Please Help, this is for a Unit Test

question 1: What accounts for the significant increase in oxygen in earth's atmosphere 2 to 2. 5 billion years ago,?


A. Living organisms

B. Volcanic outgassing

C. Condensation

D. Chemical reactions in the atmosphere

Answers

Answer 1
A - Livinf organisms

Related Questions

Among the invertebrate phyla, phylum arthropoda is unique in possessing members that have.

Answers

Answer:

Wings

Explanation:

The most unique feature among phylum Arthropoda is that some of its members have wings. No other invertebrate has winged species!

PLEASE HELP
Why is cellulose important for explaining how carbon atoms get "locked up" (stored) in a tree as long as it is alive?

O Cellulose is what is produced in photosynthesis.

O Cellulose is used to make new cell walls, when tree cells divide, which become part of the tree.

O Cellulose is made up of CO2 molecules from the atmosphere that stay in the tree.

O Cellulose is what the trees use to make starch, which stores energy for the tree to use later.

Answers

Cellulose is a very common organic chemical compound in the plant kingdom and is made up of CO2 molecules from the atmosphere that stay in the tree.

What is cellulose?

It is a biopolymer, that is, a long chain of carbohydrates, composed exclusively of glucose molecules (β-glucose) linked together by hydrogen bonds.

It is synthesized by the photosynthesis of plants and whose main function in plant tissues is support, that is, it is part of the cell wall of plant cells.

Therefore, we can conclude that cellulose is a very common organic chemical compound in the plant kingdom and is made up of CO2 molecules from the atmosphere that stay in the tree.

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Expected frequency of CC genotype

Answers

0.01 is the expected frequency

Answer:

0.18

Explanation:

During which phase of the cell cycle does the cytoplasm of a cell divide to form two daughter cells?.

Answers

Answer:

Telophase or in other words the final phase of mitosis

Explanation:

If a population is already well-adapted to its environment, will most mutations be helpful or harmful? Explain.

Answers

Most mutations will be helpful if a population is already well-adapted to its environment.

What is Mutation?

This is defined as a change in the DNA sequence of organisms. These changes occur as a result of the ever changing environmental conditions.

When there is a high adaptability by the population, then it infers that the mutation is a helpful one.

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What kind of compounds are formed by carbon​

Answers

Answer:

Carbides: Carbides are binary compounds formed by carbon and another element with a lower electronegativity. Examples include Al 4 C 3, CaC 2, SiC, TiC, WC.

Carbon Halides: Carbon halides consist of carbon bonded to a halogen. Examples include carbon tetrachloride (CCl 4) and carbon tetraiodide (CI 4 ).

Carboranes: Carboranes are molecular clusters that contain both carbon and boron atoms. An example is H 2 C 2 B 10 H 10.

Explanation:

Answer:

Carbon Forms Covalent Bonds

This is because carbon typically bonds with elements which have a similar electronegativity. Examples of covalent bonds formed by carbon include carbon-carbon, Examples of compounds containing these bonds include methane, water, and carbon dioxide.

Explanation:

Hope This helps

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~Zero~

The region of the stomach that empties into the duodenum is the.

Answers

Answer:

The pylorus

Explanation:

is the part of the stomach that connects to the small intestine. This region includes the pyloric sphincter, which is a thick ring of muscle that acts as a valve to control the emptying of stomach contents (chyme) into the duodenum (first part of the small intestine).

Answer:

The pylorus is the part of the stomach that connects to the small intestine. This region includes the pyloric sphincter, which is a thick ring of muscle that acts as a valve to control the emptying of stomach contents (chyme) into the duodenum (first part of the small intestine).

Explanation:

Hope i've helped you!!!

What is the difference between monocot and dicot cotyloden

and


What is rhe relationship between monocot seed and dicot seed​

Answers

Answer: The names of these groups are derived from the number of cotyledons or seed leaves that the embryonic seedling has within its seed. A monocot, which is an abbreviation for monocotyledon, will have only one cotyledon, and a dicot, or dicotyledon, will have two cotyledons.

Explanation:

Will the entire starch molecule be able to enter the cells of the digestive tract?

Answers

Answer:
To be put simply no,

Hope this helps :)

Particularly important dietary carbohydrates include starch and disaccharides such as lactose and sucrose. None of these molecules can be absorbed for the simple reason that they cannot cross cell membranes unaided and, unlike the situation for monosaccharides, there are no transporters to carry them across.

