The atmosphere of early earth probably contained no\[{{O}_{2}}\]until – McqOptions

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1.	The atmosphere of early earth probably contained no\[{{O}_{2}}\]until the emergence of organisms that:
A.	Were chemoautotrophic.
B.	Were oxygen-respiring.
C.	Used hydrogen sulfide as a hydrogen source for photosynthesis.
D.	Used water as a hydrogen source for photosynthesis.
Answer» E.

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