Life: Scientists have found signatures of life in
rocks from 3.5 billion years ago. That means life
existed in a world with very low oxygen! What
is the evidence?

Answers

Answer 1

Answer:The evidence to this is because oxygen, is produced by bacteria at that time! If they do That why would they need to use any oxygen? If i didn't get the answer you were asking then well sorry :/


Related Questions

Please answer fast please

Answers

Answer:

5 is d

Explanation:

you can see the trail it's leading . fat is yellow

Answer:

1. c) Carbohydrates

2. a) Phosphobilipid Layer

3. f) Cholesterol

4. b) Proteins

5. d) Fatty Acid Hydrophobic Tail

6. e) Hydrophilic Polar Head

Thoughts on Pokémon?

Answers

Answer: i like pokemon ;)

Explanation:

Answer:

Pokémon is a thing that you enjoy more if you grow up with it

Explanation:

DNA: TACATACGCGGGATT

Answers

Answer:

ATGTATGCGCCCTAA

Explanation:

Which of the following is released during cellular respiration

a. oxygen
b. air
c. energy (ATP)
d. lactic acid

Answers

the answer is oxygen

Answer:

C (energy ATP)

Explanation:

a)shrink
b)swell
c)neither ​

Answers

The correct answer is B

1. A cell does not need to use energy during
O active transport
exocytosis
O diffusion
O endocytosis

Answers

Answer:

The answer would be Diffusion because it does not require the use of energy

what do the base pairing rules have to do with replication

Answers

Answer:

Replication relies on complementary base pairing, that is the principle explained by Chargaff's rules: adenine (A) always bonds with thymine (T) and cytosine (C) always bonds with guanine (G).

Explanation:

A in Bio last year.

Which of the following correctly describes the image below? (5 points)


a
Protein Molecule

b
RNA Molecule

c
Amino Acid

d
Carboxylic Acid

Answers

C. Amino Acid , hope this helps
the answer is C. i hope this is correct:).

energy needed to get a reaction started is called ?

Answers

Answer:

Activation Energy

Explanation:

Hope that helps :)

What types of molecules are the least soluble in a polar compound such as water?

Answers

Answer:

Ethanol,Ammonia,Sulfur dioxide,Hydrogen sulfide

Explanation:

Plz I really need help I'll give all my points (20)

Answers

Answer:

I think it may be RNA

Mitosis and meiosis are processes involved in cellular reproduction. Which of the following describes an event that results from mitosis but NOT meiosis?
A) replication of genetic cellular material

B) four daughter cells that are different from each parent cell

C) daughter cells that are identical to the parent cell

D) two stages of cell division

Answers

Answer:

C. Daughter cells that are identical to the parent.

Explanation:

According to the question, Mitosis and meiosis are processes involved in cellular reproduction is two stages of cell division.

What is difference between mitosis and meiosis?

Mitosis involves the division of body cells, while meiosis involves the division of germ cells. The division of a cell occurs once in mitosis but twice in meiosis.

Thus, option "D" is correct.

To learn more about Mitosis click here:

https://brainly.com/question/26678449

What would happen to an animal cell with an internal salt concentration of 2% if it were placed in a salt solution with a salt concentration of 20%? (It helps to draw a picture) *
a.The cell loses water because there is a higher concentration of water inside the cell.
b.The cell loses water by pumping it across the membrane with the use of ATP
c.The cell gains water because there is a higher concentration of water inside the cell.
d.The cell stays the same because water will not move across the cell membrane.

please help me im trying to raise my grade up

Answers

Answer: The answer to this question is A

I’m pretty sure there is 3. Can someone help me?

Answers

Answer:

D. rigidity and shape that's why in plants they stand upright for photosynthetic process.

HELPP!! Describe how the enzyme transforms the substrate. Include in your answer the vocabulary terms: substrate, active site, enzyme, product(s).

Answers

A substance that speeds up a chemical reaction—without being a reactant—is called a catalyst. The catalysts for biochemical reactions that happen in living organisms are called enzymes. Enzymes are usually proteins, though some ribonucleic acid (RNA) molecules act as enzymes too.

Enzymes perform the critical task of lowering a reaction's activation energy—that is, the amount of energy that must be put in for the reaction to begin. Enzymes work by binding to reactant molecules and holding them in such a way that the chemical bond-breaking and bond-forming processes take place more readily.

PLEASE HELP
2. Do you think rapid or gradual environmental changes have a greater potential to affect
an organism's niche? Explain your answer.

Answers

Answer:

ofc it does !!

