The answer is likely to be option E
After doing a lot of research on the answers to questions 40-42 on the Regents exam and studying the map you posted, the answer can be easily figured out.
It will take approximately 3 hours for the apparent position of the sun to change from point A on the map to point B on the map.
The correct answer choice will be number 3, 3 hours.
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.
