A) cyanobacteria
B) angiosperms
C) photosyntnetic bacteria
D) eukaryotic algae
Correct Answer: A
Solution :
: Cyanobacteria or blue green algae are photosynthetic prokaryotes which evolved 3 million years back. They perform oxygenic photosynthesis where they use water to get hydrogen and release oxygen in this process. Hence, they added oxygen to the atmosphere and paved the path of evolution of aerobic forms including aerobic bacteria.
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