Which of following are natural factors that can cause extinctions?


I. climate change

II. asteroid impacts

III. volcanic eruptions

IV. changes in oxygen levels in seawater

A.

I, II, III, and IV

B.

I, II, and III only

C.

II and III only

D.

I and IV only
i need help asap

Answers

Answer 1

Answer:

A is the answer. so it's correct


Related Questions

in predation, the animal that is hunted and eaten is the?

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Answer:

The answer is The Prey

Explanation:

Took a quiz

Answer:

prey

Explanation:

What is displacement of metals?

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Featured snippet from the web
Displacement reactions. Displacement reactions occur when a metal from the electrochemical series is mixed with the ions of a metal lower down in the electrochemical series. The atoms of the more reactive metal push their electrons on to ions of the less reactive metal. An example can be seen below.
It occurs when a metal from the electrochemical series is mixed with ions of a metal lower down in the electrochemical series.

When population grows past the ecosystem’s carrying capacity, what happens to the population?
A. Continues to grow
B. The population starts to die off to return to carrying capacity
C. The population will go extinct due to lack of resources
D. The population grows, then finds a new carrying capacity.

Answers

Answer:B animals will die since there arent enough resources for everyone until there is enough for the remaining population to  use

When Population growth past the ecosystem’s carrying capacity, then the population starts to die off to return to carrying capacity (Option B).

The carrying capacity refers to the maximum number of individuals of a population that can be supported by particular environmental conditions.

Carrying capacity depends on both biotic factors (e.g., presence of predators, food availability, etc.) and abiotic factors (e.g., water availability, living space, etc).

When a population passes its carrying capacity, then the environment becomes unsuitable for the individuals of that population to survive.

In conclusion, when population growth past the ecosystem’s carrying capacity, then the population starts to die off to return to carrying capacity (Option B).

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What are the key features of a tundra?

A. cold winter, thin acidic soil, evergreen trees

B. many evergreen trees, short moist summers, long snowy winters

C. long cool summers, short dark winters, migrating animals

D. treeless, permafrost, cold dark winters

Answers

Answer:

D. treeless, permafrost, cold dark winters

Explanation:

The correct answer would be D

Tundra is a habitat in which tree growth is hampered by cold temperatures and short growing seasons. Therefore, option (D) is correct.

What is a tundra?

The freezing temperatures and short growing seasons of a tundra biome make it difficult for trees to develop in this sort of ecosystem.



Most of the time, it is cold, but in the summer, it can get quite warm. The winters on the tundra are long, dark, and very cold. For six to ten months of the year, temperatures are below 0 degrees Celsius. Because the temperatures are so low, there is a layer of frost below the surface. This is a layer of frozen ground.

Arctic tundra is found above the Arctic Circle in Alaska, Canada, Russia, Greenland, Iceland, and Scandinavia, or in Antarctica. Alpine tundra are high on mountains where nightly temperatures are below freezing.

Therefore, option (D) is correct.

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What is the purpose of a trophic pyramid?

Answers

Explanation:

An ecological pyramid (also trophic pyramid, Eltonian pyramid, energy pyramid, or sometimes food pyramid) is a graphical representation designed to show the biomass or bioproductivity at each trophic level in a given ecosystem.

The movement of soil from one place to another place is called? ANSWER: GLACIATION, DEPLETION, or EROSION

Answers

Answer:

¿cual es la influencia que tiene la

15 POINTS The_____line of defense is referred to as the immune response

Answers

Answer:

The third line of defense is referred to as the immune response. This defense is specific to a particular pathogen, and it allows the immune system to “remember” the pathogen after the infection is over.

Explanation: in my best description, btw if its good make me brainliest?, if it didnt help im sry i tried my best

The term chemicals in this diagram represents

A. Starch molecules

B. DNA molecules

C. Hormone molecules

D. Receptor molecules

Answers

Answer:

C. hormone molecules

Explanation:

hormones are secreted in glands and are transported to the organs where they affect it and cause changes.

why are there no gram-positive archaea species but there are gram-positive bacteria species

Answers

Answer:

There are no gram-positive archaea because archaea lack peptidoglycan in their cell walls, meaning that the archaic cell walls are more similar to gram-negative bacterial walls, although they do show a greater variety of cell wall types. And bacteria do have this.

