred inside the body of a healthy person along with the mosquito bite.

In what layer of the epidermis does mitosis
occur?

Answers

Answer:

Mitosis occurs in the deepest layer of the epidermis, which is called the stratum basale.

Pepsin and Trypsin are enzymes. At what pH do they have the highest rate of reaction?

Answers

Answer:

It has an optimum pH of about 1.5. Trypsin's optimum pH is about 8.

Explanation:

This active trypsin acts with the other two principal digestive proteinases — pepsin and chymotrypsin — to break down dietary protein into peptides and amino acids. These amino acids are essential for muscle growth, hormone production and other important bodily functions.

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HELP ME 40 POINTS!!!
1.A single statement that describes the purpose or reason for conducting an 1 point
experiment without making a prediction.
2. The word simply states that the results obtained were due to chance and not the independent variable that the researcher changed or the situation that they engineered
3. This is a statement predicting the direction of a relationship between variables
4 it predicts the findings of study

Answers

To determine what sort of data table will be most useful or The purpose of an experiment is to test a hypothesis at least that's what i know.  I do think "3. This is a statement predicting the direction of a relationship between variables" Is the right ansswer. Sorry if i'm wrong. :c

Neon is a colorless gas that is not known to reach with any other substance. Which other element is most likely to be a nonreactive gas?
A. Xe, number 54
B. F, number 9
C. Cs, number 55
D. Na number 11

Answers

Xenon is a noble gas. As it has a full valence (outer) shell, it is usually inert (unreactive)

What would happen if there are no villi in the walls of the small intestine? (a) Less surface area will be available so it will not absorb required amount of nutrients for the body (b) More surface area will be available so it will not absorb required amount of nutrients for the body (c) Less surface area will be available so it will absorb required amount of nutrients for the body (d) None of these

Answers

Answer:

(a) Less surface area will be available so it will not absorb required amount of nutrients for the body

Explanation:

Hope it helps :)

How is the energy stored in ATP released?
A.) ATP bonds with oxygen atoms
B.) Breaking the chemical bond between the 1st and 2nd phosphate
C.) Breaking the chemical bond between the 2nd and 3rd phosphate
D.) The energy in an ATP molecule doesn’t need to be “released”

Answers

Answer:

When the cell needs energy to do work, ATP loses its 3rd phosphate group, releasing energy stored in the bond that the cell can use to do work

Which of the following would not be facilitated diffusion?
A: A water molecule passes through a semi permeable membrane
B: A large glucose molecule enters the cell through a pore protein
C: An amino acid exit the cell through an integral protein
D: A chlorine ion (CI-) unlocks a protein channel, and passes through

Answers

Answer:

A. A water molecule passes through a semi permeable membrane

Explanation:

Facilitated diffusion is the diffusion of a molecule without any assistance from a protein or protein channel.

In facilitated diffusion, a molecule will diffuse by itself through a semi permeable membrane, such as the cell membrane.

Answer choices B, C, and D are incorrect because they are all examples of facilitated diffusion. The molecules required assistance from a protein.

Answer choice A is correct because the water molecule was able to pass through by itself.

So, the correct answer is A. A water molecule passes through a semi permeable membrane

Which tree harvesting method removes whole trees in rows in several cuttings over several years?
seed-tree cutting
shelterwood cutting
strip logging
whole-tree harvesting

Answers

Answer:

shelter wood cutting is the answer

Explanation:

hope it may help you

is a biosphere is smaller than anecosystem.​

Answers

Answer:

Yes!

Explanation:

From largest to smallest: biosphere, biome, ecosystem, community, population, and organism. Hope I helped :)

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The biosphere is made up of the parts or Earth where life exists. The biosphere extends from the deepest root systems of trees to the dark environment of ocean trenches, to lush rain forest and high mountaintops

A new video game manufacturer has claimed to make an entertaining action games that can improve your vision

Answers

Answer:

The video game manufacturer will have to provide evidence to support their findings. If you wanted to test their claim, first write a null and alternate hypothesis and do tests that provide data that can either reject or fail to reject the null hypothesis

Explanation:

jelaskan bagaimana cara kerja pengawet dalam mengawetkan makanan.

Answers

i really like the gibberish

5 example of balanced and 5 example of unbalanced​

Answers

Answer:

I think you asked for balanced and unbalanced chemical equations. your answer is in the attachment !

