Question

why Cyanobacter is called
blue green algae?
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Answer 1

Answer:

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bcoz the photosynthetic and aquatic , so these are oftenly called as blue green algae

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Answer 2

Explanation:

Because they are photosynthetic and aquatic, cyanobacteria are often called "blue-green algae". This name is convenient for talking about organisms in the water that make their own food, but does not reflect any relationship between the cyanobacteria and other organisms called algae.