Which of the following statement is not correct about cyanobacteria? (a) The name cyanobacteria ...

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Which of the following statement is not correct about cyanobacteria?
(a) The name cyanobacteria was suggested by ICBN
(b) They were the first organisms that produced \( \mathrm{O}_{2} \) on earth.
(c) They have pigments for photosynthesis.
(d) They are not always of; blue green colour.
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