What do scientist use to determine the begining or end of a geologic time period?

mass extinctions


diversification of life


index fossils

supercontinent formation and movement

Answers

Answer 1

Answer:

i think it is c

Explanation:

The fossil forms that occur in the rocks, however, provide the chief means of establishing a geologic time scale, with the timing of the emergence and disappearance of widespread species from the fossil record being used to delineate the beginnings and endings of ages, epochs, periods, and other intervals. i am not trying to copy the other guy or girl


Related Questions

is the bladderwrack ficus gardneri endangered?

Marine Bio.

Answers

Answer: Chromista

Explanation:

Which statement is true about DNA base pairing rules?
A- cytosine can pair with guanine only
B- adenine can pair with cytosine only
C- Adenine can pair with thymine or cytosine
D- cytosine can pair with Adenine or guanine

Answers

Answer is A - Cytosine can pair with guanine only.


It would not be the others because:
Base pairs are A and T/U, C and G.

B) Adenine does not pair with cytosine.
C) Adenine can pair with thymine, however it does not pair with cytosine.
D) Cytosine can pair with guanine, but does not pair with adenine.

The surge of blood entering arteries causes an expansion and recoil of the arterial wall producing a _____________ that can be felt externally.

Answers

Answer:

I think the answer you're looking for is pulse

I need some help pls
1what is the function of an enzyme


2 how are proteins made

Answers

the proteins are made up of fat

HELP PLS!!!!!!!!!!!!
Beaches are monitored to protect public health. Waterborne pathogens can cause illnesses. Which of the following is not a common type of pathogen at the beach?

Bacteria
Protozoa
Viruses
Worms

Answers

ALL these microorganisms can represent common types of pathogens at the beach. In consequence, it is imperative to take precaution measures to avoid infections.

The sand at the beach may contain dog feces, which is known to transport Toxocara canis, a parasite roundworm able to infect humans.

Moreover, samples of beach sand may also contain different types of pathogenic bacteria (e.g., Staphylococcus species, E. coli, Enterobacteriacea, etc) and viruses (e.g., enteroviruses, hepatitis A, Norwalk viruses, reoviruses, rotaviruses, etc).

In consequence, it is imperative to wash hands with soap and water when touching beach sand that is suspected to be contaminated.

Finally, marine water may also be contaminated with different zoonotic protozoa such as, among others, Giardia, Cryptosporidium and Toxoplasma.

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Answer:

The correct answer is worms.

Explanation:

Yes, all of these can be found at the beach, but worms are not common. Also, I took the test lol!

Study the diagram showing the range of temperature in the Earth’s layers.

Which temperature most likely corresponds to the asthenosphere?

1,613°C
2,521°C
3,628°C
6,217°C

Answers

i think c is the correct option...

Answer: a) 1,613°C

Explanation: just took the test

Water is warmed by the sun and cooled by night . It is then cooled and _____

Answers

Answer:

Frozen

Explanation:

When it heats up water evaporates and when it's cold it does the opposite, it freezes because of the low temperature.

The answer would be that it’s frozen

within a forest ecosystem, there is a large amount of diversity among members of a warbler species. of the following stages of meiosis illustrated for a typical cell, which contributes most to diversity among the warblers?

Answers

Crossing over occurs between homologous chromosomes, and is closely involved in genetic variation. The stage that most contributes to diversity is stage C, where you can see chromosomes after crossing-over.

----------------------------  

There are different mechanisms involved in producing genetic variation among descendants. These are,

Crossing-over between homologous chromosomes (prophase 1), Random lining of homologous chromosomes (metaphase 1),Random fertilization  

The Crossing-over events occur between two homologous chromosomes in the equatorial plane and make the daughter cells genetically different from the original one.

The Chiasma is the position where two homologous chromatids interchange genetic information, giving a place for new genetic material or information to be provided to descendants.

After crossing over, homologous chromosomes get separated again.  

In the attached imaged there are four different stages of meiosis.

Stage C is the one that contributes the most to diversity.

