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.You need to login to perform this action.
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