What is a nebula?

the core of a massive star
a cloud of gas and dust in space
a swirling disk with a lot of gravity
the debris remaining after a supernova

Answers

Answer 1

A nebula can be defined as: B. a cloud of gas and dust in space.

What is a nebula?

A nebula can be defined as a cloud of gas and dust in space.

This ultimately implies that, a nebula is a low-density cloud of interstellar hot gas and dust such as:

HeliumHydrogen

Basically, a nebula is needed for the creation or formation of a star as follows:

An increase in the temperature at the center of a nebula causes the small nuclei of atoms to fuse.The nebula gets hotter and brighter as the nuclear fusion sets off a chain reaction while providing enough energy to turn the nebula into a star.

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Related Questions

The above graph shows vertebrate diversity in terms of total
number of species. Which of the vertebrate classes listed in
the graph would have the BEST chance of at least some of
the species surviving a major environmental change?

A:bony fish
B:birds
C:sharks, rays
D: mammals

Answers

Answer: a

Explanation:

Answer:

a

Explanation:

what is the difference beween respiration and breathing​

Answers

Answer:

Breathing: is the physical process of exchanging gases

respiration: is a chemical process that takes place at a cellular level and produces energy.

Look at the diagram of a euglena cell. Early scientists were not sure how to classify this organism.
What is one reason that it might be difficult to classify euglena?

Answers

Answer:

Since Euglena have features of both animals and plants, early taxonomists, working within the old two-kingdom system of biological classification, found them difficult to classify - not because they had features different from an animal and different from a plant, but because they had some features that were animal-like and some features that were plant-like.

Explanation:

How does ADH work to balance water in the bloodstream and urine??

Answers

Answer:

The kidneys can adjust the concentration of the urine to reflect the body’s water needs, conserving water if the body is dehydrated or making urine more dilute to expel excess water when necessary. ADH is a hormone that helps the body to retain water by increasing water reabsorption by the kidneys.

The reaction between methane and oxygen releases a lot of energy. What does this do to the temperature?

Answers

it’s exothermic so it gives off heat

Scientists sink concrete blocks in oceans to create artificial coral reefs. Which successive event most likely occurs first on this type of coral reef

Answers

Answer:P

Explanation:got it right

Coral polyps attach themselves to the surface to grow is the event most likely occurs first on this type of coral reef.

What is Coral reef?

Coral reefs are significant ocean habitats that make a strong argument for the dangers of climate change. Reefs are a significant contributor to the biodiversity of the planet; they have been referred to as "the rain forests of the seas." One of the most diverse environments on earth, coral reefs are home to 25 percent of all marine species, according to scientists.

According to Paulo Maurin, coordinator of education and fellowships for NOAA's Coral Reef Conservation Program, the reefs are essential to the biodiversity of our world.

Many fish species use them as fruitful nurseries, giving the young fish a place to live and an opportunity to develop, according to him. "The diversity of coral reefs is so great that we don't have a firm count of all the species that live there,"

Therefore, Coral polyps attach themselves to the surface to grow is the event most likely occurs first on this type of coral reef.

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On a warm day near the ocean, a breeze or wind often blows from the water to the land. Explain why this happens

Answers

Answer:

It occurs because of the difference in temperature between the ocean and the land.  

This happens because the land heats up faster than the water, causing the air to rise above the land and allowing cooler air from the ocean to move in and take its place.

What is sea breeze?

Because land and water have different capacities for holding heat, the land will heat up more quickly than the water on a hot day near the ocean. As a direct consequence of this, the air that floats above land tends to become warmer and less dense than the air that floats above water. Because of this, a region of low pressure is created over the land, while a region of high pressure is created over the water. In order to maintain a natural equilibrium, air will always move from areas of higher pressure to areas of lower pressure.

A breeze or wind that blows from the water to the land is caused by the air that is cooler and denser over the water moving towards the air that is warmer and less dense over the land. This phenomenon, which is referred to as a sea breeze, can assist in moderating temperatures on land, thereby making it feel more bearable and pleasant to be there.

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PLEASE HELP I AM STUCK ON THIS QUESTION

Answers

Answer:

(1) gravity

Explanation:

Gravity is what keeps planets and those planet's moons in orbit.

Answer:

1

Explanation:

electricity doesn't exist in space or between galaxies

friction can never be found in space because there's no rough surfaces

gravity pulls every object down to earth

AAAAAUGACCAAAGUGGAGUAAUGGUAACCC please type first 3 letters of each amino acid separated by a dash.

