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

Someone help me please lol

Answers

Answer:

what do you need help with.

Explanation:

what is the definition of Concentration Gradient?​

Answers

Concentration gradient= the difference in the concentration of a substance between two areas.

Please help I will make brain list ​

Answers

Answer:

light reflection

Explanation:

often seen by sunlight to windows

the answer is reflection.
why:
-refraction is going through a liquid or substance and bending light wheareas reflection bounces the light back off

Describe the cell structure of fungus in detail with a neat labeled diagram.

Answers

Answer:

Fungal cells differ from mammalian cells in that they have cell walls that are composed of chitin, glucans, mannans, and glycoproteins. Both mammalian and fungal cells have cell membranes; however, they differ in their lipid composition.

Explanation: Like plants and animals, fungi are eukaryotic multicellular organisms. Unlike these other groups, however, fungi are composed of filaments called hyphae; their cells are long and thread-like and connected end-to-end, as you can see in the picture below.

During Transcription, an)
is created in the
A. mRNA strand, nucleus
B. polypeptide chain, nucleus
C. protein, cytoplasm
D. tRNA strand, cytoplasm

Answers

Answer:

A. mRNA stand, nucleus

Explanation:

Transcription is defined as the process of copying DNA. This happens so that the cell can produce the proteins necessary for basic life functions.

DNA cannot simply be taken out of the nucleus that easily. So, the DNA must be copied into a different form. That's what RNA is for, specifically mRNA.

mRNA stands for "messenger RNA", which is a copy of DNA that can be transported outside the nucleus and be read to produce proteins in ribosomes.

Transcription happens in the nucleus, where the DNA is housed in. It can't be located anywhere else anyways since DNA cannot leave the nucleus.

Therefore, our answer is A.

Topic: AP Biology

DNA and Rna are macromolecules made up of what?

Answers

Answer:

Nucleotides

Explanation:

"These macromolecules consist of a large number of linked nucleotides, each composed of a sugar, a phosphate, and a base."

Hope this helps:

DNA, RNA, and the Flow of Genetic Information

https://www.ncbi.nlm.nih.gov/books/NBK21171/

DNA and RNA are macromolecules made up of units called nucleotides.

What are nucleotides?A nucleotide is the most fundamental element of nucleic acids (RNA and DNA). A sugar molecule (ribose in RNA or deoxyribose in DNA) is bonded to a phosphate group and a nitrogen base to form a nucleotide. Adenine (A), cytosine (C), guanine (G), and thymine (T) are the bases that make up DNA. The base uracil (U) replaces for thymine in RNA. Long chains of nucleotides make up DNA and RNA molecules, which are polymers.

hence nucleic acids like DNA and RNA are made up of nucleotides

learn more about nucleotides here:

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4 Which muscles are actively involved in normal breathing?

Answers

The lungs have no skeletal muscles of their own. The work of breathing is done by the diaphragm, the muscles between the ribs (intercostal muscles), the muscles in the neck, and the abdominal muscles.

Answer:

The main muscles are the diaphragm and intercostal muscles, but the muscles in the neck and the abdominal muscles also help.

Explanation:

The diaphragm is the muscle under the lungs that helps move the lungs while the intercostal muscles are the muscles in between the ribs.

In a pyramid of numbers, what will be the largest trophic level?
A. Primary Consumers
B. Secondary Consumers
C. Decomposers
D. Producers

Answers

Answer= D. Producers
D is correct bc they are autotrophs

What is the summer sleep of frog called??​

Answers

Answer:

answer is aestivation

Explanation:

Love ya bye!

(*Its actually Physical Science)
Which kind of bond would occur between sodium (Na, Group IA) and chlorine (CI, Group VIIA)?
*I need this ASAP

A. ionic
B. no bond
C. metallic
D. covalent​​

Answers

An ionic bond would form between these two atoms.

what will happen if all snakes are killed​

Answers

If all snakes are killed the prey population will grow and overlap effects would ripple through the ecosystem and cause considerable damage. the prey population that snakes feed on would grow, and the predators that feed on snake will die out.

Which term defines a well tested,scientifically supported statement that describes how something happens

Answers

Answer:

The term would be: Theory

Explanation:

A theory is a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained. It is a well-substantiated explanation of an aspect of the natural world that can incorporate laws, hypotheses and facts.

Answer:

theory

Explanation:

In a randomized trial, scientist try to make sure that there is only one difference between the two groups. What do we call all the things that are the SAME Between the two groups?

A. Predictions
B. Controls
C. Constant
D. Variables

Answers

Hey there! I'm happy to help!