Explanation:

when the environment changes that specific animal niche will most likely change due to it being such a drastic change. for example when let's say the hunting rates have increased alot and that results in the drastic decrease of mice, well that was the main source of food that the foxes were getting and will make the move environments and change their diet drastically cause they cant find their regular diet. i hope this is what u were asking !

Most of the energy at earths surfaces is_____ that comes from the sun

Answers

solar radiation hope this helpsss!!!

Answer:

Most of the energy at earths surfaces is solar radiation that comes from the sun.

Explanation:

If a DNA strand contains 26% thymine, what percent adenine will there be in the
same DNA molecule?
Hint: use Chargaff's Rules
24%
27%
26%
23%

Answers

Answer:

26%

Explanation:

Adenine and Thymine are pairs. Therefore, they must have the same amount.

It must always equal 100% and base pairs always have the same amount.  So in this case Adenine and Thymine would be 26% and Guanine and Cytosine would be 24%.

Test question: If a DNA strand has 10% Guanine how much Adenine would there be?

Answer: G-10, C-10, A-40, T-40= 100%

I hope this helps! :)

What molecule Contains nitrogen atoms

Answers

Answer:

organic amines contain nitrogen atoms, N, that are singly-bonded to at least one carbon atom.

Explanation:

vote brainlyest

30 grams of ammonia (NH3), nitrite (NO2-), and nitrate (NO3-) are added to a soil sample.

Predict whether these concentrations would increase, decrease, or stay the same if nitrite-nitrifying bacteria were added to the sample.

Answers

If 30 grams of ammonia (NH3), nitrite (NO2-), and nitrate (NO3-) are added to a soil sample and nitrite-nitrifying bacteria are added, the concentration of the nitrate would increase, that of the nitrite would decrease, while that of ammonia would remain the same.

The process of converting ammonia to nitrate, also known as nitrification occur in two stages:

The conversion of ammonia to nitrite by ammonia oxidizing bacteria.The conversion of nitrite to nitrate by nitrite-oxidizing/nitrifying bacteria.

Now, if nitrite-nitrifying bacteria is added to the soil sample above, it means that only the nitrite would be converted to nitrate. The bacteria will not be able to oxidize ammonia.

Hence, some of the nitrite would be converted into nitrate leading to the reduction in the concentration of the former, and an increase in the concentration of the latter. The concentration of ammonia will remain unchanged.

More about nitrification can be found here: https://brainly.com/question/17023197

Where are the hydrogen bonds located in water molecules?
А
between oxygen and hydrogen atoms in a water molecule
B
between the oxygen and hydrogen atoms of two different
water molecules

Answers

Answer:

B Is true

Explanation:

Hydrogen bonds locate between oxygen and hydrogen atom of different water molecules in water

Otis watches a cooking show on making mayonnaise. The chef dissolves salt and sugar in vinegar. She mixes in an egg yolk, and then mixes in oil until the ingredients are completely blended together. The chef says that it’s great on sandwiches and that it can be stored without separating.

Which best describes the purpose of the egg yolk in the recipe?

It allows the oil to change from liquid to a gas in order to form bubbles.
It acts to hold the vinegar and oil together in a colloid.
It helps the vinegar be able to form a solution with the salt and sugar.
It mixes with both the vinegar and oil to form a suspension.

Answers

Answer:B

Explanation:

It keeps the mayonnaise together I think

Answer:

b. it acts to hold the vinegar and oil together in a colloid

Explanation:

i hope this helps!!

PLEASE HELP ME I REALLY NEED THE ANSWER
Which is the correct order of the Taxonomic Groups from broadest to more specific?

a). Domain, Kingdom, Phylum, Class, Order, Family, Species, Genus

b). Domain, Kingdom, Phylum, Class, Order, Family Genus, Species

c). Kingdom, Domain, Class, Phylum, Family, Order, Genus, Species

d). Domain, Phylum, kingdom, Class, Family, Order, Genus, Species

e. None of the above

Answers

The answer is b domain, kingdom, phylum, class, order, family, genus, species

The browning of potatoes on contact with oxygen is caused by the enzyme reaction depicted above. Which of the following could increase the rate of this reaction?

A. Adding more catechol oxidase

B. Adding more benzoquinone

C. Reducing the amount of catechol

D.Reducing the amount of catechol oxidase

Pls help! P.S. you may or may not have to click on the picture to see all of it. Thank you.

Answers

Answer:

I think it is adding catechol oxidase

Explanation:

This is because more enzymes are able to take in more substrates, or reactants more quickly, therefore increasing the speed of the reaction.