How can you determine the cell cycle stage of a plant cell?.

Answers

Answer:

based on measurement of cellular DNA content.

Explanation:

Photosynthesis is vital for maintaining levels of atmospheric oxygen. Please select the best answer from the choices provided T F.

Answers

Photosynthesis is able to keep the plant alive letting it make more oxygen. Answer is True

Photosynthesis is a key determining process to regulate the level of atmospheric oxygen. This statement is true.

What do you mean by Photosynthesis?

Photosynthesis may be defined as a process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.

Without the process of photosynthesis, the evolution of oxygen can not be imagined. Photosynthesis takes carbon dioxide from the atmosphere, and in respect of this oxygen is liberated in our surroundings.

Therefore, Photosynthesis is a key determining process to regulate the level of atmospheric oxygen.

To learn more about Photosynthesis, refer to the link:

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Why is the countercurrent system of flow important for fishes?

Answers

Question: Why is the countercurrent system of flow important for fishes?

Explanation and answer: Fishes use a design called 'countercurrent oxygen exchange' to maximize the amount of oxygen that their blood can pick up. They achieve this by maximizing the amount of time their blood is exposed to water that has a higher oxygen level, even as the blood takes on more oxygen.

             I hope this helped you a lot with your schoolwork.

                          I hope you have a wonderful week!

Monosaccharides disaccharides and polysaccharides are examples of:.

Answers

Answer:

Carbohydrates

Explanation:

the food you eat supplies you with the ____ needed for you rbody to build new cells and r enew itself

Answers

Nutrients
Hope it helps

why did mammals evolved so quickly after the extinction of the dinosaurs

Answers

Because they started breeding more started coming and there was no big threats

How did both the redi and the pasteur experiment prove there was no such thing as spontaneous generation

Answers

Answer:

These experiments proved that there was no spontaneous generation, since the boiled broth if never reexposed to air, remained sterile.

Nuclear-generated power plants are heavily subsidized. Do you think the market price of these plants should include the costs of the nuclear fuel cycle? Explain.



Answers

The market price of these plants should not include the costs of the nuclear fuel cycle.

What is a nuclear power plant?

A nuclear power plant is used in the generation of nucler power and offers a very cheap and relevant means of generating power though it is expensive to build. It also serves a lot of people as a veritable source of electricity.

The nuclear fuel cycle is cheap while the building of the palnt itself is expensive. Hence, the market price of these plants should not include the costs of the nuclear fuel cycle.

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Tay-sachs disease is caused by a mutation in the hexa gene located on chromosome 15. tay-sachs follows an autosomal recessive pattern of inheritance. with the help of the diagram, identify which of the offspring will be an unaffected carrier. a diagram showing the genes of parents who are carriers of tay-sachs disease a. a, b, and c b. b and c c. a and d d. a e. d

Answers

Tay-Sachs disease follows an autosomal recessive pattern of inheritance, so the unaffected carrier will be the child a.

The correct option is d, a.

What is Tay-Sachs disease?

Tay-Sachs is a neurodegenerative disorder, which causes the deficiency of an enzyme called hexosaminidase A.

The enzyme hexosaminidase A present in the lysosome helps in the digestion of fats.

This disorder causes the excess accumulation of lipid or fat in the ganglion cells.

This causes dysfunction of the central nervous system.

The correct option is d, e.

Learn more about Tay-Sachs disease

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urgent help would be appreciated

Answers

I think it’s B xxx not sure tho

Use the drop-down menus to answer the questions about binary fission. binary fission is a form of reproduction. binary fission results in cells that are .

Answers

Binary fission is a form of agamous reproduction. The cells produce by binary fission are two, and the cells that are produced are identical.

What is binary fission?

Binary fission is the division of the body into two identical bodies.

Binary fission is an agamous reproduction, in which the animals divide the cells into two cells and the second cell is called the daughter cell.

The single-celled animal reproduces by binary fission. Examples are hydra, bacteria, etc.

Thus, the correct options are 1. agamous reproduction, 2. Two, and 3. Identical cells.