A. Predictions are guesses you make about the result of a trial. Let's say that you want to test what will happen if you put less eggs into a cookie recipe. You could make a prediction that the cookies will be more crumbly. This is not the term for things that are the same between two groups, so this is incorrect.

B. Controls are a type of variable that isn't influenced in a unique way as part of the experiment. This is to be able to compare the things you change to a thing that hasn't changed. With our cookie example, a control group would just be a cookie recipe with the normal amount of eggs. Then we can compare a normal cookie to one with less eggs. We see that a control is a type of group, and not a specific thing that is similar or different between the groups, so this is incorrect.

D. Variables are things that  can change or vary in your experiment. There are independent variables, which are things that you change, such as the number of eggs in the recipe. Then, you have dependent variables such as color, texture, taste, etc. However, these can change depending on the group because the number of eggs could switch, so this is the wrong term and incorrect.

C. Constants are things that you do not change as part of your experiment. You do not change these variables. In our case, the constants will be all of the other ingredients like the amount of flour, milk, water, sugar, etc. If we have a control group and a group with less eggs, these things will remain constant in both of them. So these things are the same between the two groups, so this answer is correct.

We call the things that are the same between the two groups C. constants.

Have a wonderful day and keep on learning! :D

if your leg was to get cut off where would you feel the pain?

Answers

The thigh area will feel much more pain as when leg is cut off , all nerves are together in thighs, so more pain will be there.

Hope it helps you... pls mark brainliest if it helped you

Answer:

The nerve(s) in your leg.

Explanation:

It's not your leg that will hurt but the nerve in your leg. So wherever the leg is cut, the nerves will have to be cut as well, but also after one of your limbs is amputated, you may feel like the limb is still there. That's called phantom sensation. You might feel pain in your limb even though it is physically not there.

2. A nucleus contains tiny rod-shaped
boll bodies. What are they called?

Answers

A nucleus is something that idek what ur talking abt
the answer is nucleus

1. What happens when matter changes state?
a. Its chemical properties change.
b. Its physical properties change.
c. The energy of its particles remains the same. hape
d. two of the above

Answers

Answer:

Matter either loses or absorbs energy when it changes from one state to another. For example, when matter changes from a liquid to a solid, it loses energy. The opposite happens when matter changes from a solid to a liquid. For a solid to change to a liquid, matter must absorb energy from its surroundings.

Answer:

d.

Explanation:

Its chemical and physical properties changes as a result of a change in temperature (increase or decrease in temperature).

Prophage refers to: (please give right answer only)​

Answers

Answer:

: an intracellular form of a bacteriophage in which it is harmless to the host, is usually integrated into the hereditary material of the host, and reproduces when the host does.

Describe the effect of increased carbon dioxide concentration on blood pH​

Answers

Answer:

As it combines with water, it forms carbonic acid, making the blood acidic. So CO2 in the bloodstream lowers the blood pH. When CO2 levels become excessive, a condition known as acidosis occurs. This is defined as the pH of the blood becoming less than 7.35

The increase in the carbon dioxide concentration on blood pH leads to the condition known as Acidosis.

What is the normal blood pH?

The level of normal blood pH in humans significantly ranges from 7.35 to 7.45 on a pH scale. It is considered neutral but experimentally it is slightly basic in nature.

As the concentration of carbon dioxide in the blood increases, the carbon dioxide in the presence of water forms carbonic acid which lowers the blood pH from 7.35.

This reduction in blood pH is known as acidosis. This is caused by the overproduction of acid within the body due to excessive concentration of carbon dioxide in the blood's pH. Acidosis leads to feeling fatigued, lethargic, muscle aches, etc.

Therefore, the concentration of carbon dioxide on blood pH negatively harms the health of an individual.

To learn more about Blood's pH, refer to the link:

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

Answers

D. Wax, saturated fat and phospholipids are all kinds of fats a polysaccharide is a sugar or carb.

What is the average for the following set of measurements?
27°C, 12°C, 31°C, 19°C, 23°C, 11°C, 17°C O A. 20°C B. 14000 C. 7°C O D. 28°C​

Answers

Answer:

A. 20°C

Explanation:

If you add 27,12,31,19,23,11, and 17 altogether, it's 140. 140 divided by 7 is 20. So, 20 is the average.

- Which cell structures are similar in the way they protect, support, and hold the other
organelles together?
A. Cell Wall, cytoplasm, and lysosomes
B. Cell membrane, cytoplasm, and ribosomes

Answers

Answer:

A

Explanation:

cell wall - protection against mechanical

cytoplasm - provide a platform which organelle can operate within the cell

lysosomes - helps cells to self destruct

Which statement about multi cellular organisms is correct

Answers

Answer:

don't know ???????????

describe the possible long term effects of HIV on the immune system​

Answers

Explanation:

HIV attacks a specific type of immune system cell in the body. It's known as the CD4 helper cell or T cell. When HIV destroys this cell, it becomes harder for the body to fight off other infections. When HIV is left untreated, even a minor infection such as a cold can be much more severe.

