Which of the following is/are diazotrophs?

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(D) Diazotrophs are organisms that can fix atmospheric nitrogen into a usable form such as ammonia. $Rhizobium$ and $Azotobacter$ are well-known nitro

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All of these

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(D) Diazotrophs are organisms that can fix atmospheric nitrogen into a usable form such as ammonia. $Rhizobium$ and $Azotobacter$ are well-known nitrogen-fixing bacteria. $Frankia$ and $Klebsiella$ also possess the ability to fix atmospheric nitrogen. $Anabaena$ and $Nostoc$ are cyanobacteria that fix nitrogen in specialized cells called heterocysts. Therefore,all the listed organisms are diazotrophs.

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