I'm not sure if you're talking about forces or not, but ill answer anyways.

Balanced Forces:

A person standing/sitting stillAn object floating in the waterPicture frames on a wallA jacket hanging on a coat rackA tug of war game where neither side is winning

Unbalanced Forces:

A car acceleratingAn object sinking in waterAn object getting knocked over by the windA fruit dropping from a treeRiding a skateboard

How is reproduction different than the other five characteristics of living cells?

Answers

Answer:

because reproduction is nature gifted and it is the way to increase population but living cells are the cells which keeps us alive

Reproduction differs from the other five characteristics of living cells because of the ability to replicate for continued existence.

The characteristics of living things include -MR NIGER D(acronym to remember)

Movement RespirationNutritionIrritabilityGrowthExcretionReproductionDeath

Now Reproduction differs from all the others because while others are processes that organisms need for existence or survival,Reproduction on the other hand is the reason for the continuation of existence of species(creation of a copy).  

Without reproduction,  Living organisms would go extinct and  would not be able to replicate themselves .

See related answer here:  https://brainly.com/question/318637

Tides occur in ocean,why?

Answers

Answer:

¿Qué Causa las Mareas? Podemos decir de una manera sencilla que las fuerzas de atracción que tanto el sol como la luna ejercen sobre la tierra, permiten una deformación y consecuente movimiento de las masas de agua de mares y océanos; esto hace que los niveles de agua suban y se formen las mareas.NOTA: Aquí anexo la respuesta en ingles.What Causes the Tides? We can say in a simple way that the attractive forces that both the sun and the moon exert on the earth, allow a deformation and consequent movement of the water masses of the seas and oceans; This causes the water levels to rise and tides to form.

Hello i need help with this it’s just short (The subject is science and Im sorry if i got the subject wrong from the above) Thank you in advance <3

1. Forest ecosystems provide all of the following functions EXCEPT;

a. producing oxygen
b. controlling soil erosion
c. removing carbon from the atmosphere
d. lowering the biodiversity of the plant

2. Extinction is a natural process that occurs when the last member of a species does. Which of the following correctly arranges the mass extinction events from earliest to latest?

a. Cretaceous-Tertiary, Ordovician-Silurian, Late Devonian, Permian-Triassic, Triassic-Jurassic

b. Late Devonian, Cretaceous-Tertiary, Ordovician-Silurian, Permian-Triassic, Triassic-Jurassic

c. Ordovician-Silurian, Late Devonian, Permian-Triassic, Triassic-Jurassic, Cretaceous-Tertiary

d. Ordovician-Silurian, Permian-Triassic, Triassic-Jurassic, Late Devonian, Cretaceous-Tertiary

3. Which contributes the most biodiversity loss?

a. habitat destruction b. pollution
c. invasive species d. population growth

4. Extinction can be caused by a Natural Phenomenon such as storm, flash floods, or Anthropogenic (Human made). Which of the following is believed to be the major and most impactful anthropogenic cause of extinction?

a. habitat destruction b. overpopulation
c. overexploitation d. pollution

5. Which of the following is not a benefit that tress can provide?

a. They can trap sediments and runoffs that help improve water quality.
b. They prevent the excessive warming of the planet by sequestering Carbon dioxide.
c. They serve as filters that rid the air of harmful pollutants and toxic gases.
d. None of the above.

Answers

Answer:

1. Lowering Biodiversity of the plant

2. I think it is B

3. Habitat Destruction

5. None of the Above

Explanation:

Answer:

1. d

2.c

3.a

4.a

5.d

Explanation:

1. Forests ecosystem have high biodiversity

3.Habitat loss from exploitation of resources, agricultural conversion, and urbanization is the largest factor contributing to the loss of biodiversity. The consequent fragmentation of habitat results in small isolated patches of land that cannot maintain populations of species into the future.

4.It is currently the biggest cause of current extinctions. Deforestation has killed off more species than we can count.

5. Im not sure.

   It may be ans c. As Trees absorb  toxic chemicals through their stomata, or 'pores', effectively filtering chemicals from the air.

How are disaccharides formed?

Answers

Person above me seems smart

Assertion : Parenchyma cells help in storage of food. Reason : Parenchyma cells are the main seats of photosynthesis.

