What is the role of heterocysts in a cyanobacterial filament? (A) They carryout photosynthesis a...

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What is the role of heterocysts in a cyanobacterial filament?
(A) They carryout photosynthesis and nitrogen-fixation
(B) They carryout nitrogen fixation
(C) They carryout photosynthesis
(D) They oxidise inorganic substances to obtain energy
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