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
How many bricks of dimension 7x14x28 cm3 will be sufficient to construct a cube of minimum size?
Wewaii [24]

It must be at least 4 bricks high because 6*4=24

2 bricks in each of the 4 levels of bricks (12*2= 24) (24*1=24)

4 bricks up*2 bricks wide= 8 bricks

5 0
3 years ago
Read 2 more answers
Explain scientifically how we know that Earth's crust is broken into pieces (plates). (explanations must be multiple sentences)
Mazyrski [523]

Answer and Explanation:

Earths crust is broken into plates called tectonic plates.  the plates move bc of  convection currents in the earths mantle.   convection currents are the movement caused with a liquid by the propencity of hotter and less dense matter to rise, and colder, thicker material to sink under the effect of gravitational pull, which as a result results in the transfer of heat.  As a result these are moved by the heat composed by the common natural blight of radioactive component in the earth.

8 0
3 years ago
Read 2 more answers
Using the symbols provided in the master legend of your atlas, which of the following Brazillan cities has the largest populatio
marissa [1.9K]

Answer:

I will tell you the answer if you promise you brainliest be ok

5 0
3 years ago
According to the U.S. Constitution, President Lincoln could abolish slavery.<br><br> True<br> False
Wittaler [7]
False. According to the U.S constitution, President Lincoln couldn't abolish slavery.

Hope this Helps!
4 0
3 years ago
Read 2 more answers
Why are winter days colder than summer days? The sun is up for less time in the winter. The sun is farther away in the winter. T
Alex17521 [72]

Many people believe that the temperature becomes lower in winters and higher in summers because the Earth is closer to the sun in summer and farther from the sun in winter. In fact, the Earth is farthest from the sun in July and is closest to the sun in January. The main reason behind these temperature changes in different seasons is because the earth's axis is tilted. It is all about the tilt of the Earth's axis.

3 0
3 years ago
Other questions:
  • Listed following are the different layers of the sun. rank these layers based on their distance from the sun’s center, from grea
    9·1 answer
  • How does human consumption of natural gases impact the environment?
    5·1 answer
  • What characteristics of the people of ancient Greece may be explained by the geography of the country?
    5·1 answer
  • Which countries are located on the malay peninsula
    12·1 answer
  • What mamal was domesticated 2,000 years ago and are currently hearded by the native people of northern asia
    5·2 answers
  • Why doesn't the international date line isn't in a straight line
    13·1 answer
  • If you were alive in the early 1800s which political party would you join
    9·1 answer
  • The bowl-shaped depression at the top of a volcano is a
    7·2 answers
  • Discuss China’s one child policy?
    5·1 answer
  • What is the type of geographical region of western Canada?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!