Scientists use genetics to trace the evolution and migration of humans. How do scientists know which populations are older than others

Answers

Answer 1

Answer:

Scientists often look at mitochondrial DNA to determine these chronological relationships. Mitochondrial DNA mutates at a relatively predictable rate, often referred to as the "molecular clock". By comparing the amount of mutations between groups compared you can determine which groups have been around longer and therefore have acquired more mutations.

Explanation:


Related Questions

Which type of front most likely signals violent thunderstorms?
A cold front
B. warm front
C. stationary front
D. occluded front

Answers

Answer:
B.) warm front

Explanation:
This is also why hurricanes occur late throughout the year because it’s often hot.

Identify the fuel that could be classified as a nonrenewable or renewable resource.

Answers

Answer:

Coal, petroleum, and natural gas are considered nonrenewable because they can not be replenished in a short period of time. These are called fossil fuels.

Explanation:

Olfaction and hearing are processed in the ____________.

Answers

Answer: Temporal Lobes

What term associated with psychological disorders best describes a thought, feeling, or behavior that is atypical or rare?.

Answers

Answer:

Personality disorders are a group of mental health conditions that are characterized by inflexible and atypical patterns of thinking, feeling, and behaving. These inner experiences and behaviors often differ from the expectations of the culture in which someone lives.

Explanation:

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how can we conserve our natural resources in the environment?

Answers

Answer:

Switching to sustainable energy sources such as solar power, hydroelectric power and wind power can reduce the amount of fossil fuels being used up. Fossil fuels are natural resources from the environment, but when burned the waste product of it is released into the environment and can potentialy affect other natural resources. Switching to a renewable energy source can help conserve natural resources. Renewable energy sources can be used to harness the energy we need without producing harmful products that affect the environment and it's resources.

Which organisms are always on the first level in a food chain?.

Answers

Answer: PLANTS ,ALGEA AND BACTERIA

Explanation:

what are chlamydomonas​

Answers

Chlamydomonas is a genus of green algae consisting of about 150 species all unicellular flagellates, found in stagnant water and on damp soil, in freshwater, seawater, and even in snow as "snow algae"

Directions: This group of questions consists of five lettered headings followed by a list of phrases or sentences. For each phrase or sentence, select the one heading to which it is most closely related. Each heading may be used once, more than once, or not at all
This group of questions refers to molecules of the following substances.
(A) Cytochrome
(B) FADH2
(C) NAD
(D) NADP
(E) Oxygen

Answers

These molecules involve an intermediate electron acceptor for oxidations that occur during glycolysis and Krebs reactions. It is part of cellular respiration.

What is cellular respiration?

Cellular respiration refers to a series of chemical reactions by which foods can be aerobically converted into energy (ATP) by using oxygen.

Cellular respiration can be divided into Glicolisys, the Krebs cycle and oxidative phosphorylation.

Cellular respiration involves oxide reduction reactions that involve the transfer of electrons (e-) between two or more substances.

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Someone sprays perfume in another room. It can be smelled a few minutes later. Which process is this called?.

Answers

Answer:Diffusion is a much more general term which can apply to all different types of molecules. 

Explanation:

In warm, shallow, marine environments, corals and other marine life typically construct _______. Multiple choice question. Stromatolites tidal flats reefs

Answers

Answer:

reefs

In warm, shallow, marine environments, corals and other marine life typically construct reefs.

Why does an energy transfer not always result in phase change? Amplify

Answers

Answer:

These energy exchanges are not changes in kinetic energy. They are changes in bonding energy between the molecules. “If heat is coming into a substance during a phase change, then this energy is used to break the bonds between the molecules of the substance

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The __________ is the control center of the body. a. brain b. spinal cord c. central nervous system d. peripheral nervous system please select the best answer from the choices provided a b c d

Answers

The control center of the human body is the brain. The brain keeps and controls the challenge of virtually all physical features including digestion, excretion, the thrashing of the heart.

Your mind is just like the manage middle of your frame. It controls your respiration and heartbeat. It lets you suppose and learn. The mind is so "valuable" to all of your frame systems, it is now no longer sudden that the mind and spinal twine are known as the valuable frightened system.

