How do index fossils help scientists?

How Do Index Fossils Help Scientists?

Answers

Answer 1

Fossils are used to determine the ages of rock layers. ... Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time. An index fossil allows a scientist to determine the age of the rock it is in.


Related Questions

Why do people gain weight ?

Answers

Answer:

Poor sleep, sedentary activities, and eating too many processed or sugary foods are just some of the habits that may increase your risk of weight gain. Yet, a few simple steps — such as mindful eating, exercise, and focusing on whole foods — can help you reach your weight loss goals and improve your overall health.

Explanation:

Why do sunspots appear as dark spots on the surface of the Sun?​

Answers

Answer:

I think it is because the sun has released energy and looses light in that area because of it.

Explanation:

Why do sunspots appear as dark spots on the surface of the Sun?

Answer: Sunspots are "dark" because they are cooler than their surroundings. ... Sunspots have a lighter outer section called the penumbra, and a darker central region named the umbra. Sunspots are caused by disturbances in the Sun's magnetic field welling up to the photosphere, the Sun's visible "surface".

Facts about the sun: The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy mainly as visible light, ultraviolet light, and infrared radiation. It is by far the most important source of energy for life on Earth.

Surface temperature: 5,778 K
Mass: 1.989 × 10^30 kg
Radius: 432,690 mi
Age: 4.603 billion years
Distance to Earth: 92.96 million mi
Spectral type: G2V
Moons: 3122 Florence, 90482 Orcus

what do the letters stand for please help me thank you

Answers

Answer:

D

Explanation:

Prophase

Metaphase

Anaphase

Telophase

These are stages in mitosis.

If an invasive species emigrated from a continent to a small island near the continent, what would most likely occur on the island

Answers

Answer:

Organisms on the island would migrate to a larger island.

Invasive species can cause extinctions, reduce biodiversity, compete for resources, and modify environments.

What is an invasive species?

An invasive species is a category of non-native species that has overtaken the habitat to which it was initially introduced.

Native plants and animals may go extinct as a result of invasive species, which can also decrease biodiversity, compete with native species for scarce resources, and disrupt habitats.

Preventative measures are the most practical and secure method of managing invasive species. It is far more effective to deal with invasive species early on and quickly than to try and contain an extensive infestation. The invasive species may be the target of control and management measures if eradication is not achievable.

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Read the following passage and answer the question.

“Never another master kind as he!

I’ll never find one – no matter where I go,

not even if I went back to mother and father,

the house where I was born and my parents reared me once.

Ah, but much as I grieve for them, much as I long

to lay my eyes on them. Set food on the old soil,

it’s longing for him, him that wrings my heart –

Odysseus, lost and gone!

That man, old friend, far away as he is…

I can scarcely bear to say his name aloud,

so deeply he loved me, cared for me, so deeply.

Worlds away as he is, I call him my Master, Brother!”

Which theme is being expressed in this passage?

hospitality
temptation
pride
loyalty

Answers

Answer:

it's like two theme there

Explanation:

hospitality or loyalty

SCIENCE

Which seafloor feature is an example of an abyssal plain?​

Answers

Answer:

mid-ocean ridge

Ocean trenches

After scaling the mid-ocean ridge and traversing hundreds to thousands of miles of abyssal plains, you might encounter an ocean trench. The Mariana Trench, for example, is the deepest place in the ocean at 36,201 feet

Explanation:

please mark me brainliest and i think it is c

The answer is Ocean trenches

The diagram shows the reproductive system of a plant.



Which of the following best describes the interaction that occurs between a plant's reproductive parts during self-fertilization?


The diagram shows the reproductive system of a plant.



Which of the following best describes the interaction that occurs between a plant's reproductive parts during self-fertilization?


Pollen is released from the stigma and is transferred to the anther. A pollen tube grows down from the anther through the filament and fuses with the ovule, where the sperm fertilizes the egg.


Pollen moves from the ovule up through the style and is released from the stigma. The pollen is transferred to the anther, where the sperm fertilizes the egg.


