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The prebiotic atmosphere of the earth wa...

The prebiotic atmosphere of the earth was of a reducing nature. It was transformed into a oxidising atmosphere of present day due to the emergence of

A

cyanobacteria

B

angiosperms

C

photosynthetic protists

D

eukaryotic algae.

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The correct Answer is:
A
The prebiotic atmosphere of the earth was of a reducing nature, i.e., no free oxygen was available. It was transformed into an oxidising atmosphere due to the emergence of cyanobacteria. They used water to get hydrogen and released oxygen into the atmosphere.
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