Hope this helps!

Answer:

he is correct it is adding catechol oxidase

Explanation:

it would increase the rate of the reaction

give the names of two part of the leaf cell that would not be found in a human liver cell.

Answers

Answer: nobodys smart but me.

Explanation:

your kinda dumb

Answer:

Chloroplasts, vacuole.

Explanation:

   hope this helps. im not garanteed its this but i think it is.  :)

Type your response in the box.
Watch this video about the stresses on the body caused by carrying heavy backpacks. Then design an
investigation about the effect of carrying backpacks on students' health using these steps of the scientific method:
• make observations or inferences
• ask questions
• construct hypotheses and make predictions
• test hypotheses
• analyze results
Your investigation can address any question you have about backpacks and student's health that you choose.
PLATO helppp

Answers

Answer:

Make observations or inferences: In school, most students carry a backpack. Students frequently complain that their backpacks are heavy or hurt their backs.

Ask questions: Do students who carry heavier backpacks report more pain than students who do not?

Construct hypotheses and make predictions: Students who carry heavier backpacks are more likely to experience pain in their back at the end of the school day.

Test hypotheses: Get a sample of students in the school to help with the experiment. All students in the experiment would be students from the school and have no known back conditions. Then weigh the students’ backpacks, and ask the students if they have back pain at the end of the day.

Analyze results: Record the data in a table, and then organize the information by the weight of the backpacks. Group the backpack weights in five-pound intervals (five pounds, ten pounds, etc.) and use a bar graph to show the yes and no responses to the pain question for each student.

Explanation:

trust me its right bro

Answer:

Make observations or inferences: In school, most students carry a backpack. Students frequently complain that their backpacks are heavy or hurt their backs.

Ask questions: Do students who carry heavier backpacks report more pain than students who do not?

Construct hypotheses and make predictions: Students who carry heavier backpacks are more likely to experience pain in their back at the end of the school day.

Test hypotheses: Get a sample of students in the school to help with the experiment. All students in the experiment would be students from the school and have no known back conditions. Then weigh the students’ backpacks, and ask the students if they have back pain at the end of the day.

Analyze results: Record the data in a table, and then organize the information by the weight of the backpacks. Group the backpack weights in five-pound intervals (five pounds, ten pounds, etc.) and use a bar graph to show the yes and no responses to the pain question for each student.

Explanation:

Its the sample answer

What acceleration would be produced if a 25 N force acts on a 5.0 kg mass? (a = F/m) *

Answers

Answer:

5 m/s

Explanation:

Using the formula, the force is 25 N, and the mass is 5 kg.

Simply divide 25/5.0

Then, you would get 5 m/s

I hope this helps.

How long does it take a jumbo jet to travel a distance of 2400 miles if they are traveling at an average speed of 400 miles/hr?

Answers

Answer:

6 Hours

Explanation:

These cells have been found at the end of a pathway lined with the above cells and help absorb oxygen.


What type of organ do you expect to have tissues made up of the above cells and why?

Answers

Answer:Human body tissue makes up organs and other body parts. There are four main types of tissue: muscle, epithelial, connective and nervous. Each is made of specialized cells that are grouped together according to structure and function. Muscle is found throughout the body and even includes organs such as the heart.

As we saw above, every organ is made up of two or more tissues, groups of ... Image credit: modified from Types of tissues:

Explanation:

Mark as brainlist please btw i hope the answer helps you have a great day

People’s choices can have a positive or negative effect on their health. Describe one positive choice and one negative health choice a person could make. Be sure to explain how each could impact an individual’s health and, if applicable, the health of others.

Answers

People nowadays try to live a healthier lifestyle. The positive and negative choices depends on some aspects. For instance, a person with a normal weight or thin can be unhealthy . Health also includes the good amount of nutrition and exercise not only the weight. A good choice a person can make is exercise more and intake good amounts of nutrition. A bad choice is not exercising and not having adequate intake of nutrition. Some people tend to lose weight by quiting some nutrients which will have a bad effect on their health since all the nutrients are important for the body and avoiding some nutrients can cause deficiency. The best thing to do is diet on calories, a type of diet from which you can eat anything(all types of food including vegetables and fruits ) but measure your calorie intake , with this a person has a higher chance of losing weight and being healthy. Exercise too is an essential factor needed for a healthy lifestyle. If a person has a lifestyle which they need to move alot(jobs including sports etc) then you can say its enough but if not a person must do exercise at least twice or more a week for better health. Quitting smoking and drugs of course has a good effect.

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