Question

Life system: cyanobacteria begin photosynthesis and produce oxygen. Earth system: free oxygen reacts with rocks (axidation), resulting in increased rates of weathering for soil
production. Life system: land plants evolve and take root in terrestrial soil.
O Life system: cyanobacteria begin photosynthesis and produce oxygen. Earth system: free oxygen reacts with all available dissolved iron in the ocean. Life system: mass extinction
event of anaerobic organisms occurs from buildup of oxygen in the ocean.
• Earth system: oxygen moves from the ocean to the atmosphere through gas exchange. Earth system: free oxygen reacts with incoming solar radiation to form ozone. Earth system:
ozone collects in the stratosphere to form the protective ozone layer.
O Earth system: molten Earth forms into layers based on density and pull of gravity. Earth system: Earth cooled, and the water vapor in the atmosphere condensed and created the
oceans. Life system: cyanobacteria evolved.

Answer 1

The cyanobacteria were already there without the oxygen, so that rules out A, and a lot of prokaryotes were anaerobic, so that rules out  Finally, Photosynthesis does not require oxygen. Instead, Oxygen is a waste product of it.

What is photosynthesis?

Photosynthesis is a process that occurs in the chloroplast organelle of plant cells. The typical light reaction of photosynthesis takes place inside the thylakoid membrane of the chloroplast. The chief reactants such as water and carbon dioxide participate in the reaction. The water gets oxidized in the reaction to release oxygen as a product. The carbon dioxide gets reduced.

Thus, Photosynthesis is a process that occurs in the chloroplast organelle of plant cells

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