Pollen is released from the anther and is transferred to the stigma. A pollen tube forms and grows through the style. The pollen tube reaches an ovule within the ovary where the sperm fertilizes the egg.

Answers

Pollen is released from the anther and is transferred to the stigma. It's the 3 rd answer that is correct

The correct answer is pollen is released from the anther and is transferred to the stigma. A pollen tube forms and grows through the style. The pollen tube reaches an ovule within the ovary where the sperm fertilizes the egg.

This option correctly defines the interaction that occurs between a plant's reproductive parts during self-fertilization as it explains the pollination process and fertilization, when pollen grains are released then are transferred to the stigma the pollen tube is there that reaches ovule and the sperms fertilize an egg.

What is pollination?

Transfer of pollen from anther to the stigma of plants. Pollen is released from the anther and is transferred to the stigma. A pollen tube forms and grows through the style. The pollen tube reaches an ovule within the ovary where the sperm fertilizes the egg.

Thus it is clear that the answer explained above is correct describes the interaction that occurs between a plant's reproductive parts during self-fertilization.

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How have golden eagles adapted their behavior for living in temperate grasslands?

Answers

Golden eagles have adapted their behavior for living in temperate

grasslands by building their nests on the ground.

Temperate grassland is characterized by mainly grasses and very few

trees. Animals like the Golden eagle who build their nests on tall trees are

able to adapt to the absence of these types of trees in the grasslands by

building their nests in the ground.

They live in in pairs in the temperate grasslands to efficiently guard the

nest and hunt  animals for their survival.

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you can find a nucleus in the cells of

Answers

Eucariotec like red blood cells and others
Procariote is like bacteria or amiba

Which statements accurately describe atoms? Check all that apply.

1.Atoms cannot be divided.
4.Atoms were named in the fifth century BCE.
5.Atoms are the smallest unit of matter.

Answers

Answer:

5

Explanation:

5.Atoms are the smallest unit of matter.

Answer:

atoms are the smallest unit of matter

Explanation:

atoms CAN be divided into 2 halfs and ther were names AFTER bce

What does the receptor protein do?

stops things from entering into cell

helps cell self destruct when necessary

Receives chemical signals from the brain.

helps the flow of blood

Answers

Answer:

the answer is Receives chemical signals from the brain.

Explanation:

i took the quiz have a good day

Definition Of polar molecules and nonpolar molecules please?​

Answers

Answer:

Non polar molecules are symmetric with no unshared electrons. Polar molecules are asymmetric, either containing lone pairs of electrons on a central atom or having atoms with different electronegativities bonded.

Explanation:

When things are different at each end, we call them polar. Some molecules have positive and negative ends too, and when they do, we call them polar. If they don't, we call them non-polar. Things that are polar can attract and repel each other (opposite charges attract, alike charges repel).

Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.

Hi !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1

Answers

Answer:

Hiya how ya doing?? :D

Explanation:

have a miraculous day everyone!!! <3

Hello how are you doing today answer is 15

. During reproduction, a sperm cell fertilizes an egg cell. The newly formed
embryo then undergoes mitosis as it develops. The cells of the organism
differentiate in order to perform different functions for the organism.
The reason different cells perform different functions is that they -

Answers

Are coded by DNA to do their tasks.

Arable land is land is no longer able to promote growth of agricultural changes.

True
False

Answers

The answer is false

Answer:

False

Explanation:

I took the test

please help meeèe I really need urs help ​

Answers

Explanation:

Science and technology help each other advance. Scientific knowledge is used to create new technologies. New technologies often allow scientists to explore nature in different ways and make new discoveries. Examples of technologies that have helped science advance include the telescope and microscope.

how could knowledge of a pest organisms tolerance limits be used in pest control

Answers

Answer:

Explanation:

With the knowledge of knowing the organism's tolerance you could learn how to better kill them and get rid of them. For example for bed bugs poisons did not work but they realized extreme cold temperature did so they now freeze them.

The brightness of a star depends on the amount of light energy coming from the star.

