(A) The aquatic fern $Azolla$ maintains a symbiotic relationship with the cyanobacterium $Anabaena$ $azollae$.This cyanobacterium resides in the leaf

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(A) The aquatic fern $Azolla$ maintains a symbiotic relationship with the cyanobacterium $Anabaena$ $azollae$.This cyanobacterium resides in the leaf cavities of $Azolla$ and is responsible for fixing atmospheric nitrogen.Therefore,$Azolla$ is the aquatic fern associated with nitrogen fixation.