What is the brain made up of?

The human mind is by and large composed of neurons, glial cells, neural stem cells, and blood vessels. Types of neurons encompass interneurons, pyramidal cells such as Betz cells, motor neurons (higher and decrease motor neurons), and cerebellar Purkinje cells.

Thus it is clear that the brain is the control center of the body.

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Answer:

Brain

Explanation:

How should “free water” have been administered to the patient?

Answers

Answer: Via ice chips or water, although not appropriate for all patients.

Explanation:

Patient is allowed to drink water btwn meals (beginning a minimum of 30 mins after meals); oral care must be done prior to consuming water; patient should be upright and use appropriate swallowing strategies.

how would a plant cell function if it did not contain chloroplasts?​

Answers

Without chloroplasts the plant would probably die

Because chloroplasts are used for photosynthesis, which gives the plant food and energy it needs to survive and without them the plant can't get any food/nutrients

b) Type a second paragraph comparing the accuracy of your model to actual organ systems and
their functions.
i.
Consider how a model is different from an actual human body.
ii.
Describe the limitations of a model.

Answers

Answer:

In comparison to the real thing, a model can help you visualize or picture in your mind something that is difficult to see or grasp, as well as express ideas and understand the process. Models, on the other hand, cannot incorporate all of the features and accuracy of an actual human body part since they must keep it simple enough to understand, which limits the models, despite their value.

Explanation:

what type of cell is osmosis jones?

Answers

Answer:

white blood cell

Explanation:

What happens to the temperature and density of the material between points D and A

Answers

Answer:

It becomes naturally warm

Explanation:

What is the most common element found in the human body? Why is it so
common?

Answers

Answer:

Sample Respond: Oxygen is the most abundant element in the human body. It makes up 65 percent of the total weight of a person. For a person with a weight of 155, about 94 pounds of her total weight would be made of the element oxygen. This is due mainly to the body's water content.

Explanation:

I got 100 %

Answer:

Oxygen... Oxygen is the most common element in the human body, comprising approximately 65.0% of body mass. Most of the oxygen present is found in the form of water.

Explanation:

does this help you???

The coagulation of
plasma and
platelets is what
causes....
A. hemoglobin production
B. blood clotting
C. white blood cell
production
D. gas exchange

Answers

The coagulation of plasma and platelets is what causes blood clotting in organisms.

What is Clotting?

This is the process in which blood changes to gel and helps to stop bleeding when someone gets hurt.

Blood clotting occurs when plasma and platelets coagulates to form a layer  thereby stopping blood flow.

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The phospholipids of plasma membranes are amphipathic: they have both hydrophilic and hydrophobic regions. The hydrophobic core of the plasma membrane helps some materials move through the membrane, while it blocks the movement of others. How does the structure of the cell membrane help to enable its function?

Answers

Answer: The structure of cell membrane is semi-permeable which allows it to pass only certain molecules.

Explanation:

The phospholipid bilayer includes phospholipids that are tightly packed. This membrane is semi-permeable in nature and it can be said that it is selectively permeable. Across this the small, nonpolar materials can pass through as lipid tails of the membrane are nonpolar in nature. Examples of the molecules that can pass through the lipid bilayer are oxygen, carbon dioxide, and others. But the water soluble molecules need assistance of nonpolar molecules to pass through it like glucose, and amino acids as they are oppose by the hydrophobic tails.

Why is school a thing

Answers

Answer:

because it helps us gain knowledge that will help us in the future

Explanation:

paper is a plant fibre Yes or No if yes how it become a plant fibre and how it is obtained from plants?​

Answers

Answer:

Yes paper is a plant fibre .

Paper is a dried, compressed mat of plant fibers—nothing more, nothing less. ... Paper is more like the fabric we call felt, made without the weaving stage by pressing together cellulose fibers extracted from plants and trees so they knit and fuse to form a strong, solid, but still very flexible mat.

Which labeled structure identifies where passive water reabsorption takes place in the kidney?.

