Which group of organisms is both CO_2-fixing | vedclass

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(A) Cyanobacteria such as $Anabaena$,$Nostoc$,and $Oscillatoria$ are photosynthetic,meaning they fix $CO_2$ into organic compounds.Additionally,these

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Anabaena,Nostoc,Oscillatoria

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(A) Cyanobacteria such as $Anabaena$,$Nostoc$,and $Oscillatoria$ are photosynthetic,meaning they fix $CO_2$ into organic compounds.Additionally,these organisms possess specialized cells called heterocysts (in $Anabaena$ and $Nostoc$) or have the enzymatic machinery to fix atmospheric nitrogen $(N_2)$ into ammonia.Therefore,these cyanobacteria are capable of both $CO_2$ fixation and $N_2$ fixation.$Azotobacter$ and $Azospirillum$ are free-living nitrogen-fixing bacteria but are not photosynthetic $CO_2$ fixers.

Which group of organisms is both $CO_2$-fixing and $N_2$-fixing?

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