PLEASE HELP!!!! Which of the following were responsible for changing the oxygen content in
Earth's atmosphere from no oxygen to 21% oxygen?
A. Prokaryotes
B. Eukaryotes
C. Ribozymes
D. Protobionts

Answers

Answer 1

Im not 100% sure but the best answer I can give is Prokaryotes because they came to be around the time oxygen did as well.

Answer 2

Answer:

prokaryotes

Explanation:

i took the quiz


Related Questions

the region adjacent to the c-end of the inner gate in transient receptor potential melastatin 8 (trpm8) channels plays a central role in allosteric channel activation

Answers

8 cend of the ineeer 8 trpm activationnn

What does Letter "A" represent in the water cycle? *


HELP ASAP

Answers

Answer:

Air, Atmosphere?

Explanation:

Which of the following statements are true about meiosis II?
Choose 2 answers:

(Choice A)
A
It results in the formation of two haploids (n) cells.

(Choice B)
B
It results in the formation of four haploid (n) gametes.

(Choice C)
C
Its goal is to separate homologous pairs of chromosomes.

(Choice D)
D
Its goal is to separate sister chromatids.

Answers

Answer:

B & D

Explanation:

Please mark me brainliest

What would cause a person’s eye color to change from blue to green while that person was a child?

Answers

Answer:

Gray eyes may be called “blue” at first glance, but they tend to have flecks of gold and brown. And they may appear to “change color” from gray to blue to green depending on clothing, lighting, and mood (which may change the size of the pupil, compressing the colors of the iris

Explain the structure of a chromosome (please)

Answers

Answer:

Chromosome structure consists of a long arm region and a short arm region connected at a central region known as a centromere. The ends of a chromosome are called telomeres. Duplicated or replicated chromosomes have the familiar X-shape and are composed of identical sister chromatids.

Explanation:

Which of the following is a law?
A. an idea which cannot be disproven
B. an idea which has been disproven
C. an idea which has not yet been disproven
D. an idea that is supposed to be disproven

Answers

Answer:

C

Explanation:

What two enthalpic factors stabilize dna in double-helical form at low temperature?.

Answers

The answer is Hydrogen bonding between purine and pyrimidine rings in each base pair

What is a major difference between Animalia and Plantar kingdoms

Answers

Answer:

Plantar: The cells of this kingdom contain cell wall.Plants don't have any locomotion.

Animalia: Animal cells do not have any cell walls. Animals have locomotion and they can move from one place to another.

Stories involving celebrities are more newsworthy than similar stories involving regular individuals.
А.
True
B.
False

Answers

Answer:

true

Explanation:

Answer:

B. False

Explanation:

help? giving 25 points

Answers

Answer:

% Normal chin (NN) - 25%

% Normal chin (Nn) - 50%

Explanation:

Create a punnett square using Nn and Nn. Since both mom and dad have a dominant trait, but carries that recessive trait, it is considered "Nn".

N n x N n = NN, Nn, Nn, nn

% Normal chin (NN) - 25%

% Normal chin (Nn) - 50%

% Abnormal chin (nn) - 25%

During which phase of the moon do neap tides occur? full gibbous new quarter

Answers

Answer:

The answer is D

Explanation:

The neap tides occur during a phase of the moon called the quarter phases, This is further explained below, Option D is correct.

To find the tides we need to know more about the phases of the moon

What are the phases of the moon?

The new moon, first quarter, full moon, and last quarter are the four main lunar phases, which occur when the Moon's ecliptic longitude is at an angle to the Sun.

In conclusion, The phase of the moon  neap tides occur is called the quarter

Read more about Environment

https://brainly.com/question/17413226

Why is photosynthesis so important to living organisms?
Most consumers can convert energy into food, but they can’t make enough of it, so they need producers, too.
Consumers do not usually live in areas where they can get energy, so they have to eat producers to get enough energy.
All living organisms need energy to stay alive, but only producers can directly convert energy into food.
Decomposers take so long to recycle dead and decaying matter that producers have to make up the difference.

Answers

Answer:

All living organisms need energy to stay alive, but only producers can directly convert energy into food.

Explanation:

The process of photosynthesis is very important because all living organisms need energy to stay alive, but only producers can directly convert energy into food.

Photosynthesis is the process whereby green plants manufacture their food in the presence of carbon dioxide and water.

They take light energy from the sun and produce food materials. The light energy is converted to chemical energy which are stored in carbon chains as glucose. The  chemical energy is then used by other living organisms for their own nourishment.