Answers

Answer:

what?

Explanation:

A cladogram is shown below. What is a derived characteristic that distinguishes the salamander from the perch? lungs claws or nails fur jaws

Answers

About the question:

You will a cladogram in the attached files.

Answer:

lungs

Explanation:

A Cladogram is a tree-type graph based on cladistic analysis. It represents the common ancestral relationships among the involved groups.  

• The tree-type graph is a ramified diagram that represents the relationship between the involved taxa.  

• The cladistic analysis follows the maximum parsimony criterium. Explains the character state from the point of view of the fewest changes through history. Explains evolution with the minimal amount of evolutive changes. It recognizes the monophyletic groups as natural groups. These groups are the clades, and their classification -sequencing- represents their phylogeny.  

• The sequencing term refers to lists of groups according to their relation. One group is the brother-group of the following one.  

So the cladogram represents the relationship between groups according to a derived character.  

The derived character is any trait that a group passes to the descendants. Through evolution, the characters change, and new changes are added. When referring to a derivate character, we mean that all the subsequent species in the cladogram carry the trait.

A cladogram provides an image of how new species keep characters that were inherited from older species.

In the attached cladogram, you can see that the lungs are the derived character that distinguishes the salamander from the perch.

Claws or nails separate salamander from lizards.

Fur separates birds and reptiles from mammals.

Jaws separate hagfish from perch.

Mutations occurred in evolution producing new traits, and these traits also appear in posterior groups. So, after the hagfishes emerged the jaws, and all the animals that followed the hagfishes have jaws.

Lungs appeared after the perch and before salamander, so salamander, and all the posterior animals, have lungs. And so on.

An increase in heart rate (your heart pumps faster) results in...

A. No changes to cardiac output or pressure
B. Increase cardiac output and high pressure
C. Increased cardiac output but lower pressure

Answers

Answer:

B

Explanation:

I believe that the answer is B

Which event came first? The age of reptiles Amphibians leave the water Trilobites are one of the dominant species on Earth Early humans arise on Earth​

Answers

Answer:

Trilobites are one of the dominant species on Earth

We know it's not D, the age of reptiles was just a "wee" bit before humans, and amphibians came after trilobites.

Answer

F1 development of the ozone layer

S2 sharks and trilobites abundant in oceans

T3 plants and animals colonize land

F4 dominance of reptiles >> dominance of mammals

Do this and I'll bark for you:)
(Just type out the info please)
Create a digital table with the subtitles Body systems. Function, Organs and be able to describe all 12 body systems. There are 3 organs that need to be listed.

Answers

Answer:

body systems include the skeletal, which supports and moves body and Protects internal organs Mineral storage Blood formation, nervous, which coordinates activities of other organ systems Responds to sensations, the muscular, Locomotion Heat production, the respiratory, which has a Oxygen/carbon dioxide exchange, the endocrine, which regulates body functions by chemicals (hormones), immune system, which is a complex network of cells and proteins that defends the body against infection, cardiovascular / circulatory, which will Transports oxygen and nutrients to tissues, and removes waste produce, the urinary, which will eliminate wastes and regulates pH and volume of blood, and the integumentary system, which is protecting the body from invasion by microorganisms, chemicals, and other environmental factors, and the reproductive, that produces germ cells (eggs and sperm), and is the Environment for growth of fetus (female) and digestive systems.

Some organs include The brain (controls center of the nervous system and is located within the skull), The lungs, you use to hold air in, then let out, The liver, that regulates most chemical levels in the blood and excretes a product called bile. The bladder, which holds urine, The kidneys, which is a very efficient filters for ridding the body of waste and toxic substances, and returning vitamins, amino acids, glucose, hormones and other vital substances into the bloodstream. The heart, which pumps blood and is protected by your skeletal system, The stomach, which will emit a special acid to help digest food before it goes to the intestines, and The intestines, which you use to digest your food.

hope this helps!

For this assignment, you will ask questions about the factors that have caused a rise in global
temperatures over the past century. Then, you will conduct research to answer your questions. You will
also graph provided information, analyze the graphs, and make conclusions based on the graphs. Finally,
you will write a paper describing the conclusions of your research and graphs.
Background Information
Global temperature change is a gradual increase in the overall temperature of the Earth's atmosphere.
Both human activity and natural processes have contributed to this temperature increase. Examples of
human activities include the burning of fossil fuels, cement production, and agricultural activity. Examples
of natural processes include changes in incoming solar radiation and volcanic activity.
Scientists present evidence for the rise in global temperature in the form of tables, graphs, maps, and
models. For example, scientists build climate models (computer simulations of climate systems) to
explore the causes and effects of global temperature change and to predict future trends. These models
predict that the Earth’s average surface temperature will rise as greenhouse gas concentrations continue
to rise. Based on these models, scientists predict that average surface temperatures could rise by
between 2°C and 6°C by the end of the 21st century.