Answers

Answer:

Assertion and reason are true and reason is the correct explanation of assertion

In which region of the Earth's interior does the heat increase to the point that rocks can begin to melt?

A. stratosphere
B. asthenosphere
C. magnetosphere
D. lithosphere​

Answers

Answer:B

Explanation:The asthenosphere is the denser, weaker layer beneath the lithospheric mantle. It lies between about 100 kilometers (62 miles) and 410 kilometers (255 miles) beneath Earth's surface. The temperature and pressure of the asthenosphere are so high that rocks soften and partly melt, becoming semi-molten.

How does an mRNA strand reach the site for Translation?
A. It moves across the membrane through Active Transport
B. It exits the Nucleus through a Nuclear Pore
C. It is already where it needs to be, Translation occurs as soon as the mRNA is processed
D. A tRNA molecule carries it to the Ribosome

Answers

The strand of mRNA passes from the A to the P sites of the ribosome before exiting at the E site. At the A site, tRNA molecules connect to the codons of mRNA before moving to the P site, where their amino acid is added to the growing polypeptide chain.

The correct answer is B: it exits the nucleus through a nuclear pore.
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Likewise, his wife, Martha Washington, could also be considered the "Mother of America," as demonstrated by her roles as the general's wife and the first lady.During the American Revolution, Martha Washington earned the title of "Mother of America" for her caring nature as the general's wife. She was also very brave. Despite the danger of kidnapping, Martha refused to abandon her home, Mount Vernon, in Virginia. When Martha did leave the plantation for periods of time, she traveled to the military camps where Washington was staying. First, Martha had to be vaccinated so that she would not suffer from smallpox. Once she was inoculated, Martha made the risky trip to camp. British and American soldiers roamed the countryside, and capture was a real possibility. Nevertheless, Martha arrived at each winter camp. She acted as confidant and secretary to George Washington, who believed that her presence was crucial. She encouraged the soldiers, helped their wives, and comforted those who were wounded. One of her key roles was also to entertain important visitors to the camp. Occasionally, Martha Washington even represented George at events he could not attend. Martha used her position to contribute to fundraising efforts for military supplies in 1780 and knit socks for the soldiers herself. Overall, her care and attention to others' needs made her the "Mother of America" during the American Revolution.What evidence does the author use to support the idea that Martha Washington should be considered the "Mother of America"?A. British and American soldiers roamed the countryside, and capture was a real possibility. it is not B.C. First, Martha had to be vaccinated so that she would not suffer from smallpox.D. She encouraged the soldiers, helped their wives, and comforted those who were wounded. 15. Identify the two groups that struggled for power in Rome. Pls help meee! (I put the questions of the picture) 13. "Are you going to the cinema?" he asked me. He asked me that if I A pole that is 2.8 m tall casts a shadow that is 1.46 m long. At the same time, a nearby building casts a shadow that is 50.25 m long. How tall is the building?Round your answer to the nearest meter. Which advancement led to the agricultural revolution?the decrease in the Earths temperaturethe increase in hunting and gatheringthe long-distance trade of goodsthe domestication of plants and animals Tony advertises a 2014 Honda Civic car for sale at $12,999 on a website known as Koala Car Sales. Mike reads the advertisement. He is interested and so calls Tony. Tony invites him to inspect the car, giving him the address. After inspecting the car, Mike says I will give you $7,000 for this car. Tony responds, Thats no good. I would want at least $10,000 as those tyres and rims are worth $4,500. Mike replies, Sorry mate but it isnt worth that much to me. Three weeks later Mike sees the same advertisement on the same website but this time selling the car for $10,500. Mike phones Tony and say I would be prepared to pay $5,500. Tony laughs and says How about we go back to your original price of $7,000. We have a deal. Discuss the legal effect of each communication and determine if an agreement was formed. Assuming there was an agreement reached between Tony and Mike, discuss whether it would be supported by the necessary intention and consideration to be recognised as a contract. What type of evidence is needed for a hypothesis to be supported or not supported?O demonstrative evidenceO observational evidenceO physical evidenceO circumstantial evidence 1. The sum of 6 times a number n and 4 times a number n is -30. What is the number?2. Four less than the product of 6 and a number n is -30. What is the number? _____3. Four less than the product of 6 and a number n is -30. 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