A) Autotrophs
B) Heterotrophs
C) Photoautotrophs
D) Chemotrophs
Correct Answer: C
Solution :
Cyanobacteria appeared in precambrian period around 3.2 billion years ago and were the first to have oxygenic photosynthesis to evolve \[{{O}_{2}}\] in photosynthesis that caused conversion of primitive reducing atmosphere to present day oxidising atmosphere (oxygen revolution).You need to login to perform this action.
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