All I need is the graph

Answers

My project is in the file attached, lots of thanks to Maxineishere for helping me with the essay. You may need adobe reader for this as the files are PDF files, I hope you are satisfied! :)

DATE ANSWERED: 5/8/2021

Name 5 invasive species in Florida

Answers

Answer:

5 INVASIVE SPECIES:

-Burmese Python

-Iguanas

-Cane toads

-Lionfish

-Feral Hogs

Hope this Helps!

According to biological classification, which of these pairs represents animals that are the MOST closely related? A) crabs and fish B) crabs and snakes C) crabs and penguins D) crabs and grasshoppers

Answers

Answer:

I think it will be crabs and fish

The idea that the brain of an infant is like a blank slate is known as: ____
a- tabula rasa
b-dry cup
c-cogito ergo sum
d-the empty brain

Answers

Answer:

a

Explanation:

The idea that the brain of an infant is like a blank slate is known as Tabula rasa. It is given in Locke's philosophy. Thus, the correct option is A.

What is Tabula rasa?

Tabula rasa is the theory which describes that individuals are born without a built-in mental content, and therefore all the knowledge comes from experience or perception in life. The epistemological proponents of the tabula rasa disagree with the doctrine of innatism, that holds the fact that the mind is born already in possession of certain knowledge eithout experience.

In Locke's philosophy, tabula rasa was the theory that at birth the infant mind is a blank slate without rules for processing data, and the data is added and rules for processing are formed solely by one's sensory experiences in life.

Therefore, the correct option is A.

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What role does cellular respiration play in the carbon cycle

Answers

Answer:It plays a vital role in the carbon cycle because it releasescarbon dioxide into the atmosphere.

Answer:

Hello, the cellular respiration is the process where organic sugar gets broken down to create and preform energy. It's very important because it releases the carbon dioxide from within our body and out into the atmosphere..

2. When two species compete for the same
resource, they sometimes divide this
resource. This is an example of
a. niche partitioning
b. niche equivalency
c. evolutionary response.
d. ecological equivalence​

Answers

Answer:

a

Explanation:

When two species compete for the same resource, they sometimes divide this resource. This is an example of niche partitioning. Hence, the correct option is A.

What is niche partitioning?

Niche partitioning refers to the process by which different species divide up available resources in an ecosystem, such as food, habitat, or mates. This division of resources reduces competition between species and allows them to coexist in the same ecosystem.

It can also occur in terms of behavior or timing of an activity. In general, it helps to reduce competition between species, allowing them to coexist and thrive in the same ecosystem. For example, same species of bats hunting on same type of insects will hunt in the different time of the day to reduce competition.

This allows for greater biodiversity and stability in an ecosystem. Hence, the correct option is A.

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bonjour pouvez-vous m'aider s'il vous plaît ça me ferait très plaisir la question est" à l'aide des documents montrer que le microbiote influence l'eczéma"​

Answers

I know that it odd. Cuz.

All natural resources are also either renewable or non-renewable. *
True
False

Answers

the answer would be true

How is the function of the mitochondrion important for the role of the ribosome in a eukaryotic cell?

A. The mitochondrion generates the ATP needed by the ribosome to produce carbohydrates

B. The mitochondrion generates the proteins needed by the ribosome to produce ATP

C. The mitochondrion generates the carbohydrates that provide the energy needed for the ribosome to produce ATP

D. The mitochondrion generates the ATP that provides the energy needed for the ribosome to produce proteins

Answers

Answer:

Mitochondrial ribosomes (mitoribosomes) perform protein synthesis inside mitochondria, the organelles responsible for energy conversion and adenosine triphosphate production in eukaryotic cells.

Explanation:

You are exposed to the same pathogen twice in your lifetime. Which of the following
is true?

A.) Your body will fight the second exposure much slower because it has already
used up all its antibodies against that antigen.

B.) The reaction times will be almost equal.

C.) You cannot be exposed to the same pathogen twice in your life because you
already destroyed those pathogens with your Killer T cells.

D.) Your body will fight the second exposure much quicker because it has stored
memory cells against that specific antigen.

