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.
Answer:
bc geocentric is the sun revolving around the earth while heliocentric is the earth revolving around the sun
It’s so you can send a picture of a diagram or the question you need help on
Answer:
Earthquakes and volcanoes
Explanation:
Earthquakes are caused by any type of plate movement in response to the plates reacting to one another in some way.
Volcanoes can be caused when there is a plate being sucked under another plate causing magma to rise up and eventually errupt.