Which factor also affects the brightness of a star in the sky?


the amount light shining on the star


the distance of the star from Earth


the season of the year on Earth


the number of other separate stars seen around it

Answers

Answer:

Three factors control the brightness of a star as seen from Earth: how big it is, how hot it is, and how far away it is. Magnitude is the measure of a star's brightness. Apparent magnitude is how bright a star appears when viewed from Earth.

Explanation:

Answer:

the amount light shining on the star

Explanation:

9. When a scientist makes a proposal of a cause-and-effect relationship between two variables, this
statement is called a
a. Conclusion.
O b. Fair test
C. Theory
O d. Hypothesis

Answers

Answer:

You should try d. Hypothesis as answer

Answer:

D

Explanation:

A hypothesis states a presumed relationship between two variables in a way that can be tested with empirical data. It may take the form of a cause-effect statement.

You are a red blood cell in the LEFT VENTRICLE of the heart. In the correct sequence, which blood vessels must you pass through in order to get down to the RIGHT wrist (the palmar arches)?

Answers

The correct sequence of blood vessels that must be passed to get to the Right wrist is :

From the Left ventricle --> Aorta ------> Brachiocephalic artery ------> Right subclavian artery -----> Right axillary artery -----> Right brachial artery-------> Right ulnar and radial arteries -----> Right wrist .

The Aorta is the first passage( blood vessel) of the oxygenated blood, pumped out of the left ventricle of the heart, It forms an arch through which other arteries like Brachiocephalic artery originates to distribute blood to the upper parts.

The right subclavian, axillary and brachial all supply blood to the right arm while the Right brachial artery further divides into Right Ulnar and radial arteries.

Hence we can conclude that The correct sequence of blood vessels that must be passed to get to the Right wrist is :

From the Left ventricle --> Aorta ------> Brachiocephalic artery ------> Right subclavian artery -----> Right axillary artery -----> Right brachial artery-------> Right ulnar and radial arteries -----> Right wrist .

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nvmhhudd<uldjddhssh?_______

Answers

Answer: nvrmndllhddy = wldjddpshh

Cancer is the uncontrolled growth of abnormal cells in the body. What can cause cancer to develop?
 Group of answer choices

A Disruption of the cell cycle

B Synthesis of a repressor protein

C Turning off genes during differentiation

D Structural genes that are active

Answers

Answer:

A

Explanation:

Disruption of the cell cycle means that cells can divide without order and accumulate genetic errors that can lead to a cancerous tumor.

What is the haploid number for the Tasmanian devil?

Answers

Tasmanian devils have 14 haploid chromosomes

What is most likely the identity of the biome, and why?

Answers

Answer:

The primary factor which determines a biome is the climate. Temperature and precipitation essentially determines what kind of growing season or soil quality the terrain may have,which therefore affects the growth of plants living there.

Other factors may include: humidity, pollution (such as air, noise...), daylight intensity

Explanation:

can we get more context

In the series of words given below, which of the following words is not categorized with the others?
superstructure - supervene - superstar - Supemova - supertanker
Select the single best answer:
e
A. superstructure
B. supervene
C. superstar
D. supernova
E supertanker

Answers

Answer:

I think its supernova

Explanation:

the choices a b c and e are all something more of something that exists. Ex) Super star is a star that is Super! But a Supernova is just a Supernova. There is no nova that is Super.

I hope this helps.

Supernova is the series of words given below, which of the following words is not categorized with the others.

What is Supernova?

A star that has reached the end of its life and bursts in a bright flash of light is what is known as a supernova.

Supernovae have the ability to briefly outshine entire galaxies and emit more energy in a single second than the sun does in its entire lifetime. Additionally, they are the universe's main supplier of heavy materials. Supernovae are "the greatest explosion that occurs in space," according to NASA.

Supernovae were noted by numerous cultures before the telescope was created in the 17th century. According to NASA's records, this "guest star" was visible in the sky for eight months.

Therefore, Supernova is the series of words given below, which of the following words is not categorized with the others.

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Which of the following correctly describes the structural arrangement of the cell membrane?