Answers

Answer:

the answer would be D

Explanation:

Answer:

d

Explanation:

True or false: Invasive species are harmful in every single environment/ecosystem in the world.

Answers

Answer: the answer is yes

Explanation: in Florida we have multiple different invasive species which are destroying the environment.

True
Because the animal can be harmful to many other species in that ecosystem

Which statement is not true about chicken-pox?

Answers

Answer:

where is your statements

1. What is the atmosphere? *

1. It is another name for outer space
2. The first layer of the Earth's crust
3. A layer of gases that surround the Earth
4. The inner materials that make up the planet

2. Which of the following best describes the Earth's atmosphere? *

1. An empty space
2. A big blanket absorbing the Sun's heat
3. A thin towel that does very little to protect the Earth
4. A large cloud that generates the Earth's electromagnetic field

3. What is the ozone layer? *
( this was answered by a very helpful person but i included it to not add confusion )
1. The layer of the Earth below the crust
2. The layer of the atmosphere that we breathe
3. A portion of the Earth's atmosphere that protects the Earth from radiation
4. All of the above

4. In what layer of the Earth's atmosphere do planes usually fly? *

1. Thermosphere
2. Mesosphere
3. Stratosphere
4. Troposphere

5. What layer of the Earth's atmosphere is heated by the Sun hitting the ozone layer? *

Thermosphere
Mesosphere
Stratosphere
Troposphere

6. What layer of the Earth's atmosphere is the layer next to the Earth? *

1. Exosphere
2. Thermosphere
3. Mesosphere
4. Stratosphere
5. Troposphere

7. What layer of the Earth's atmosphere is the outermost layer and where the atmosphere is the thinnest? *

1. Exosphere
2. Thermosphere
3. Mesosphere
4. Stratosphere

8. What layer of the Earth's atmosphere can become very hot during the day and thought of as the start of outer space? *

1. Mesosphere
2. Troposphere
3. Thermosphere
4. Stratosphere

9. What layer of the Earth's atmosphere is where most meteors burn up upon entry? *

1. Exosphere
2. Troposphere
3. Stratosphere
4. Mesosphere

10. Why is it difficult to breathe at high altitudes? *

1. Because you are closer to the sun the higher you go.
2. Because atmospheric gases become thinner the higher you go.
3. Because there is more carbon dioxide the higher you go.
4. Because there is no oxygen in the troposphere.

Answers

Answer:

I HOPE THE ANSWERS ARE CORRECT JUST RECHECK

Explanation:

1-3

2-2

3-3

4-3

5-3

6-2

7-OUTERMOST=1

8-2

9-4

10-2 (ONLY NOT SURE ABOUT THIS)

(3) A layer of gases that surround the Earth.(2) A big blanket absorbing the Sun's heat.(3) A portion of the Earth's atmosphere that protects the Earth from radiation.(4) Troposphere(3) Stratosphere(5) Troposphere(1) Exosphere(3) Thermosphere(4) Mesosphere(2) Because atmospheric gases become thinner the higher you go.

Bacteria convert the nitrogen in the atmosphere into
a.Usable nitrogen
b.Non-usable nitrogen

Answers

Answer:

b. Usable nitrogen

Explanation:

Nitrogen is converted from atmospheric nitrogen (N2) into usable forms, such as NO2-, in a process known as fixation. The majority of nitrogen is fixed by bacteria, most of which are symbiotic with plants. Recently fixed ammonia is then converted to biologically useful forms by specialized bacteria.

Answer is B non-usable nitrogen

. Aşağıdaki şekilde hazırlanan tampon çözeltilerin pH'larını hesaplayınız? a) 8 mmol NaCH3COO+ 200 mL 0.1 M CH3COOH b) 100 mL 0.05 M NaOH+ 100 mL 0.175 CH3COOH c) 40.0 mL 0.12 M HCl +160 mL 0.0420 M NaCH3CO

Answers

Answer:

can u write this in english

Explanation:

Condensation is when water changes from a
A. gas to a liquid.

B. liquid to a gas.

Answers

the answer is A. Condensation is when a gas becomes a liquid. It happens when a gas, like water vapor, cools down. ... In condensation, matter changes from a gas to a liquid. All matter is made of tiny moving particles called molecules.

Answer:

ima say its A but if its wrong im srry

Explanation:

HELP DUE ASAP!! ILL GIVE POINTS AND BRAINLIEST

What effect does conventional agriculture have on biodiversity?