We can see that crossing over has already occurred between homologous chromosomes, and they have already interchanged segments.

In the image you will see the difference between chromosomes that has gone through the crossing over mechanism, and chromosomes that has not. The difference in color represents segments interchange and variation.

-----------------------------------

You can learn more about crossing over at

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https://brainly.com/question/394891?referrer=searchResults

What happens to mRNA after transcription ?

A- It is transported to a mitochondrion for respiration
B- It exits the cell through the plasma membrane
C-It remains in the nucleus to begin translation
D-It enters the cytoplasm and goes to a ribosome

Answers

I think the answer is A
The answer is D - It enters the cytoplasm and goes to a ribosome

After transcription, mRNA leaves the nucleus of a cell through the nuclear pores, entering the cytoplasm and goes to a ribosome to begin the translation process of synthesising proteins

what is another name for the polymers of carbohydrates?

Answers

Answer:

polysaccharide

Explanation:

Describe the composition of the cell membrane

Answers

Explanation:

With few exceptions, cellular membranes — including plasma membranes and internal membranes — are made of glycerophospholipids, molecules composed of glycerol, a phosphate group, and two fatty acid chains. Glycerol is a three-carbon molecule that functions as the backbone of these membrane lipids.

What causes black holes to form?

Answers

Most black holes form from the remnants of a large star that dies in a supernova explosion. (Smaller stars become dense neutron stars, which are not massive enough to trap light.) ... When the surface reaches the event horizon, time stands still, and the star can collapse no more - it is a frozen collapsing object.

Which statement best describes scientists who contributed to the current body of scientific knowledge?
A. they were made up of men and women throughout history of different countries
B. they were mainly ancient philosophers whose theory stood the test of time
C. they were mainly from European countries such as England and France
D. they were wealthy men during the 20th century ​

Answers

Answer:

A

Explanation:

Answer:

A

Explanation:

On a cellular level, why do we need to breathe?

a
Our cells need oxygen
b
Our cells need glucose
c
Our lungs are empty
d
Our cells need carbon dioxide

Answers

Answer:

A. Our Cells need Oxygen

what is pathogen????​

Answers

Pathogen is kinda disease, virus, bacteria or other microorganisms ( which can cause disease)

Answer:   A pathogen is usually defined as a microorganism that causes, or can cause, disease :)

Explanation:

There are different types of pathogens, but we're going to focus on the four most common types: viruses, bacteria, fungi, and parasites.

why would a light wave speed up if it moved from air into hydrogen

Answers

"Mr. Bombastic, tell me fantastic. Touch me
na me back. She says I'm mister r00000-
mantic, call me fantastic. Touch me na me
back. She says I'm Mr. Ro- Smooooth" - Biggie
Cheese

The network of connective tissue fibers which pass through the tissues of the body and allow for the efficient movement of immune system cells is the

Answers

Answer:

reticuloendothelial system

Explanation:

The reticuloendothelial system (RES) is a heterogeneous population of phagocytic cells in systemically fixed tissues that play an important role in the clearance of particles and soluble substances in the circulation and tissues, and forms part of the immune system.

the major chemical constituent of a cell, by weight, is

Answers

Answer:

Water

Explanation:

It is 70% of a cell's weight.

a condition in which the number of red cells or the amount of hemoglobin is below normal

Answers

Answer:

The condition is anemia.

Explanation:

Anemia is a medical condition in which the red blood cell count or the hemoglobin is less than normal.

7. Where do the light-dependent reactions take place?

Answers

Answer:

in the chloroplasts I think that's how u spell it

Multiple choice please help!

Answers

Answer:

A=T is the answer ..............

Answer:

The correct answer is A) A=T

Explanation:

What best explains the relationship between photosynthesis
Оа
The higher the rate of formation of products in respiration, the lower the rate of photosynthesis.
Photosynthesis depends on the carbon dioxide released during cellular respiration.
Ob
О с
C
Cellular respiration depends on the water released during photosynthesis.
C
They have the same set of product molecules,

Answers

Answer:

 I think it's the last one! "They have the same set of product molecules"

Explanation:

Photosynthesis removes carbon dioxide from the atmosphere, and cellular respiration puts it back. Photosynthesis releases oxygen into the atmosphere, and cellular respiration uses that oxygen to release energy from food.