How do I compare and contrast these?

Answers

Difference : shape, bone structure, dont have the same amount of fingers

Same: they all mock eachother with having some type of fingers

The messages that scientists are sending into space are directed at intelligent alien life. Do
you think this is limiting? How could this affect scientists search for life beyond Earth?

Answers

Answer:

I think there is life beyond earth. Actually there most definently is. I think in  a way it could be limiting. It's the fcat that the ones out there may not even be able to receive the message as fast as we please. Who knows, it could be years, decades, maybe centuries before they make actual contact with us. Then again, maybe they already have. But, the way this could affect the study is the fact that (I doubt it) but maybe a message could be sent the wrong way, or they misinterpret it. That's the only think I can get off. Anyway, this can also depend on how much funding is going into space. This also brings up the question, "How much do we know about our own planet?

The actual exchange of gas occurs at the

Answers

Answer:

gas station, or butt

Explanation:

the gas station can fill your car and exchange gas with the pump. when you fart you exchange gas with the air.

Where is DNA located in your body?

Answers

Answer:

DNA is in the nucleus of nearly every cell in your body.

Explanation:

DNA is housed in the nucleus because it is the genetic material and needs to be protected.

Answer:

The DNA is located in the nucleus.

Explanation:

Humans and animals are EUKARYOTES which means we have a nucleus, where the DNA is stored. PROKARYOTES do not have a nucleus to the DNA is stored in the cytoplasm.

~Anna

True or False?

The least complex level of organization of the human body is a cell.

Answers

Answer: false

Explanation:

Answer:

TRUE

Explanation:

What are the body's levels of organization from least complex to most complex?

Cell, Tissue, organ, organ system

A. 25%
B. 50%
C. 75%
D. 100%

Answers

Answer:

B. 50%

Explanation2 of the offspring are heterozygous (Yy). 2/4 = 50%

Answer: 50%

Explanation:

which of the four DNA strands match the strand in the diagram by base pairing ?

Answers

Answer: I believe the answer you're looking for is Adenine goes with Thymine and Cystosine goes with Guanine.

Hope this helps!!

The four DNA strands that match the strand in the diagram by base pairing is GGTGACT. The correct option is A.

What is base pairing?

A base pair, which consists of two nucleobases joined by hydrogen bonds, is the basic building block of double-stranded nucleic acids.

They contribute to the folded shape of both DNA and RNA and serve as the building blocks of the DNA double helix.

base pair of DNA. The nitrogen-containing bases adenine (A), thymine (T), and cytosine (C), as well as guanine (G), couple together under normal conditions.

The structure of DNA is created by the binding of these base pairs.

In the given sequence, CCACTGA the base pairing can be done as GGTGACT.

Thus, the correct option is A.

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Your question seems incomplete, the missing image is:

HELPPPPPPP!!!!!!

An interglacial is a period of time that occurs between Ice Ages. During previous interglacials, the CO2 levels in the atmosphere were about 300 parts per million (ppm). In 2013, they were approximately 420 ppm. Rounding to the nearest percent, what is the percent increase in CO2 between these two time periods?

Answers

Answer:

40% increase

Explanation:

Percentage Increase Formula:

Percentage Increase=[(Final Value−Starting Value)/|Starting Value|] ×100%

To Calculate Percentage Increase:

   1) Subtract final value (later value) minus starting value (initial value)

  2) Divide that amount by the absolute value of the starting value (initial value)

  3) Multiply by 100 to get percent increase

Keep in mind: If the percentage is negative, it means there was a decrease and not an increase.

