(B) Viruses are unique biological entities that contain either $DNA$ or $RNA$ as their genetic material,but never both. In contrast,all cellular organ

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(B) Viruses are unique biological entities that contain either $DNA$ or $RNA$ as their genetic material,but never both. In contrast,all cellular organisms like moss (plants),fungi,and lichens contain both $DNA$ and $RNA$ within their cells. Therefore,the correct answer is $B$ (Virus).