Learn more about binary fission

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Just did the assignment

Explanation:

What are the issues / concern of cell research list five

Answers

Answer:

involves destruction of human identity

that's the answer

Question 23 (1 point)
Which below is NOT part of the lymphatic system?
a
spleen
b
bone marrow
C
lymph nodes
Od
tonsils

Answers

D tonsils
All are present except the tonsils

i need hel at science quick ASAP ​

Answers

Answers:

D) According to the graph, obesity and diabetes are intertwined, which could be why obesity and diabetes are linked.

E) Diabetes had the greatest rise in prevalence in 1997 until 2000, with prevalence percentages between about 76% to 78%.

Explanation: Explanation for these answers are below:

D) Looking at the graph, obesity and diabetes had similar prevalences in 1997 and 1998, and started to part ways a little in 1999.  In fact, even without the graph, scientists have known for a long time that people who have obesity also have diabetes.  This graph supports that claim because of how closely linked diabetes and obesity are and how similar the prevalence percentages are.

E) Diabetes had the greatest rise in 1997 to 2000, which had a 78% prevalence by 2000.  Obesity had very similar prevalence percentages from 75.5% to 77% in 1997 to 2000.

A student wants to determine the effect of soil type on plant growth. He set up 3 pots as shown below. How could this experiment be improved?

A - There is nothing wrong with this experiment.

B - The three pots should have different amounts of water

C - All three pots should have the same kind of seed, the same amount of light, and the same amount of water.

D - All three pots should have the same kind of soil.

Answers

The answer to how could this experiment be improved is C.

Answer:

C is correct

Explanation:

took test (k-12 student)

pls help ill give brainliest and 5 starrs

Answers

It would be the pacific plate.

To the left of the North American plate and South American, is the pacific plate which shares its border with both plates.

You had chosen the African plate it appears, however it only shares a border with the South American plate, not the North American plate.

Hope that helps!

How does natural selection enable species to changes their body shape, appearance, and/or size over time? *
A) Individuals that are better adapted to their environment survive and reproduce.
B) Overproduction provides food for stronger members of the species.
C) Environmental changes kill weaker members of the species.

Answers

Answer:

A

Selective pressures( Predators, less food etc. ) will cause the less fit variation of a species to decrease in population, causing them not to be able to reproduce. The more fit variation would be able to reproduce more so that over time, the individuals in the species will have the features of the more fit variation.

What does the Theory of Evolution state and what are the 4 evidences for it? *

Answers

Answer:

Mark me brainliest please I really need it

Explanation:

In biology, evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. The theory of evolution is based on the idea that all species are related and gradually chamge over time.Darwin's theory consisted of two main points; 1) diverse groups of animals evolve from one or a few common ancestors; 2) the mechanism by which this evolution takes place is natural selection.Evidence that supports the theory of evolution are fossils, embryological studies, anatomical and morphological characteristics (homologous organs, analogous organs, vestigial organs), molecular biology (comparing DNA sequences).

Which is hotter spica or Vega?

Answers

Answer:huh I dunno what that is

Explanation:

Can someone please help me? :(

Answers

Answer:

B i think or C

Explanation:

Because in the way I am thinking it's B, "School cooks should be educated on allergies to peanuts." It makes the most sense

Answer:  b

Explanation:

it can't be a since source 2 says "few people recognize..." which contradicts "students know what to do..."

it can't be c because there is no source comparing peanut allergies now vs. past.

it can't be d because you cannot infer this from the given data.

leaving us with b because since a majority of peanut allergies happen at school and not many know how to deal with an event with a peanut allergy, then teaching cooks about peanut allergies will help students in the case of an allergic reaction in school.

hope this helped! ♡

The carbon cycle refers to:
A. the mechanism by which carbon dioxide causes global warming.
B. the frequency of light energy that affects the rotational energy of carbon dioxide.
C. the oxidation of glucose to form carbon dioxide and water.
D. the movement of carbon through living organisms, the atmosphere, the sea, and the earth.

Answers

d. THE MOVEMENT OF CARBON THROUGH ORGANISMS AND THE ENVIRONMENT

Answer:

the movement of carbon through living organisms, the atmosphere, the sea, and the earth.

Explanation:

The carbon cycle is nature's way of reusing carbon atoms which travel from the atmosphere into organisms in the Earth and then back into the atmosphere over & over again.

Most carbon is stored in rocks and sediments, while the rest is stored in the ocean, the atmosphere, and in living organisms.

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