Which of the following are symbiotic prokaryo | vedclass

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(B) $1$. $Anabaena$ is a genus of filamentous cyanobacteria that exists as plankton. $2$. Some species of $Anabaena$ form symbiotic relationships with

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$Anabaena$

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(B) $1$. $Anabaena$ is a genus of filamentous cyanobacteria that exists as plankton. $2$. Some species of $Anabaena$ form symbiotic relationships with plants,such as the water fern $Azolla$. $3$. In this symbiotic association,$Anabaena$ fixes atmospheric nitrogen and provides it to the host plant,while receiving carbohydrates and a protected environment in return. $4$. $Spirogyra$ and $Cladophora$ are eukaryotic algae,and $Slime-molds$ are protists,not prokaryotic nitrogen fixers.

Which of the following are symbiotic prokaryotic organisms that fix atmospheric nitrogen?

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