Which of the following is not a diatom?

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(A) Diatoms are members of the class $Bacillariophyceae$ within the kingdom $Protista$. They are photosynthetic algae characterized by a unique cell w

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$Nostoc$

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(A) Diatoms are members of the class $Bacillariophyceae$ within the kingdom $Protista$. They are photosynthetic algae characterized by a unique cell wall made of silica,known as a frustule. $Navicula$,$Cyclotella$,and $Pinnularia$ are all well-known genera of diatoms. $Nostoc$,on the other hand,is a genus of cyanobacteria (blue-green algae) belonging to the kingdom $Monera$. It is a prokaryotic organism capable of nitrogen fixation and is not a diatom.

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