Answers

Answer is number 56

Which is a step in the convection cycle in the Earth's atmosphere

Answers

Answer:

Hot, less dense air rises, whereas cold air drops, because the air molecules clump together

Explanation:

Hope I helped! ;)

Is grass a living thing

Answers

why yes it is

my proof : Plants are living because they grow, take in nutrients and reproduce. Trees, bushes, a cactus, flowers and grass are examples of plants. Plants are also living things. Plants are living because they grow, take in nutrients and reproduce.

Select the letter of the most appropriate answer.
examples include base substitutions and deletions
person who has one recessive allele for a recessive genetic disorder
type of DNA used to prepare a DNA profile
continuing process by which all organisms on earth now share the same genetic code
genes contain the coded instructions to manufacture __________
custom genes that can be inserted into other DNA strands
genes on this chromosome were used to determine the ancestry of Sally Hemings' descendants
combined DNA from multiple sources
genetic analysis used to trace the ancestry of all humans from Africa
method of cleaning up environmental; pollution with GM organisms
new genetic editing technology that uses small pieces of RNA to find specific locations in the DNA strand
A. Amino Acids
B. Bioremediation
C. Carrier
D. CRISPR
E. Evolution
F. GM Organism(s)
G. Mitochondrial DNA
H. Point Mutation(s)
I. Protein(s)
J. Recombinant DNA
K. Non-Coding DNA
L. Transgene
M. X Chromosome
N. Y Chromosome

Answers

Genes contain the coded instructions to manufacture A: Amino Acids.

DNA inside of genes gives the blueprint for rna to go to ribosomes. Ribosomes then produce amino acids.

Hope this helps!

please help me i never done this before and it’s confusing me i’ll give 100 points + brainlist

Answers

Answer:

A,E,D,B,C

Explanation:

first pic is A

second pic is E and go on ...

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Why are developing countries experiensing rapid population growth while developed countries are growing slowly or not at all? Identify whether each writing practice is correct ( / ) or not ( X ).1. Decide on a topic that you are the only one who understands and appreciates.2. Do extensive research online and in the library.3. Prioritize sources that are instantly available to you as not to waste time.4. Always stay on a neutral side in your persuasive speech.5. Make three strong points and never go beyond that.will mark brainliest if answer. [-4,6)Write the interval as an inequality. In the late 19th century, which of the following reasons suggested that the United States needed to expand? How can you tell from the equations, without graphing, how many solutions the system has? How many protons are in C-14? Sebastian compares toy car prices at three different store so he can get the best deal for his little brother's Christmas gift. a. Toys R Us 5 cars for $6.25b. Walmart 10 cars for $12.64C. Target-2 cars for $2.76Which store has the best unit rate? I need halp plz, no incorrect What is the range of this graph? what is the exact circumference of the circle? A. 10 FT B. 20 FT C. 40 FT D. 60 FT Write a letter to the Editor of Times of India voicing your concern about the rash driving of the bus drivers. [Hints : Dangerous driving, unsafe for passengers and pedestrians, stricter measures to be taken by RTA Road Transport Authority such as fines and suspension rewarding safe drivers cause of accidents] HELPHOW AM I MEANT TO ANSWER THIS QUESTION I WOULD ASO LIKE ANSWER.THX (1 point)1. Which of the following describes how Spanish explorers affected Native American cultures inthe American Southwest?O The Spanish shared their wealth and goldO The Spanish converted Native Americans to Christianity.O The Spanish moved Native Americans to Mexico.O The Spanish brought Native Americans back to Spain, A rooster laid an egg on top of the barn roof. Which way did it roll?It didnt roll roosters dont lay eggs. antianxiety, antidepressant, or antipsychotic medications are most frequently prescribed by what was the pascaline used for? How many miles did Zheng he travel Pleaseeeeeeeeeee help me What trend are we seeing in terms of osteoporosis, heart disease, and high blood pressureO Decreased rates in the adult U.S. populationO Decreased rates in the young U.S. populationO Increased rates in the young U.S. populationO Increased rates in men, decreased rates in women when you are yeah then what happens when i love doing it for the when i was a little kids lol what is 1000-1?