How long did the earth exist before life appeared on it?


A. 1 billion years

B. 1.5 billion years

C. 2 billions years

D. 2.5 billion years

Answers

Answer 1
Your answer is C: 2 billions years! Hope that helps!

Related Questions

At night, the concentration of carbon dioxide in the air in a forest is high. What is the main reason for this?

Answers

Answer:

The main reason the concentration of carbon dioxide in the air in a forest is high is due to the increase in plant growth.

Explanation:

Plants release carbon dioxide because of the process of respiration in which plants take in oxygen and give out carbon dioxide. During the day, carbon dioxide enters through the tree's pores, making oxygen escape (and is consistent with the “reverse lungs” concept).

On the other hand, at night, oxygen enters through the pores, and carbon dioxide escapes, rather than oxygen.

The main reason that the concentration of carbon dioxide in the air in a forest is high as there is only respiration going on at night and no photosynthesis.

What is plant respiration?

While oxygen is needed for plant respiration, carbon dioxide is also released during the process. Plants, unlike people and other animals, don't have any specific structures for the exchange of gases, but they do have stomata (found in leaves) and lenticels (found in stems) that play a part in it. Compared to people and animals, leaves, stems, and plant roots breathe air slowly.

Respiration is distinct from breathing. Breathing is a phase in respiration that is completed by both humans and animals. Plants breathe differently through a process called cellular respiration, which they engage in throughout their whole existence since the plant cell needs the energy to survive.

Plants produce glucose molecules during this cellular respiration process by using photosynthesis to absorb solar energy and transform it into glucose. Several real-world experiments show that plants can breathe. To provide their cells the energy they need to function and stay alive, all plants breathe.

Therefore, only respiration occurring at night is the reason for a high concentration of carbon dioxide in the forest air at night.

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Please help me
Which of these statements correctly describes one way that asexual and sexual reproduction are alike?
A. Both types of reproduction require two parents to produce offspring.
B. Both types of reproductions result in offspring that are identical to one parent.
C. Both types of reproduction enable genetic information to be passed from parent to offspring.
D. Both types of reproduction can occur in all organisms, depending on environmental conditions.

Answers

C. Both types of reproduction enable genetic information to be passed from parent to offspring.

It doesn't matter if the reproduction is sexual or asexual, because the offspring has the parent(s) dna and genetics either way.

The primary similarity between sexual and asexual reproduction is that they both have as their primary goal the generation of progeny into which genetic information is passed on, hence option c is correct.

What is the difference between asexual and sexual reproduction?

Asexual reproduction only requires one organism to create more offspring that are identical to the parent and each other.

A male and female cell combine during sexual reproduction to create children that are genetically distinct from their parents.

Sexual reproduction needs both a male and a female organism, as opposed to asexual reproduction, which only includes one organism.

Therefore, the benefits of sexual reproduction include the offspring's genetic diversity, hence option c is correct.

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How do humans regulate water levels in the body?​

Answers

Answer:

Body water homeostasis is regulated mainly through ingested fluids, which, in turn, depends on thirst. Thirst is a sensation created by the hypothalamus, the thirst center of the human body.

Explanation:

An arid climate with high annual temperatures would most likely be found in what
Earth location?

Answers

Answer:

Explanation:

north of the tropical climate zone in the Northern Hemisphere, and south of the tropical zone in the Southern Hemisphere.

Answer:

Atacama Desert in Chile

Explanation:

The Atacama Desert in Chile is known as the driest place on Earth. It averages 0.04 inches of rain each year.

identify one hormone present in a female that is involved in regulating the reproductive cycle? ​

Answers

Answer: The hormones controlling the female reproductive system include gonadotropin-releasing hormone (GnRH), follicle-stimulating hormone (FSH) and leutenizing hormone (LH), all of which are produced in the brain; oestrogen and progesterone produced by the ovaries and the corpus luteum; and human chorionic gonadotropin (HCG

Choose the correct statement below.

A: Sea breezes occur during the daytime as wind blows from the land toward the sea.


B: Sea breezes occur during the daytime as wind blows from the sea toward the land.


C: Sea breezes occur during the nighttime as wind blows from the land toward the sea.


D: Sea breezes occur during the nighttime as wind blows from the sea toward the land.

Answers

Answer:

During the day, the sun heats up both the ocean surface and the land. ... The wind will blow from the higher pressure over the water to lower pressure over the land causing the sea breeze. that above is showing the answer so the answer is B

Explanation:

which method of food preservation is good in preserving fruits?​

Answers

Answer:

Canning

Food Preservation Methods: Canning

Canning is a popular way of preserving fruits, vegetables and meats. Both cans and glass jars are suitable for canning. The important thing will be to sterilise your equipment in simmering water for a few minutes (this includes lids).

Explanation:

hope it was helpful

is ethane an elementary substance or compound?