What is the advantage of genetic connections and disadvantage

Answers

Answer:

A sense of relief from uncertainty.

it reduced the risk of cancer

What is a characteristic that helps a living thing survive and
reproduce in a given environment called?

Answers

Answer: An adapation

Explanation:

Islands are home to many of the world's rare species. Which of the following factors contributes most
to this situation?

a small land area
b. geographic isolation
C. limited food source
d fewer predators

Answers

Answer:

b geographic isolation

Why is the decomposing web important

Answers

Decomposition of organic matter (i.e. dead plant and animal remains) in soils is an important process in any ecosystem. As organic matter is decomposed, water, carbon dioxide and nutrients are released

Pick only ONE sentence Which sentence from the section shows why the right temperature is important for plants? (A) Temperature can also affect a plant (B) As with any living thing, a plant has an optimal temperature range at which it grows and preforms best (C) It may not be able to take in enough water and nutrients through it's roots (D) Too much heat can cause plant cells to break down, a process called denaturation.

Answers

Answer:

The correct answer is - (B) As with any living thing, a plant has an optimal temperature range at which it grows and performs best.

Explanation:

Like any other or most of the living organism, plants also required an optimal temperature range as they also required appropriate temperature for their growth and development and perform their functions at their best.

Optimum temperature range is a temperature range at which something performs its best similarly plants perform their cellular functions like photosynthesis, metabolism, reproduction, and many other functions that require a particular temperature range.

20 points :)

How does the flame cell function in a planarian?
Select one:
a. Carbon dioxide is excreted by them through the mouth.
b. Cilia sweep water into excretory tubules.
c. Cilia sweep water out of the body.
d. Dissolved oxygen and nutrients are swept into the body by diffusion.

Answers

D
This is because it executed out and in and it makes the cell function crazy

Answer:

Cilia sweep water into excretory tubules.

Explanation:

It function like a kidney, removing waste materials through filtration.

Hope it helps!

Question 33
The recent increase in global temperature that is promoting a greenhouse effect is primarily due to
А
an increase in solar activity
B
volcanic eruptions
С
an increase in forest area
D
the burning of fossil fuels

Answers

D

by process if elimination

HELP PLS!!!If carbon dioxide is completely removed from a plant’s environment, what would you expect to happen to the plant’s production of high-energy sugars?

Answers

Answer:

More sugars will be produced. ... Carbon dioxide does not affect the production of high-energy sugars in plants.

Explanation:

as the lumbar and sacral nerves extend inferiorly beyond the end of the spinal cord, they form the .

Answers

The lumbar and sacral nerves extend inferiorly beyond the end of the spinal cord, they form the Cauda Equina.

What is Cauda Equina?

The cauda equina, a group of nerves near the end of the spinal cord, is so named because it resembles a horse's tail. The top part of the lumbar (lower back) spine is where the spinal cord terminates.

The separate nerve roots that provide the legs and bladder with motor and sensory function continue along the spinal canal at the spinal cord's extremity. These nerve roots continue in the lumbar and sacral region as the cauda equina. These nerves carry signals to and from the pelvic organs and lower limbs.

Cauda equina syndrome (CES) occurs when there is dysfunction of multiple lumbar and sacral nerve roots of the cauda equina.

To learn more about Cauda Equina visit the link:

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A plant absorbs minerals from the soil. This is an example of

A. Digestion
B. Circulation
C. Nutrition
D. Growth​

Answers

Answer:

C

Explanation:

If a red fur male is crossed with a brown fur female, what percent of the offspring would have the genotype

Answers

Answer:

If the brown male had been BB, then all offspring would have been Bb and all brown. However, if the male is Bb as above and you perform a testcross, 50% of all offspring should have the bb genotype and a white phenotype. A testcross to a heterozygous individual should always yield about a 1:1 ratio of the dominant to recessive phenotype. So, both the genotypic and phenotypic ratios

Explanation:

systematically assessing natural compounds’ wound healing potential with spheroid and scratch assays

Answers

Systematically assessing wound healing assay is a laboratory technique that is used to study the cell migration and the cell to cell interaction.

This wound healing assay is also known as scratch assay because it is done by the doing a scratch on a cell monolayer and by capturing a image on regular intervals by time to time.

This wound healing is of 4 stages and that are homeostasis, inflammation, proliferation and remodeling.

Homeostasis is the self regulating process in which the organisms try to maintain stability.

To learn more about homeostasis here

brainly.com/question/3888340

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The questions are in the pic, they are about gravity :)

Answers

2. Because the gravitational force from anything that small compared to a planet is so minuscule it's nearly impossible to feel or measure.

3. Because do not have life and other processes necessary to create the gasses and substances necessary to create an atmosphere.

