A) \[{{O}_{2}}\]
B) \[{{N}_{3}}\]
C) \[{{H}_{2}}\]
D) \[C{{H}_{4}}\]
Correct Answer: A
Solution :
The primitive atmosphere of earth was reducing due to lack of \[{{O}_{2}}.\] The first photosynthetic organisms (cyanobacteria) evolved about 3300 to 3500 million years ago, began to release oxygen as by product of photosynthesis and converted the earths atmosphere into an oxidising.
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