Answers

Answer:

Ethane is a chemical compound

Explanation:

Which of these mineral properties cannot be used to identify a mineral

1.mass
2.luster
3.streak
4.hardness

Answers

Hardness, hope this helps

The mineral property which cannot be used to identify a mineral is: 1. mass

A mineral refers to any form of naturally occurring, inorganic solid substance that is typically characterized by a crystal structure.

This ultimately implies that, minerals are homogeneous in nature with a well-defined chemical composition and they are characterized by a crystal structure comprising ions, atoms, or molecules arranged in an orderly manner.

Generally, the mineral property which can be used to identify a mineral include the following:

Luster.Hardness.Streak.

For example, hardness of a mineral can be tested by scratching its surface with a knife or your nails.

However, mass isn't a mineral property that can be used to identify a mineral.

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The
is the matter through which a surface wave travels.

Answers

Your answer is going to be medium

*ANSWER ASAP!! YOULL GET 11+ POINTS*

How are marine worms and sponges different?

a.) Sponges live in mud, sand, or underneath rocks.

b.) Marine worms exist in more than one phylum.

c.) Marine worms are invertebrates.

Answers

Answer:

Segmented marine worms are easily identified by the many visible rings that make up their bodies. Many marine species are found on the sea bottom but are not restricted to it. Sponges are filter-feeding, colonial animals which live together as a larger unit. They appear to be plants but are in fact invertebrate animals. So the answer is (A.) I think.

Filter-feeding colonial organisms, sponges live as a single bigger group. Although they seem like plants, they are actually invertebrate animals. Thus, option A is correct.

What are the different features in worms and sponges?

Bilateral symmetry describes how all worms have the same body on both sides. They lack scales and real limbs, even though they might have appendages like fins and bristles.

Each of them belongs to a different phylum, and each phylum is very diversified. They all have the trait of being primitive, basic biological creatures.

Segmented saltwater worms are easy to identify because of their body's many distinguishable rings. The sea floor is home to many marine creatures, but this is not the only place they may be found.

Therefore, Sponges live in mud, sand, or underneath rocks.

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Your grandparents are at your house visiting for the holidays and are asking questions pertaining to the weather in your area. What
question might they ask you?

Answers

Answer:

b

Explanation:

Answer:

B- Do you think it will rain tomorrow?

Explanation:

I don’t wanna get a bad grade can someone tell me which ones are wrong and which are right

Answers

Answer:

i think number 11 is Carnivore

Study the graph and then complete the passage. 425 8.33 400 Atmospheric CO2 (ppmv) Seawater pCO2 (uatm) Seawater pH 8.28 375 8.23 CO2 350 8.185 PETITE 325 8.13 300 8.08 275 1955 1965 1975 1995 2005 8.03 2015 1985 Year The graph shows data collected near the Mauna Loa volcano in Hawaii from 1955 to 2015. The data includes atmospheric CO2 levels, seawater CO2 concentrations, and seawater pH readings. If the current trend continues, the seawater near Mauna Loa will likely become more alkaline due to the changing concentration of in the water.​

Answers

Answer:

First blank: MORE ACIDIC

Second blank: CARBON DIOXIDE

Explanation:

GOT IT RIGHT IN PLATO

Answer:

more acidic

carbon dioxide

Explanation:

took the test got it right

Grasslands are a very
different
ecosystem than a
wetland. What ecosystem services do you think a
grassland might provide for people?

Answers

Answer:They may be lacking rain, but are really good places for herding animals.In this way, they are helping a lot of farmers that herd animals.

Grasslands are a very different ecosystem than a wetland. They may be lacking rain, but are really good places for herding animals. In this way, they are helping a lot of farmers that herd animals.

What is ecosystem?

An ecosystem have each as well as every organism and the relation between the physical environment by which they must interact. The function of the ecosystem has to satisfy the need of the humans by supplying them services as well as goods from the nature.

Ecosystem has been the branch of the science which has deals with the study of the relationship between the living organisms and the natural phenomena. Ecosystem has the system in which the both living as well as nonliving organisms are present in the particular location.

There has been various types of the ecosystem such as the Grassland ecosystem, Tundra ecosystem, Desert ecosystem, Forest ecosystem and many more type of ecosystem is present in the environment.

Therefore, Grasslands are a very different ecosystem than a wetland. They may be lacking rain, but are really good places for herding animals. In this way, they are helping a lot of farmers that herd animals.

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Organisms that can capture the sun's energy and store it.

Answers

Answer:

Plants, algae and bacteria. They are called autotrophs

Explanation:

Answer:

cyanobacteria

Explanation:

The Sun is the major source of energy for organisms and the ecosystems of which they are a part. Producers such as plants, algae, and cyanobacteria use the energy from sunlight to make organic matter from carbon dioxide and water.

hope it helps

What is the name for the total energy of all the particles in a substance?
ull 2 Laux, Jason
A
mechanical energy
B
thermal energy
С
potential energy
D
chemical energy

Answers

The answer is thermal energy.

pls help its easy 6th grade science one question

Answers

Answer:

C. Electromagnetic energy is transformed into chemical energy

Explanation:

Plants are capable of producing its own food and use energy from sunlight. Light energy is a part of electromagnetic energy.