4. If the amount of mass lost was large enough it would likely allow the moon to eventually orbit away

- What is the role of mRNA in expressing specialized structures?
F Making energy available for cellular activities
G Creating bonds to form biomolecules
H Producing sugars that assist with replication
J
Providing information to form proteins

Answers

Answer:J providing information to form proteins

Explanation:

The role of mRNA in expressing specialized structures is providing information to form protein. The correct option is J.

What is mRNA?

Messenger ribonucleic acid is a single-stranded RNA molecule that equates to a gene's nucleotide makeup and is read by a ribosome during the protein polymerization reaction.

The function of mRNA is to transport protein details from the nucleus of a cell to the cytoplasm.

Here the protein-making equipment likes to read the mRNA sequence as well as translates each three-base codon into the corresponding amino acid in a burgeoning protein chain.

Messenger RNAs are single-stranded molecules that move genetic information from the nucleus to the cytoplasm, in which proteins are sequenced.

Thus, the correct option is J.

For more details regarding mRNA, visit:

https://brainly.com/question/22664176

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Plant cells contain organelles called ___. Filled with chlorophyll, they ___ radiant energy.

Answers

Answer: Plant cells contain organelles called chloroplasts. Filled with chlorophyll, they absorb radiant energy.

I hope this helps!

Answer:

chloraplasts; absorb

Explanation:

It's all part of photosynthisis.

which is the best advice you and from whom?share.​

Answers

Answer:

u  should s#x more often

Explanation:

SOMEONE PLEASE HELP T-T

Research and find a current map of the ocean floor. Considering only a small
portion has currently been mapped, what do you think new maps will look
like? What do you think will be found in the future? Explain your answer below.


Answers

Answer:

the new maps will have mountain like ridges and ravines. in the future scientists will find new animals and plants as they go deeper into the sea

I need help and listen I will give you Brainliest just answer this question and read it twice because I really need help and so help me God if you don't answer this question fully I will report you and you will get banned for life so answer this question fully!!

Answers

Answer:

The heart consists of four chambers organized into two pumps (right and left) for the purpose of providing blood flow to the systemic and pulmonary circulations. The right atrium receives deoxygenated blood from the entire body except for the lungs via the superior and inferior vena cavae!

The heart has four chambers: two atria and two ventricles.

The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle.

The right ventricle pumps the oxygen-poor blood to the lungs.

The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle.

The left ventricle pumps the oxygen-rich blood to the body.

Hope this helps!

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In both cases, an extremely powerful country was fighting thousands of miles from home against a relatively small native army, which was supported and supplied by a third country. In the case of the Revolution, France was the third country; in the case of Vietnam, it was the Soviet Union. Just as the British, with their command of the sea, could land troops wherever they wished on the Atlantic coast, so could the United States, with its air superiority, airlift troops wherever it wished in Vietnam. Both wars were extremely unpopular at home. But the most striking of the resemblances between the two is that while both great powers often defeated their enemies in large battles, neither was eventually able to win the war. Which word is NOT a clue to the pattern of organization of the paragraph? Question 7 options: Resemblances But Both Just as Question 8 (0.5 points) Revolution and the Vietnam War. In both cases, an extremely powerful country was fighting thousands of miles from home against a relatively small native army, which was supported and supplied by a third country. In the case of the Revolution, France was the third country; in the case of Vietnam, it was the Soviet Union. Just as the British, with their command of the sea, could land troops wherever they wished on the Atlantic coast, so could the United States, with its air superiority, airlift troops wherever it wished in Vietnam. Both wars were extremely unpopular at home. But the most striking of the resemblances between the two is that while both great powers often defeated their enemies in large battles, neither was eventually able to win the war. The main pattern of organization in the above paragraph is: Question 5 options: Contrast Cause and effect Definition and example Comparison Write an inequality that represents the graph. An inequality that represents the graph is -1 on a number line a . 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The sound pulse you produce has no definite frequency and no wavelength. The sound you hear reflected from the bleachers has an identifiable frequency and may remind you of a short toot on a trumpet, buzzer, or kazoo.(a) Explain what accounts for this sound. Compute order-of-magnitude estimates for Aiden surveyed 300 of the students in his school about their favorite color. 85% said their favorite color was red. How many students favorite color was red? Which of the following makes the varied types of digital communication possible?an agreed-upon set of rules and standards governing the way technology shares and manages dataproperly linking all of the workstations on a closed loop-like configurationrefraining from relying too heavily on one central hub that connects all nodes on a systemonly using a high-quality server computer with lots of memory