Which of these will be the best for a jungle environment

Answers

I think answer choice B, I believe its a black panther

How long do scientists estimate that the sea has been at its current level?
250 years
2,500 years
25,000 years
250,000 years

Answers

Answer:

250,000

Explanation:

Answer:

A. 250 years

Explanation:

NASA measures sea level around the globe using satellites. The Jason-3 satellite uses radio waves and other instruments to measure the height of the ocean's surface – also known as sea level. It does this for the entire Earth every 10 days, studying how global sea level is changing over time.

What three things might influence a slide when conditions are right? What types of material can make up a flow? (Site 1).

Answers

A slide can be influenced by friction, weight, and the angle of the slope. The materials that form flow generate less friction depending on the environmental conditions.

A slide is a movement that occurs when a fragment of soil/rock suddenly moves down a slope.

Slope stability is a factor influenced by the angle of the slope and the strength of the materials (e.g., rocks) on it.

The slide movement can ultimately be considered as a battle between friction versus gravity.

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TIME REMAINING
40:27
What must happen before a chemical reaction can begin?
The activation energy must be exceeded.
The activation energy must be reached.
The concentrations of products and reactants must be equal.
The concentration of reactant molecules must be reduced.

Answers

Answer:

A

Mark me as brainliest ONLY if my answer is correct

I apologize if my answer is incorrect I will better my answering strategies if it is incorrect.

Explanation:

A - the activation energy is the minimum energy needed for the reaction to take place

is the DNA in the form of chromatin or chromosomes when a cell finished cytokinesis

Answers

Answer:

Cell cycle consists of interphase and mitosis. During interphase there are 3 phases- G1, S and G2 phases. G1 is the resting phase after previous mitotic phase, S phase is DNA synthesis phase and G2 phase is again resting phase.

DNA synthesis occurs before mitotic phase which is the actual cell division phase and chromosomes are condensed during mitotic phase therefore it's in the chromatin form that DNA is synthesised.

Explanation:

Have a great day!

!!!!NEED HELP ASAP ILL GIVE BRAINLIEST AND 25 POINTS!!!!! How do proteins help transport of materials through the membrane?

Answers

Answer:

Channel proteins can aid in the facilitated diffusion of substances by forming a hydrophilic passage through the plasma membrane through which polar and charged substances can pass.

Explanation:

Answer: By forming a continuous protein pathway across the membrane, these proteins enable specific hydrophilic solutes to cross the membrane without coming into direct contact with the hydrophobic interior of the lipid bilayer. Carrier proteins and channel proteins are the two major classes of membrane transport proteins.

21. Explain How did Earth's environments change
from the Neogene to the Quaternary Period?

Answers

Answer:

Climate change and the developments it spurs carry the narrative of the Quaternary, the most recent 2.6 million years of Earth's history. Glaciers advance from the Poles and then retreat carving and molding the land with each pulse. Sea levels fall and rise with each period of freezing and thawing.

Explanation:

the codon read using the genetic code to determine the amino acid is found in the

tRNA, mRNA, rRNA or DNA
helpp!!!!!!!!!!!

Answers

Answer:

tRna and mRna

Explanation:

tRna and Mran

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Abigails family was going on vacation. They decided to rent a jet ski. When they went to rent the jet ski, they had to pay a $40 deposit and then $35 an hour. Which equation could be used to calculate how many hours they rented the jet ski if they ended up paying a total of $145.A. 145 + 35x = 40B. 35x = 145 + 40C. 35x - 40 = 145D. 40 + 35x = 145 If a nonzero net force is acting on an object, then the object is definitely _____.a. at restb. being acceleratedc. moving with a constant velocityd. losing mass. can anyone please help? I'm stuck on this problem Which of the following is true about the Renaissance patrons in France? a. Queen Catherine dMedici renovated a castle in the Italian style. B. Francis I started to renovate royal properties to reflect his interest in the Italian Renaissance. C. Francis I was a great French patron of the Italian Renaissance. D. All of the above are true. Please select the best answer from the choices provided A B C D. PLEASE FAST LAST QUSTION NEED ANSWERSelect the correct answer.Read this excerpt from an essay. What is the authors main purpose?My first day of high school was a total nightmare. I will never forget that day. I was a skinny, freckled, 14-year-old nobody. I just wanted to blend in, but I somehow spent the entire day being noticed for the wrong reasons. I messed everything up. I forgot my books. I went to the wrong classes. So when I went to the wrong lunch session and ended up in a room full of seniors, I wasnt surprised. Luckily, someone came to my rescue. Sensing my anxiety, one girl pointed out that I was lucky to be lost in that room because it was the meeting place of the schools new Community Service Council. She volunteered to take me to the food court and told me to ask her if I ever needed help. Beneath the red, white, and blue school banners, I watched her skip away to help another boy who had dropped his tray. Apparently, I wasnt the only one having a bad day. The Community Service Council ended up having a huge effect on my high school life. I just wish I could have found it in a less embarrassing way.A. to inform readers about a normal day at high schoolB. to persuade readers to join the Community Service CouncilC. to entertain readers with a funny story about the first day of schoolD. to express an opinion about the importance of community service If the measure of one angle of an isosceles triangle is 60degree then the triangle is What is the difference between emphysema and asthma?Emphysema is an inflammation of the lungs, while asthma is a bacterial infection of the lungs.Emphysema is the gradual destruction of the alveoli, while asthma is a sensitivity to irritants that causes the airway to constrict.Emphysema is a sensitivity to irritants that causes the airway to constrict, while asthma is the gradual destruction of the alveoli.Emphysema is a bacterial infection of the lungs, while asthma is an inflammation of the lungs. Which types of plant cells does glucose originate Filtration of wastewater flowing over a surface of land with vegetation and water is aan artificial wetlanda stabilization ponda biodegradable treatmentan open aeration pond who imposed the stamp act The following information has been obtained from the Myers Corporation: 300,000 shares of common stock were outstanding on January 1, 20X1. 50,000 stock options were outstanding on January 1, 20X1; each option allows the holder to acquire one share of common stock for $20 per share. The average market price of the common stock during 20X1 was $25 per share. 48,000 shares of common stock were issued on February 1, 20X1. 18,000 shares of common stock were purchased on August 1, 20X1. What is the weighted average number of shares to be used in the calculation of diluted earnings per share for 20X1 What is a main purpose of a novel? A reaction that had two compounds as reactants and two compounds as products is most likely a how did natural barriers such as the himalayan mountains hurt ancient china? There are 14 European cities that Sam would eventually like to visit. On his next vacation, though, he only has time to visit 3 of the cities: one on Monday, one on Tuesday, and one on Wednesday. He is now trying to make a schedule of which city he'll visit on which day. How many different schedules are possible? (Assume that he will not visit a city more than once.) escribe ONE way that the use of rodenticides affects the kit fox population AND explain how the size of the kit fox population is affected. The number line shows the graph of an inequality:A number line is shown from negative 5 to positive 5 with increments of 0.5. All the whole numbers are labeled on the number line. An empty circle is shown on the seventh mark to the left of 0. The region to the left of the empty circle is shaded.Which statement explains whether 4.5 can be a value in the shaded region? (5 points)No, it cannot because 4.5 lies to the left of 3.5.No, it cannot because 4.5 lies to the right of 3.5.Yes, it can, because 4.5 lies to the right of 3.5.Yes, it can, because 4.5 lies to the left of 3.5.If you get the best answer I will mark you as brinitlylistif 2 people answer Find the area of the triangle ASAP answer this pleaseas percentages All of the following changed the American prairie except :a . barbed wire b . extermination of the buffalo c . heavy rain falls d . windmills and irrigation HELP PLEASE DOING A TEST !