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.
Correct Answer: D
Solution :
[d] Around 2.5 billion years ago, during the Precambrian, oxygen began to accumulate in the atmosphere due to the action of photosynthetic cyanobacteria.You need to login to perform this action.
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