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Verbal Reasoning
Verbal Reasoning
Very Hard
Which of the following statements is correct?
A
Photosynthesis is the only source of oxygen, with no contribution from abiotic processes.
B
Geological processes are the main source of free oxygen in the Earth's atmosphere.
C
The photolysis of water vapor is the exclusive cause of the accumulation of free oxygen in the atmosphere.
D
Although minor abiotic sources exist, ancient microbial life is responsible for the majority of the accumulated oxygen.
Select an option first
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