Answers

Where’s the picture?

Passive water reabsorption takes place in the kidney as it would be in the Tubules, both the proximal and the convoluted tubules.

What happens in the tubules?

In the tubules, most of the reabsorption happens such as sodium, wherein approximately 65 percent of it is reabsorbed. In the process of reabsorption, both water and the solutes are eliminated from the tubular fluid. Once it is removed, this is then sent into the blood.

Dialysis may be defined as a methodology that significantly eliminates waste products and excess fluid from the blood when the kidneys stop working properly. It is also referred to as renal replacement therapy.

The procedure of dialysis is only performed when the kidney is absolutely unable to perform its normal functions properly. Due to this, the blood gets contaminated and toxic because of the accumulation of waste products that are not eliminated from the body.

Therefore, Passive water reabsorption takes place in the kidney as it would be in the Tubules, both the proximal and the convoluted tubules.

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6. In her essay, White discusses how she uses trial-size detergent and orders water instead of wine
If you were in a tough spot financially, are there things you would be willing to give up? What
would you give up and why? How would your life change? Discuss.

Answers

In a difficult financial situation, I would be willing to give up, I wouldn't give up on dreams, I would replan my life.

What is financial stress?

Difficulty dealing with debts, excessive worries and anxiety about interest; excessive fear of losing a source of income; fear of having to lower the standard of living in which one lives; among others.

With this information, we can conclude that in a difficult financial situation, I would be willing to give up, I wouldn't give up on dreams, I would replan my life.

Learn more about financial in brainly.com/question/11555016

Answer: If I was in a bad financial spot, and needed to save money I would do multiple things, such as making my own coffee at home rather than stopping at Starbucks, or getting water instead of a soda at a restaurant. Simple things that can be changed to be cheaper for me. This wouldn’t really change my life because it is small, simple changes.

Explanation:

In California wildfires are very common, how do wildfires affect the carbon cycle? a More sugars will be available for animals to eat b The availability of fossil fuels fo r use by industries in the area will be reduced c Less carbon dioxide would be removed from the atmosphere in the area by plants d More carbon dioxide will be removed from the atmosphere in the area by plants

Answers

Answer:

d. More carbon dioxide will be removed from the atmosphere in the area by plants

Explanation:

Wildfire are defined as an uncontrolled or unplanned fire in an area.

Wildfires are common in California because of combustible vegetation and that affects the carbon cycle. When vegetation burns during wildfire it releases a lot of carbon dioxide. Higher carbon-dioxide increases the rate of  photosynthesis in plants. Plants utilize the higher CO2 concentration at a faster rate and more carbon dioxide will be removed from the atmosphere.

Hence, the correct answer is "d".

Draw a diagram of a cell in anaphase 2

Answers

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Which of the following statements would be MOST
important to include in an objective and accurate
summary of the article?
A
People should pay more attention to the
environment in which the food that they
consume is grown
B
Historical and scientific evidence indicates that
healthy soil is essential to sustaining human
populations
0
Governments and international organizations
have rightly taken action to conserve soils.
D
Human development has caused extensive
and irreparable damage to a majority of
Earth's soils

Answers

Answer:

B

Explanation:

This is regarding to significance of the soil from which plants grow ,from ecological point of view there is an interaction between organisms with this reason plants are major source of food in most of organism on planet earth!

What type of protein is involved in the sodium-potassium pump mechanism?

Answers

transmembrane ATPase.

Question 5 of 25 The development of cars has pros and cons. The car has allowed for better transportation, but it is also responsible for a great deal of pollution. Which activity can help reduce pollution through the use of new technology?​

Answers

Answer: C. building cars that can better withstand collisions

which structure is present in bacteria but not in a virus?
1) Nucleic Acid
2) Capsid
3) Cell Membrane
4) Envelope

Answers

3) Cell Membrane


Its a structure of the cells in living organisms formed by a double layer of lipids, glycoproteins, and structural proteins.

Hope this helps <3

Answer:

Yes the only structure not present in a virus is C) Cell membrane

correct on edg2021 :)

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