A) Biodiversity is decreased in cultivated fields
B) Biodiversity is increased in cultivated fields
C) species richness is increased in cultivated fields
D) relative abundance of species is increased in cultivated fields

Answers

The answer is going to be C

The effect conventional agriculture has on biodiversity is that biodiversity is diminished in cultivated fields.

How can biodiversity be affected by agriculture?

The loss of biodiversity for food and agriculture, as reported by most countries, is associated with changes in land and water use and management, followed by

PollutionOverexploitation and overexploitationClimate changePopulation growthand Urbanization.

With this information, we can conclude that the effect conventional agriculture has on biodiversity is that biodiversity is diminished in cultivated fields.

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The conference table top shown is the shape of two congruent trapezoids. The table top is wooden with a rectangular glass inset. All of the wood on the conference table needs to be refinished. What is the total area of the wood portion of the table top? Enter your answer in the box. The answer is not 20 4.3.2 Test (CST): Earth's Plates Question 4 of 6 The pale colors on the map show how likely it is that each area will experience a high-magnitude earthquake. The dark red and black dots show which areas have the highest human population densities. USGS B A Most likely C pls help PLEASE ANSWER I WILL GIVE BRAINLIEST Calculate the freezing point of a nonionizing antifreeze solution containing 388 g ethylene glycol, C2H6O2, and 510 g of water. Find the distance between the two points.(-1, -3), (1, 3)The distance between the two points isunits. is this correct help please I am probably really dum, but this is hard for me, so can someone help me pls??? (will give brainliest if u have good answers Help HELP HELP HELP PLS!!! Solve for .w7w=98Simplify your answer as much as possible. Sunscreen is a hot topic every summer. Dermatologists recommend wearing it every day to protect your skin from solar radiation. But skeptics say it can cause more harm than good by exposing you to dangerous chemicals and causing Vitamin D deficiency. There are two good reasons to wear sunscreen: to protect your health, and to protect your looks. Excessive exposure to sunlight can cause skin cancer. Over time, it also makes skin saggy and wrinkled. Numerous studies have shown that regular use of sunscreen reduces the occurrence of skin cancer, and also keeps skin smoother and more elastic. In contrast, there is little evidence that sunscreens currently on the market contain ingredients that are harmful when absorbed. It doesnt take much sunlight to produce all the Vitamin D needed for good health, either. Which of the options below is the most effective conclusion to the essay? Dermatologists recommend wearing sunscreen every day to protect your skin from the suns radiation, although some skeptics worry about exposure to dangerous chemicals and Vitamin D deficiency. Many studies have shown that regular use of sunscreen is good for you. There is little evidence it is harmful. In closing, the evidence for wearing sunscreen is clear and bright, while the arguments against it are partly cloudy at best. Use it every day, and your skin will look and be healthy. Walt Whitman said, Keep your face always toward the sunshine and shadows will fall behind you. Easy to for him say when he always wore a thick beard and big hat, but everyone else should either seek out those shadows or put on some sunscreen. Poetry can soothe your soul, but only sunscreen will protect your skin. Sunscreens work in two ways. Some use minerals to form a physical barrier that reflects radiation away from your skin. Others include chemical compounds that absorb the sunlight before your skin does. When used properly, both types of sunscreen can protect your skin from damage. x y1 132 153 174 195 21The table above represents what type of function? A. neither linear nor nonlinear B. linear C. linear and nonlinear D. nonlinear The distance from the tetherball pole is the edge of the circle is 5 feet. What is the circumference of the circle Plz help me with this question I dont understand it( the hint says most nations are a part of it) What happens to the pH of the solution as you add more substance to it? I WILL GIVE BRAINLIEST!Leaves blow in the wind, dance and spin Across the earth. tiny tornadoThis is an example of a(n) _______ poamA. AcrosticB. haikuC. limerickD. ballad How does an electric field change and influence its surroundings? Who is the most rebellious sinner Dante has seen in Hell? Why does Dante feel this way? Explain PLEASE HELP!!!The kid's meals at a fast food restaurant include one of three toys, selected at random. Each toy has an equal chance of being selected. Which simulation tool(s) could be used to find the experimental probability that it will take at least five kid's meals to collect all three toys?random number listdiecolored discscoin Which rational number corresponds to point A on the number line? Chesapeake Inc. acquired a registered trademark for $600,000. The trademark has a remaining legal life of 5 years but can be renewed every 10 years for a nominal fee. Chesapeake does not expect to renew the acquired trademark when the legal life is over. What amount of amortization expense should Chesapeake record for the trademark in the current year?a. $0b. $15,000c. $40,000d. $120,000