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B
Cyanobacteria
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C
Actinomycetes
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D
Archaebacteria
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Solution
The correct option is B Cyanobacteria Blue-green algae are also called as cyanobacteria. They are prokaryotes. They lack membrane-bound organelles like mitochondria, the Golgi apparatus. They lack a true nucleus as well. They are photosynthetic organisms. Some blue-green algae are nitrogen-fixing organisms.