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:
I seen someone yelling doing the chicken dance around the room they were looking at the camera with the chicken mask it was the funniest thing I ever seen
Reason a is the correct one, as the european union has nothing to do with protection from invasions and Germany reunified many years ago.
A the southwest isnt an area that is fully populated yet due to the land layout and the weather and lack of jobs