So for your problem,

[(420-300)/300]*100% = 40% increase

how is a food web different from a food chain

A. Food webs contains only producers not consumers
B. Food webs do not include decomposers
C. Food webs exist in aquatic environments food chains exist in terrestrial environments
D. Food webs contain many different linked food chains​

Answers

Answer:

D. Food webs contain many different linked food chains​

Explanation:

true or false aerobic cellular respiration produces more atp then anaerobic cellular respiration

Answers

Answer:

true

Explanation:

5 PLZ HELP 12points+
Select the correct answer.
If the population of rabbits in this ecosystem decreased dramatically because of certain environmental changes, which organisms’ food supply would decrease?

A.
owl and snake
B.
jackal and wildcat
C.
green plant and mouse
D.
goat and wildcat

Answers

Answer: B, the jackal and wildcat

ATP molecule What molecule(s) is produced by these activities?

Answers

Answer:

Glycolysis produces 2 ATP, 2 NADH, and 2 pyruvate molecules

Explanation:

Glycolysis produces 2 ATP, 2 NADH, and 2 pyruvate molecules

How can these artificial reefs protect biodiversity in the ocean ecosystem?

Answers

Answer:The reefs create a shelter for organisms and food

Explanation:Therefore it now created a more populated area for more animals or organisms to live.

Answer:

Plato

Explanation:

Many animals depend on corals for food and protection. By restoring the reefs using this method, they may be able to protect other populations of organisms from declining as well.

2. What are the two types of ecological succession?

Answers

Answer:

There are two main types of succession, primary and secondary. Primary succession is the series of community changes which occur on an entirely new habitat which has never been colonized before. For example, a newly quarried rock face or sand dunes.

Explanation:

Answer:

Ecological succession is a process of change in ecosystems that takes place over time, and that we can observe both in time and in space. ... There are two types, the primary sequence and the secondary sequence.

"I hope it helps you it was a pleasure to help you".

Explanation:

what forces cause surface ocean circulation? what forces cause deep water circulation?

Answers

Answer:

ANS 1) Ocean currents can be caused by wind, density differences in water masses caused by temperature and salinity variations, gravity, and events such as earthquakes or storms. Currents are cohesive streams of seawater that circulate through the ocean.

ANS 2)n the deep ocean, the predominant driving force is differences in density, caused by salinity and temperature variations (increasing salinity and lowering the temperature of a fluid both increase its density). There is often confusion over the components of the circulation that are wind and density driven.

HOPE IT HELPS : D PLEASE MARK ME BRAINLIEST

Explanation:

A. 25%
B. 50%
C. 75%
D. 100%

Answers

The Answer is A

Hope this helps

Select the correct answer.
Which of the following is the correct definition of a biography?
OA
an account of a fictitious experience that relies on figurative language
B.
an account of a single significant experience in a person's life
C.
an account of somebody's life written by that person
D.
an account of somebody's life written or produced by another person
Reset
Next

Answers

Answer:

D.

an account of somebody's life written or produced by another person

Arrange the tiles to show the sequence of events in the development of the theory of evolution.
Scientists examined evolutionary
relationships using DNA sequencing.
Scientists collected fossils that
showed species changing over time.
Mendel proposed laws for
how traits are inherited.
Darwin collected specimens
from around the world
during the HMS Beagle voyage.
Darwin proposed the theory of
evolution by natural selection.

Answers

Answer:

Explanation:

Here is the summary;

In 1817 his father collected later, in1828 Alexandre Brongniart's son (Scientists) collected fossils that showed species changing over time.

Between 1831–36 Darwin collected specimens from around the world during the HMS Beagle voyage

In 1859 Darwin proposed the theory of evolution by natural selection

Between (1856-1863), published in 1865 Mendel proposed laws for how traits are inherited.

Scientists examined evolutionary relationships using DNA sequencing.

What is respiration?

Answers

Answer:

B r e a t h i n g

EXPLAINATION????:

A process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances.

Answer:

Another word for taking a breath.

Explanation:

answer this question

Answers

technically its not even a question but idk. whats up?

Which best describes the different features or a plant life cycle

Answers

Answer:

The different features of the plant cycle can be based described as zygote is a diploid cell that is produced by fertilization. Explanation: zygote is formed due to the fusion of the female and male gamets. This is a type of sexual reproduction that takes place in plants.

Explanation:

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