What are the homeostatic pressures an axolotl goes through and how do
they deal with that?

Answers

Here is a link to understand the whole concept, of the homeostatic pressures on axolotl: https://www.sciencedirect.com/science/article/pii/S0301008217302113

Identify the Levels of Organization in a Multicellular Organism

1: Cells

2: Organ System

3: Tissue

4: Organ

DONE!

Answers

Answer:

2 3 4. is the correct answer

The force that pulls planets toward the Sun is called
gravity
magne
Offerentiation

Answers

Answer:

The force that pulls planets towards the Sun is called gravity.

Use your knowledge of Protein Synthesis, and the provided chart, to identify the
correct Amino Acid sequence from the mRNA strand: AGUUGGUCUGUA


A: serine, tryptophan, serine, valine
B: aspartic acid, valine, leucine, asparagine
C: leucine, histinde, glutamic acid, leucine
D: serine, threonine, arginine, aspartic acid

Answers

Answer:

A: serine, tryptophan, serine, valine

Explanation:

Hi there!

Protein Synthesis is the process where proteins are created from DNA.

We are given the mRNA strand AGUUGGUCUGUA, as well as a provided chart

The mRNA strand is created out of nucleotides (each of the letters is one nucleotide in the code), which will code for a specific chain of amino acids, creating a protein.

Each amino acid is made up of 3 nucleotides. This sequence of 3 nucleotides is called a codon.

So we can break up the code into groups of 3, to make identifying the codons easier.

AGU UGG UCU GUA

Now we need to figure out which amino acid each codon codes for. Thankfully, we were given a chart that can help us with that.

The chart is read where the first base is on the left, and is vertical. The second base is in the center, yet is horizontal. The third base is on the right, and is also vertical.

Let's start with the first codon, which is AGU

The first base is A. The second base is G, and the third base is U. So the first amino acid is serine (ser)

The second codon is UGG.

The first base is U, the second base is G, and the third base is G. So the second amino acid is tryptophan (trp)

The third codon is UCU

The first base is U, the second base is C, and the third base is U. So the third amino acid is serine (ser)

The fourth codon is GUA

The first base is G, the second base is U, and the third base is A. So the fourth amino acid is valine (val).

That means the amino acid sequence from the mRNA code is: serine, tryptophan, serine, valine. The answer is A

Hope this helps!

what could a human living millions of years ago have in common

Answers

What are your options, kid?

Suppose a rural community lives at the top of a mountain. They hold a community meeting to discuss the following options to use as their main energy source; Hydro-power, wind energy, or biofuel. List their options from the ideal to the least ideal. Explain your answer.

Please answer ASAP... Ill give brainliest​

Answers

wind energy is also expensive to start as theyll need something like a wind turbine to change it to electricity and considering their location winds are strong at mountain tops so this would be very ideal for them once properly established. bio fuel is the cheapest and easiest to start but it has the biggest effect on the environment as theyll be using wood from trees etc which could destroy their land and lead to soil erosion, drought, desertification and land slides.
hydro power is expensive to start but once established it provides a very reliable source of electricity. they live at a mountain top so i doubt there are any rivers to use hep.

Which of the following are measurable? (Select all that apply)
✓ How often a plant is watered
✓ How much sunlight a plant receives
Seeing the pretty leaves on a plant
The actual number of new leaves on a plant

Answers

Answer:

a

Explanation:

well of you use a cup to give a plant water you can measure how much it drinks

The measurable factors are A) How often a plant is watered, B) How much sunlight a plant receives, D) The actual number of new leaves on a plant.

Options (A) (B) & (D) are correct.

Measurable factors are those that can be quantified or expressed numerically. A) The frequency of watering can be counted and tracked over time. B) Sunlight can be measured in terms of intensity, duration, or light levels. C) "Seeing pretty leaves" is subjective and not quantifiable.

D) The actual number of new leaves is a concrete count, making it measurable. When studying or managing plants, it's essential to focus on quantifiable aspects, like watering frequency, sunlight exposure, and counts of observable changes, for accurate analysis and decision-making.

To learn more about   watering frequency  here

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The complete question is:

Which of the following are measurable? (Select all that apply)

A) How often a plant is watered

B) How much sunlight a plant receives

C) Seeing the pretty leaves on a plant

D) The actual number of new leaves on a plant

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