1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
spin [16.1K]
3 years ago
11

Where did the original atmospheric oxygen come from

Geography
1 answer:
faust18 [17]3 years ago
3 0

The correct answer is - cyanobacteria.

The atmospheric oxygen came from the cyanobacteria. These were one of the earliest living organisms on Earth. The cyanobacteria was using photosynthesis in order to create its own food. The photosynthesis process requires sunlight, carbon dioxide, water, and oxygen. The oxygen is mostly released as a waste product from the process of photosynthesis, thus the cyanobacteria were literally releasing oxygen that was ending up into the atmosphere. As more and more cyanobacteria there were across the planet, more and more oxygen they were releasing into the atmosphere, slowly changing the composition of the atmosphere, and setting the basis of it as we know it now.

You might be interested in
why is it important to know the source of energy in convection currents to understand plate tectonic theory​
Lera25 [3.4K]

Its important to know the source of energy in convection currents because it is what drives the movement of the plates, formation of plate boundaries, and hot spots.

Explanation:

The convection currents are currents that occur in the mantle layer. The prime reason as to why they appear is the difference of heat and pressure between the upper and lower mantle. The energy itself exist because of the core of the Earth, as it is very hot and it has extremely high pressure, so it heavily influences the mantle layer above it.

The importance of understanding the energy source of convection currents is seen in that through it we can understand why we have plate boundaries at some places and not in others, why are spreading zones occurring, and why hot spots occur in the middle of the plates, far away from the boundaries. By understanding these things, we can understand the plate tectonics theory, thus the motion of the plates on Earth's surface.

Learn more about the plate tectonics theory brainly.com/question/3296749

#learnwithBrainly

4 0
3 years ago
When a bee moves pollen from a stamen to a pistil this process is called
SVEN [57.7K]
Pollination !! hope this helps
5 0
2 years ago
Examine the population chart of Niger. Based on this chart, Niger is in the __________ stage of Thompson’s Demographic Transitio
Lena [83]

I think it's B) Growth

9 0
3 years ago
Read 2 more answers
1. the moon is always half illuminated by....
miv72 [106K]
1) sun
2)high in the sky
3)bigger

Explanation: I hope this is correct but if not sorry
5 0
3 years ago
All of the following are middle-latitude climates except:
kogti [31]
The answer is dry tropical
5 0
3 years ago
Other questions:
  • What country lies directly north of China and separates it from Russia?
    12·1 answer
  • What was the purpose of the Federalist Papers?
    10·1 answer
  • Discuss three examples of volcanic eruptions in Indonesia and how they have changed world history
    9·1 answer
  • Which organism obtains its energy exclusively from dead or decaying matter?
    5·1 answer
  • What statement best describes the relationship between power and authority ?
    10·2 answers
  • Environmental geography bridges and geography
    9·1 answer
  • 2.1.0 Quiz
    9·1 answer
  • Deserts in China have been spreading because of the problem of deforestation. Which of the following deserts is growing in China
    14·1 answer
  • Help me, please <br> How will you end your proposal with the Pasteurization?
    13·2 answers
  • How does gross domestic product (GDP) differ from gross national income (GNI)?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!