What is the best way to describe heat transferring from one end of a metal pole to the other

Answers

Answer:

If one end of a metal rod is heated, the other end also gets heated up. This is due to conduction. When one end of a metal rod is heated, the kinetic energy of the molecules at that end increases.

Explanation:

what does flora and fauna means​

Answers

Answer:

Flora and fauna refer to plants and animals in the broadest sense of the words, encompassing pretty much all life on Earth.

I hope it's helpful!

During meiosis, a parent cell having four chromosomes will produce sex
cells, each containing:
a) two chromosomes

b) four chromosomes

c) eight chromosomes

d) sixteen chromosorkes

Answers

The answer is B. Have a nice day :)

Which of the following is a true statement about the worlds energy resources?

Answers

Answer:

b

Explanation:

Which of the following is not true about Australopithecus africanus?
A) Had a larger brain than the modern chimpanzee
B) Teeth were smaller than the modern human
C) They walked upright
D) Found in the African savannah

Answers

Answer:

A

Explanation:

the brains of Australopithecus afarensis adults were roughly 20 percent larger than those of chimpanzees.

Australopithecus africanus was not found in the African savannah.

Australopithecus africanus

The Africanus had a larger brain and smaller teeth. It had ape-like features like long arms, sloping face.

The shape of this pelvis proved Australopithecus africanus was able to walk upright on two legs.

Australopithecus africanus is an extinct species that lived in the Middle Pliocene to Early Pleistocene of South Africa.

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state five ideal conditions required for microbial activity in the ruminant stomach​

Answers

Answer:

You can find answers on Ggle

What are some examples of inhibitory proteins?

Answers

Answer:

Explanation:

proteins that regulate chromatin remodeling also affect the cell cycle, the ADNP gene; proteins that inhibit cellular energy metabolism also inhibit the cell cycle, ALDH1L1; proteins that inhibit cancer cell growth and chromatin condensation can also act as cell cycle inhibitor proteins.

I hope this helps you

what substances must a plant take substances come from

Answers

Answer:

carbon dioxide,water,sunlight,chlorophyl

Similarities of newspapers and images​

Answers

Answer:

They both tell a story. Newspaper tell a story through text and then add a picture for more explanation. While, images tell a story by just looking at them kit Coul be something historical, a love story, an image from a movie...)

Explanation:

By both of them we see the story but in newspapers it will be in text

And in images by seeing pictures we can understand

me that causes the testes to produce sperm
22 The
Urethre
of the ele reproductive
cre the procuction of sera ens the transfer of sperm
3. Preejecutory
Fluid
to the fencle's bocy during intercourse
_3 Twe small siends that produce sperm
pe
4. The see thet held the testes. It keeps the testes cwcy from
C. Circumcision
D. Functions
the men's body se the temperature of the sperm stey low enough
for survivel
Já The here of the serm contains the nucleus and the tail of the E Tadpole
Da The tubes in each testis join the larger coiled tube. It is located F. Serinel Vesicles
et the outer surface of each testis, and stores sperm temporerily.
Ez A tube that extends from the lower end of each epididymis and 6. "Wet Dreams
connects with the urethre
__8. Slendisebout 2 inches long and cre attached to the ves deferens H Cowper's gland
near the bese of the bladder.
9. A gland that surrounds the urethra in men
I Testosterone
10. Glend which is located below the prostate gland
J. Scrotum
11 Sperm (from the seminal vesicles) and fluid secreted from the K Prostate gland
cowper's gland and prostrate gland.
12 A small tube that extends from the bladder as well as from each L Penis
ves deferens through the penis to the outside of the body.
13. A
near the bladder contracts, preventing urine M. Foreskin
from entering the urethra when semen is present.
N Testes
14. Secretion that causes a small drop of clear fluid to leave the
penis before semen comes out.
0. Ves deferens
15. The external reproductive organ composed of spongy tissue
That contains many blood vessels.
P. Semen
_16. When semen pesses through the urethra and passes outside the
penis.
Q. Ejaculation
_17. An erection and an ejaculation during sleep.
REpididymis
__18. A fold of skin at the tip of the penis.
S. Muscle
19. When the foreskin is surgically removed after the baby is born.

Answers

Answer:

Testosterone is a major part of puberty in boys, and as a guy makes his way through puberty, his testicles produce more and more of it. Testosterone is the hormone that causes boys to develop deeper voices, bigger muscles, and body and facial hair. It also stimulates the production of sperm.

Explanation:

Need help with the question

Answers

Answer:

plant cells

Explanation:

The correct chemical formula for magnesium sulfide is
A) Mg2S

B) Mg3S4

C) MgS

D) MgS2​

Answers

The answer is C) MgS
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